DEV Community: TanmayKumarDeo

Web App vs Mobile App: Types, Testing, and Tools

TanmayKumarDeo — Mon, 04 Mar 2024 07:56:53 +0000

In today’s dynamic business landscape, enterprises grapple with pivotal choices regarding their online presence.

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The strategic decision between adopting a web or mobile application has become critical for companies navigating the digital realm. With the global mobile app market experiencing unprecedented growth, as evidenced by a staggering 257 billion downloads in 2023, according to Statista, businesses must carefully weigh their options to harness the full potential of their online ventures.

On average, within three days of installation, an app experiences a 77% drop in its daily active user base. According to Forbes, there are 1.13 billion websites globally, but 82% are inactive. In light of these insights, we will delve deep into the key factors businesses should consider when choosing between web apps vs mobile apps.

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What is a Web Application?

A web application is a program that users can access through a web browser on any internet-connected device. Unlike traditional applications, web apps do not require separate installations on users’ devices. They are developed using web technologies such as HTML, CSS, and JavaScript. As a result, they are compatible with popular browsers like Chrome, Safari, and Firefox.

Examples of web apps include WhatsApp Web, Instagram, and Facebook, each offering a separate platform from their mobile app. These web apps enable users to connect, share content, and communicate with friends worldwide, enhancing global interaction and connectivity.

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Types of Web Applications

The four types of Web Applications are:-

Static Web Applications: A static web app consists of a user interface with static content that users cannot change through their actions. It is designed to load quickly, maintain stability, and ensure security. It’s great for showing consistent data without server-side processing or dynamic content.
Dynamic Web Applications: Dynamic Web Applications use server-side technologies like PHP, ASP.NET, Ruby on Rails, etc. They can communicate with users, retrieve data from databases, and change in response to input from the user. Dynamic websites suit applications like e-commerce sites, social media platforms, and content management systems.
Single-Page Applications (SPAs): A Single-Page Application (SPA) is like a super-smooth web experience. SPAs only get the necessary data from the server instead of reloading the whole website when we click something. It’s akin to possessing software on our PC but within our internet browser. Developers often use tools like React, Angular, or Vue to build these slick SPAs.
Multi-Page Applications (MPAs): Multi-Page Applications (MPAs) are like the classic websites we often visit. When we select an item, it causes a server request and reloads the entire page. This approach is great for websites like news or blogs, where every page is different and packed with content.

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What is a Mobile Application?

A mobile app is software designed for tablets and smartphones that users can download from app stores. Developers use languages such as Swift, Objective-C (for iOS), Java, and Kotlin (for Android) to develop these apps. They also have the option to utilize cross-platform frameworks such as React Native and Flutter.

Examples of mobile apps are Ola, Rapido, Uber, etc. They have a mobile app for booking rides, but there isn’t a dedicated web version for requesting rides directly from a browser.

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Types of Mobile Applications

The three types of Mobile Applications are:-

Mobile Web Apps: Mobile Web Apps are optimized and provide responsive website access through web browsers on mobile devices. They do not need installation and work across platforms. Web developers build them using web technologies like HTML, CSS, and JavaScript. Example: Web version of Netflix and Google Maps on mobile devices.
Native Mobile Apps: Native Mobile Apps are apps that users install directly on their iOS or Android devices. Developers build native mobile apps in a platform-specific language, such as Swift (for iOS) or Java (for Android). These are quick, responsive, and user-friendly, utilizing all the device’s features. Example: Splitwise and Snapchat mobile apps.
Hybrid Mobile Apps: A hybrid mobile app is a type of mobile application that combines elements of both web and native app development. It is built using web technologies such as HTML, CSS, and JavaScript, similar to a web app. These web technologies are encapsulated within a native app shell using frameworks like React Native or Flutter that allow it to be distributed and installed through app stores, just like a native app. Example: Twitter and Evernote mobile apps.

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Difference Between Web App vs Mobile App

We will see the difference between Web App vs Mobile App based on the factors listed.

Why is Testing of Web and Mobile Applications Important?

Testing Web and Mobile Applications is essential for several reasons:

Reliability and Stability: Testing Web and Mobile Apps helps identify and fix bugs, glitches, and errors that could lead to crashes or malfunctions. It also ensures the application works reliably and provides a stable user experience.
Optimizes Performance: Performance testing assesses the mobile and web application’s speed, responsiveness, and resource usage. This ensures it performs efficiently, even under high load or adverse network conditions.
Enhances User Experience: UI testing helps ensure the application is user-friendly, intuitive, and responsive. This contributes to a positive user experience, increasing user satisfaction and retention.
Verifies Functionality: Functional testing ensures that all features, buttons, forms, and functionalities in mobile and app applications work correctly. It also ensures that they meet user requirements and expectations.
Compatibility Assurance: Compatibility testing ensures the application functions correctly on different devices, browsers, and operating systems.

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Popular Frameworks for Conducting Web Application Testing

Some widely used tools or frameworks for conducting web application testing are:-

**Selenium: **Selenium is an open-source framework for automation testing. It provides tools to automate interactions with web elements, perform functional testing, and validate web applications. Selenium works with many programming languages (Java, Python, C#, Ruby, Kotlin, JavaScript) for testing on different platforms and browsers.

**Cypress:** Cypress is an open-source end-to-end testing framework designed for modern web applications. It enables developers and QA engineers to write and execute automated tests in JavaScript, ensuring the functionality and reliability of web applications.
**Playwright:** Playwright is an open-source automation framework for web browsers. It allows developers to write browser automation scripts in multiple programming languages like Java, C#, JavaScript, and Python. It supports Chromium, Firefox, and WebKit, enabling cross-browser testing with consistent APIs.

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Popular Frameworks for Conducting Mobile Application Testing

Some widely used tools or frameworks for conducting mobile application testing are:-

**Appium:** Appium is an open-source, cross-platform mobile automation framework that enables the automation of native, hybrid, and mobile web apps for both Android and iOS platforms. It provides a standard way to interact with mobile devices regardless of the operating system or platform.

**Espresso:** Espresso is an open-source UI testing framework for Android applications developed by Google. It excels in automating interactions with UI components like buttons, text fields, and more. It helps make reliable and easy-to-understand UI tests by offering synchronization features.

Calabash: Calabash is an open-source mobile testing framework that allows us to automate testing for native and hybrid mobile applications on Android and iOS platforms. It supports programming languages like Ruby, Java, Flex, and .NET. It allows native APIs to interact with app elements and supports testing on real devices and simulators/emulators.

**XCUITest:** XCUITest is a testing framework developed by Apple for automating the testing of iOS applications. It is specifically designed to interact with the user interface elements of iOS apps, allowing for comprehensive functional testing. It helps write test scripts in Swift or Objective-C, giving developers and QA engineers a strong tool for UI testing.

Selendroid: Selendroid is an open-source test automation framework designed for testing Android applications. It allows testers to interact with and automate the user interface of Android apps using Selenium WebDriver APIs. It supports both native and hybrid mobile applications for testing.

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Cloud Based Testing Solutions for Web and Mobile Applications

While frameworks like Selenium, Cypress, and Appium offer powerful testing capabilities, they come with their own set of challenges. Setting up and maintaining local testing environments can be time-consuming and resource-intensive. Additionally, ensuring compatibility across a wide range of devices, browsers, and operating systems requires significant effort and infrastructure. Cloud based testing platforms offer a streamlined solution to these challenges.

LambdaTest is an AI-powered test orchestration and execution platform that lets you run manual and automated tests at scale on over 3000 real devices, browsers, and OS combinations. With LambdaTest, scaling your testing infrastructure is as simple as a few clicks. Whether you need to run tests on a handful of devices or thousands, LambdaTest provides the necessary resources on-demand, eliminating the need for costly hardware investments and infrastructure management.

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Advantages of Cloud-Based Application Testing

Cloud-based web and mobile application testing is essential for several reasons:

Reduced Setup Time: Setting up a cloud testing environment is faster and easier than setting up a local test environment, which speeds up the testing process.
Backup and Recovery: Cloud platforms offer robust backup and recovery mechanisms. This ensures that we protect testing environments and data against unforeseen events.
Security and Compliance: Cloud providers invest heavily in security measures and compliance standards. This can provide a secure testing environment, often with features like encryption, access controls, and compliance certifications.
Global Testing: Cloud providers have data centers in different areas, allowing organizations to test performance and load from nearby locations. This helps in simulating real-world scenarios more accurately.
Cost-effective: Testing based on the cloud is economically efficient, removing the requirement for dedicated physical infrastructure. Organizations pay only for the resources they use, avoiding upfront hardware expenses. Additionally, cloud providers handle infrastructure upkeep, reducing maintenance costs.

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Conclusion

Understanding the differences between web app vs mobile app is essential to modern software development. We develop mobile applications for smartphones and tablets. Nonetheless, the web application is accessible on any gadget equipped with a web browser. To guarantee functionality, performance, and security, both require thorough testing.

Cloud-based testing solutions meet the changing needs of the digital world by being flexible and easily accessible. They assist in building great apps for various platforms and devices by offering a dependable testing framework.

Top 19 Benefits Of Automation Testing For Web And Mobile Apps In 2024

TanmayKumarDeo — Tue, 09 Jan 2024 07:25:40 +0000

With the increasing pace of technology, it becomes challenging for organizations to manage the quality of their web applications. Unfortunately, due to the limited time window in agile development and cost factors, testing often misses the attention it deserves.

Automation testing aims to enhance testing efficiency, precision, and speed. It automates repetitive manual testing tasks, allowing faster and more accurate results. Utilizing automated testing tools allows software applications to be tested swiftly and effectively, ensuring consistent performance and quality without continuous human oversight.

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Lack of proper testing leads to fewer quality products, delayed delivery, unsatisfied custom service, and increased costs. Such issues can be an unplanned test management strategy, delay in development, and underestimation of the effort of creating a test case.

The test engineers undoubtedly try to catch bugs or errors before releasing the product. However, bitter truth be told, you can’t catch every bug! So you deploy a quick fix post your migration to production, and then regression testing comes into play. Regression testing is very time-consuming but relevant to maintaining product stability. In such scenarios, you will find yourself stuck in a vicious cycle where your deployment window will grow narrow. How do we cope with such scenarios? The answer would be Automation testing!

Automation testing is here to stay in the long run! As per GM insights, the size of the automation testing market has reached USD 15 billion as of 2020. Moreover, the expected growth is at a CAGR of around 16% from 2021 to 2027.

In contrast to manual testing, automation testing is an effective way to improve the effectiveness and coverage of the testing process. It began to speed up execution cycles, exempt testers from repetitive tasks, reduce human efforts and provide instant feedback.

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In this article on the benefits of automation testing, we shall discuss what automation testing is and why automation testing is the right call for your software development life cycle (SDLC).

What is Automation Testing?

Automation testing refers to using automation tools and scripts to automate the execution of test cases in software development and quality assurance processes.

It involves writing scripts or test cases that can run automatically instead of requiring manual effort. The benefits of automation testing involve boosting the effectiveness and efficiency of testing by diminishing human mistakes, saving time, and enhancing test coverage.

Why is Automation Testing important?

Automation testing is important for the following reasons:

**Faster Execution:
**Automation Testing significantly speeds up the testing process compared to manual testing. Automated tests can run anytime, including nights and weekends, allowing for continuous testing and faster development cycles. Testers can save a significant amount of time required in repetitive testing like regression testing and smoke testing.
**Cost-Efficiency:
**While there’s an initial investment in setting up automated tests, the long-term benefits include reduced testing time and labor costs, making it a cost-effective approach in the long run.
**Consistency and Accuracy:
**Automated tests execute the same steps precisely every time they run, eliminating human errors and ensuring consistent and accurate testing results.
**Improved Test Coverage:
**Automation allows for executing complex test cases during every test run, providing broader test coverage and ensuring the software’s reliability and stability.
**Early Bug Detection:
**With automation, issues, and defects in the software can be identified early in the development process, making fixing them easier and less expensive.
**Reusability of Test Scripts:
**Automated test scripts are reusable and can be utilized through different phases of development, even if there are changes in the software’s user interface.
**Supports Agile and Continuous Integration:
**Automation Testing is essential for supporting Agile development practices and Continuous Integration/Continuous Deployment (CI/CD) pipelines, facilitating frequent and reliable software releases.

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19 Core Benefits of Automation Testing

The above section states the importance of automation testing, but there are tons of benefits of automation testing. Let’s explore the 19 core benefits of automation testing to eradicate the ambiguity on whether automation testing is the perfect choice for your organization.

1. Guarantees Higher Accuracy

Even the most conscious tester can make errors during monotonous manual testing. Automation testing completes the defined steps precisely every time they are executed but never fails to record detailed results. Hence, testers and developers freed from repetitious manual tests will have more time to create new automated test scripts and test the complex features. It is considered one of the most important benefits of automation testing.

2. Reduces testing cost and time

Undoubtedly, the initial cost and time investment for setup can be higher, but organizations save a lot of extra expenses with automation testing by utilizing resources effectively.

Manual testing cannot execute repetitive tests (like regression testing). As the software grows, additional features must be tested, increasing pressure and working hours for manual testers. The benefits of automation testing permit testers to not invest time in repetitive testing and hence can focus on more important tasks like designing new test cases and test scripts.

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3. Faster feedback loop

Getting feedback for newly created features can take time without test automation. Automation testing helps us reduce the feedback cycle and get faster validation at every step in the product’s development cycle.

It is especially useful because it helps us detect bugs and errors early during development, increasing the team’s efficiency. These key benefits of automation testing can be achieved using frameworks like Selenium, Cypress, Appium, etc. that accelerate test case execution.

4. Ability to perform Parallel testing

One of the most important benefits of automation testing is its ability to run multiple test cases in parallel. It is achieved through parallel testing.

Parallel Testing is a process that allows the execution of various tests simultaneously in multiple environments, browser configurations, and real device combinations. The primary goal of parallel testing is to decrease time and resource constraints. Unlike distributed testing, where different test components run in a distributed manner and interact with each other, the parallel testing approach is free from any such interaction.

This method is invaluable for effectively testing complex systems or large applications, as it minimizes testing time and optimizes resource utilization.

5. Provides cross browser testing

Manual cross browser testing may lead to numerous challenges and problems. In the case of manual testing, testers first need to identify the browser their web app must support. After preparing a checklist of all the browsers, they execute a single test on different browsers + versions + OS arrangements to measure how well their web apps perform.

Achieving sufficient test coverage may look like a nightmare if you have a wide audience to attend.

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Automated cross browser testing platforms like LambdaTest can reduce the struggles by running the same test cases multiple times on various browser configurations in parallel.

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6. Reusability of Test Scripts

One of the key benefits of automation testing is the ability to reuse the test scripts. Writing effective test cases demands a lot of time & effort, and repeatedly writing the same test cases can exhaust the testers. But, with automation testing, testers write a test script once and can reuse it as many times as they need.

Let’s look at an illustration of cross browser testing. When conducting cross-browser testing, testers might have to create test scripts each time to run the same application across various operating systems and hardware. Doesn’t that sound exhausting?

However, the automated test scripts are reusable; testers don’t always require new scripts, even if the OS or target device changes. With automated testing tools, test scripts can be reused as often as needed. This ultimately saves both the time and effort of the testers. This is one of the best benefits of automation testing we need to consider.

7. Maximize Test Coverage

Among the many benefits of automation testing, this one stands out. With automation testing, testers can execute a much larger number of test cases rapidly. More test cases ensure maximum test coverage of requirements and features in every test cycle.

Increased test coverage increases the possibility of determining bugs, which prevents avoidable issues and errors in production, and hence, the overall performance of the application increases.

With better test coverage, testers would be in a position to:

Understand more and less critical test cases for every application.
Get better traceability between the needed requirements and test cases generated so far.
Analyze the previous release and the current one.
Track every build cycle and project fixes.
Determine the EXIT criteria.
Improve the multitasking ability of every tester.

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8. Earlier bug detection

With automation testing, developers and testers can run unit tests on their local system before pushing code to the version control system. Subsequently, integration and regression testing are also run automatically. With this, every functionality and line of code is tested extensively. Hence, bugs are detected at an earlier stage.

Earlier bug detection leads to early and easier debugging before the actual production of the application. It increases the overall performance of the application on the production.

9. Shift-left testing done better!

One of the key benefits of automation testing is Shift-left testing. Shift-left testing is a part of continuous testing that conveys that the testing phase should be incorporated into the SDLC (Software Development Life Cycle), right from the requirement gathering phase to find bugs at an early stage. Shift-left testing can improve your product quality since it can let you:

Resolve bugs efficiently
Improve test coverage
Track everything on the go
Automate repetitive tasks
Improve the tester-developer relationship

The core benefits of automation testing include that it can be performed as soon as the development starts, thereby detecting the bugs or defects earlier, helping you shift left faster.
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10. Easy regression testing

Regression testing is performed for every new feature deployed in production to ensure the bug has been removed. Performing regression testing manually consumes a lot of time and is often repetitive. Automation testing is an ideal way to perform regression testing because:

In regression testing, test cases change very rarely. This same test script can be executed again and again.
Automated regression testing can be executed automatically on every new functionality release without requiring manual interventions.
In manual testing, testers may miss some steps, sometimes leading to less accurate results.

With automation testing, testers only need to put one-time effort into designing the test scripts to run regression testing. This is one of the core benefits of automation testing that saves the testers a lot of time and effort by reducing repetitive tasks. It also increases the test accuracy.

11. Better smoke testing

Smoke testing allows testers to evaluate if all important software functionalities work correctly quickly.

Regular smoke testing can help testers find critical failures and is recommended as a best practice. However, many organizations avoid it as they feel that doing so will squeeze the tester’s bandwidth. This is where automation testing comes into play. The best benefits of automation testing include evaluating the stability of a software build by running automated smoke testing for a successful build validation. The datasets required to perform smoke tests are rendered automatically, thus enabling the stability of software builds to be determined faster.

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These are the benefits of automated smoke testing:

Test easily
Improves the system quality
Identify defects in the early stages
Bring down the overall failure risk
Reduce integration risks

12. Accessible Data Driven Testing

Data driven testing is one of the critical benefits of automation testing. It permits testers to evaluate all functionalities that involve multiple data sets. To perform data driven testing we provide various data sets in multiple input fields of the software and test its accuracy.

With automation testing performing data driven becomes easy, as we can connect external data sources (like Excel files, CSV files, text files, XMLs, MS Access Tables, etc.) as the data set. Using our automated test script, we can store the result in the same or different file. This saves the testers time and effort by automatically taking inputs through the connected data source.

Advantages of Data-driven Testing:

Test any application with multiple data sets when performing regression testing.
Organize and store validation and test data in a single file and separate them from the test case logic.
Store test scripts under one repository.
Reduce the number of test cases and scripts.
No test script changes are required when changing test data.

13. Better analysis with a powerful test report

In manual testing, testers must report to each other manually to inform how many tests have been executed and what bugs have been found. The whole process is time-consuming and leads to reliance on each other.

On the other hand, automation testing engineers can track what other engineers have worked on, what test scripts have been executed, what tests others have performed, and what bugs were found and fixed with the help of clear and detailed test reports.

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14. Schedule 24 X 7 Test Execution

Compared to manual testing, the core benefits of test automation include the flexibility to run testing at any time of the day. In manual testing, human effort is needed; hence, executing tests 24 X 7 is impossible.

Automated testing allows testers to prepare automated test execution remotely at any time of the day. With automation testing tools, testers can even generate detailed reports on the scheduled test to analyze the software at any time of the day at their convenience.

15. Scalability

Even the largest manual testing teams in the world can’t match the test coverage, speed, and accuracy of an automation testing framework. For example, automation testing can be used to simulate a thousand visitors on the site for load testing. Unless the team has a thousand members to visit the website together (a completely unrealistic scenario), manual testing cannot achieve this.

Similarly, performing cross browser testing on multiple browsers + versions + OS configurations may not suffice. Automated testing can be used to make the testing scalable to a large extent.

With automation testing supporting parallel testing, testers can also run different tests simultaneously. This helps them test at scale and speed.

16. Maximize ROI

Faster tests with automated tests lead to faster results. This, in turn, reduces product release time without compromising the software quality. Accelerated production time maximizes a business’s Return on Investment (ROI).

These are the factors that may influence the automation testing ROI:

The license cost of the test automation tool.
The number of releases/builds in a single year.
Initial cost and time taken to manage automation framework setup, team reskilling, and feasibility.
The average number of automated test cases in every build.
Regression cycle and configuration of every build.
Salary of a test automation engineer.
Stability of the product.

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The benefits of automation testing can be best utilized by choosing a cloud-based automation testing platform like LambdaTest. It can maximize your return on investment to a large extent by reducing the burden of the initial setup. Also, it has a very user-friendly interface; thus, a testing team can use it without requiring much reskilling. Explore the pricing now!

17. Distributed Test Execution

Distributing test cases over multiple browsers, OSs, and devices is not feasible in manual testing. Instead, manual testers can only perform testing on a single device at a time to test the performance of an application.

Automation testing tools permit distributed test execution by running various tests simultaneously on different browsers, OSs, and devices.

18. Execute Complex and Lengthy Test Scenarios Effectively

Testing complex, error-prone, and lengthy test scenarios requires dozens of reproducible steps. Performing such tests manually may lead to a faulty result, even by distraction. However, the benefits of automation testing include executing such complex and lengthy test scenarios efficiently.

With automation testing, testers only need to develop a robust and reliable test script once. These test scripts are used by automation testing tools like Selenium, Appium, Cypress, etc. to ensure complex test efficiency.

19. Supports CI/CD Testing

CI/CD (Continuous Integration and Continuous Delivery) have become important practices for organizations to deliver high-quality software and stay competitive. CI/CD simplifies the software delivery process by automating integration and deployment of the product.

By leveraging the benefits of automation testing, testers can ensure the efficiency, effectiveness, and reliability of the entire CI/CD workflow. CI/CD encourages incorporating code changes numerous times throughout the day. Testers can schedule automated tests triggered after each integration and deployment, offering immediate feedback on probable bugs or issues.

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Automated tests act as a security net on every code change, ensuring that new components and features do not fail existing functionalities. Whenever a test fails, it starts an immediate examination, leading to immediate bug fixes and continuous advancement in the software’s quality.

Benefits of Cloud-Based Automation Testing

The benefits of automation testing are fine when running on various browsers on a local machine. However, cloud-based automation testing is necessary to leverage the full potential of automation testing and test your web and mobile app with numerous browser and platform combinations.

On a cloud-based platform like LambdaTest, Automated tests can leverage the cloud grid’s capabilities to run tests on multiple browser and platform combinations. The full potential of cross browser and parallel testing can only be achieved using a cloud-based grid. Such tests will help achieve great test coverage, thus ensuring more trust in their product.

To get started, you can create a free LambdaTest account. After creating an account, note your username & access key in the LambdaTest Password & Security Section for future reference. The LambdaTest Dashboard has the necessary information about the real-time sessions, tests, and logs and will indicate the status of the tests running. You can use the LambdaTest Capabilities Generator to generate the desired capabilities for the browser configuration on which you need to perform automated cross-browser testing.

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Conclusion

Automation testing could have more benefits as the industry is advancing immensely around automation. However, the above-presented points are the most critical benefits of automation testing, in my opinion. Feel free to share how automation testing has benefited your test cycles.

Also, remember that automation testing alone can’t always outperform manual testing. Hence, organizations are moving towards a hybrid testing environment to leverage the benefits of automated testing, like automated repetitive tasks, faster releases, reduced time for regression testing, cross browser testing, parallel testing, enhanced test coverage, and ensures 24×7 availability. These core benefits of automation testing give management, developers, and customers confidence.

Test Case Design Techniques for Smart Software Testing

TanmayKumarDeo — Thu, 28 Dec 2023 07:15:29 +0000

Test automation involves executing the test scripts automatically, handling test data, and using results to sweeten software quality. It’s like a quality checker for the whole team that helps ensure the software is perfect and bug-free. However, test automation is only valuable with suitable test case design techniques, as we will conduct test cases numerous times without catching the bugs in our software.

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Therefore, testers or developers must first figure out some practical and reliable Test Case Design Techniques for improving the quality of the software testing process. Selecting a good test case design technique helps us design better test cases faster.

In this article on test case design techniques, we will address the fundamental notion of all test case design techniques to make our software testing smart. We will also explore various examples of these techniques to uplift understanding of the topic.

Basics of Test Case Design Techniques

Test Cases are pre-defined sets of instructions handling the steps to be carried out to determine whether or not the end product flaunts the desired result. These instructions may retain predefined sets of conditions and inputs and their results. Test cases are the essential building blocks that, when put together, construct the testing phase. Designing these test cases can be time-consuming and may lead to some uncaught bugs if not appropriately designed.

Various test case design techniques help us design a robust and reliable test case that covers all our software’s features and functions. These design techniques implicate multiple measures that aim to guarantee the effectiveness of test cases in finding bugs or any other defects in the software.

Test case design requires a clever approach to identify missing necessities and faults without wasting time or resources. In other words, solid test case design techniques create reusable and concise tests over the application’s lifetime. These test case design techniques smoothen how test cases are written to provide the highest code coverage.

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Types of Test Case Design Techniques

The test case design techniques are classified into various types based on their use cases. This classification helps automation testers or developers determine the most effective techniques for their products. Generally, test case design techniques are separated into three main types.

**Specification-Based or Black-Box Techniques
**Specification-based testing, also known as black-box testing, is a technique that concentrates on testing the software system based on its functioning without any knowledge regarding the underlying code or structure. This technique is further classified as:
Boundary Value Analysis (BVA)
Equivalence Partitioning (EP)
Decision Table Testing
State Transition Diagrams
Use Case Testing
**Structure-Based or White-Box Techniques
**Structure-Based testing, or White-Box testing, is a test case design technique for testing that focuses on testing the internal architecture, components, or the actual code of the software system. It is further classified into five categories:
Statement Coverage
Decision Coverage
Condition Coverage
Multiple Condition Coverage Testing
All Path Coverage Testing
**Experience-Based techniques
**As the name suggests, Experience-Based testing is a technique for testing that requires actual human experience to design the test cases. The outcomes of this technique are highly dependent on the knowledge, skills, and expertise of the automation tester or developer involved. It is broadly classified into the following types:
Error Guessing
Exploratory Testing

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Specification-Based or Black-Box Techniques

Specification-based testing is a technique to test software such as Web apps, Mobile applications, and Desktop applications. It focuses on testing the features and functions of the software without needing to know the source code or structure. These test case design techniques are also known as Black-Box techniques.

The Specification-Based testing technique is an input/output-based testing technique because it considers the software as a black box with inputs and outputs. It provides some inputs to the software and then compares the outputs produced with the desired outputs.

This testing technique is widely used by automation testers and developers at all testing levels wherever any product specification exists. Because successful testing must ensure that the product is appropriately performing as it is supposed to be.

This technique is further classified into the following types:

Boundary Value Analysis (BVA)

It is usually observed that most software errors occur at the boundary values. The Boundary Value Analysis technique for designing test cases includes identifying test cases at the input domain’s boundary value.

In this technique, we design our test cases for the testing at or near the border values. Test cases often contain values from the upper boundary and the lower boundary. To make our task more manageable, BVA offers us four main test scenarios, as mentioned below.

Minimum
Just below the boundary values
Maximum
Just above the boundary values

Let’s understand this test case design technique by taking a simple example for a user age validation input form.

Test Name: Validate user age in the input form.

Test Condition: A valid adult user must be between [18 and 59 yrs], both inclusive.

Expected Behaviour: If the input age is not valid (i.e. age < 18 or age >=60), then the form must prompt a “To register, you must be between 18 yrs to 59 yrs.” alert.

Boundary Value Analysis: To ensure this functionality works, we can test the boundaries of the possible inputs. Possible valid inputs for this test are natural numbers between 18 to 59.

Hence, based on the four test scenarios for BVA, we can design test cases as — 18(Minimum), 17 (just below the minimum), 59(maximum), and 60(just above the maximum). Using these test cases, we can test that our app must prompt a “To register, you must be between 18 yrs to 59 yrs.” alert for 17 and 60 as inputs. Also, for the other two inputs, it must accept the age. If the expected behavior is obtained, we can say that the software is bug-free at boundary values.

The above example must have clarified the Boundary Value Analysis technique for test case design. Hence the designed test cases will be as follows:

Test Case 1: (Just Below Minimum)
Input: age = 17
Expected Output: “To register you must be between 18 yrs to 59 yrs.” alert popups.

Test Case 2: (Minimum)
Input: age = 18
Expected Output: Proceed to Registration.

Test Case 3: (Maximum)
Input: age = 59
Expected Output: Proceed to Registration.

Test Case 4: (Just Above Maximum)
Input: age = 60
Expected Output: “To register, you must be between 18 yrs to 59 yrs.” alert popups.

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Equivalence Partitioning (EP)

In the Equivalence Partitioning technique for testing, the entire range of input data is split into separate partitions. All imaginable test cases are assessed and divided into logical sets of data named classes. One random test value is selected from each class during test execution.

The notion behind this design technique is that a test case of a representative value of an individual class is equivalent to a test of any more value of the same class. It allows us to Identify invalid as well as valid equivalence classes.

Let’s understand this technique for designing test cases with an example. Here, we will cover the same example of validating the user age in the input form before registering. The test conditions and expected behavior of the testing will remain the same as in the last example. But now we will design our test cases based on the Equivalence Partitioning.

Test cases design Equivalence Partitioning:
To test the functionality of the user age from the input form (i.e., it must accept the age between 18 to 59, both inclusive; otherwise, produce an error alert), we will first find all the possible similar types of inputs to test and then place them into separate classes. In this case, we can divide our test cases into three groups or classes:

Age < 18 — Invalid — ( For e.g. 1, 2, 3, 4, …, up to 17).
18 <= Age <= 59 — Valid — ( For e.g. 18, 19, 20, …, upto 59).
Age > 59 — Invalid — (For e.g. 60, 61, 62, 63, …)

These designed test cases are too much for testing, aren’t they? But here lies the beauty of Equivalence testing. We have infinite test cases to pick, but we only need to test one value from each class. This reduces the number of tests we need to perform but increases our test coverage. So, we can perform these tests for a definite number only, and the test value will be picked randomly from each class and track the expected behavior for each input.

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Decision Table Testing

A Decision Table is a technique that demonstrates the relationship between the inputs provided, rules, output, and test conditions. In test case design techniques, this decision table is a very efficient way for complex test cases. The decision table allows automation testers or developers to inspect all credible combinations of conditions for testing. True(T) and False(F) values signify the criteria.

Decision table testing is a test case design technique that examines how the software responds to different input combinations. In this technique, various input combinations or test cases and the concurrent system behavior (or output) are tabulated to form a decision table. That’s why it is also known as a Cause/Effect table, as it captures both the cause and effect for enhanced test coverage.

Automation testers or developers mainly use this technique to make test cases for complex tasks that involve lots of conditions to be checked. To understand the Decision table testing technique better, let’s consider a real-world example to test an upload image feature in the software system.

Test Name: Test upload image form.

Test Condition: Upload option must upload image(JPEG) only and that too of size less than 1 Mb.

Expected Behaviour: If the input is not an image or not less than 1 Mb in size, then it must pop an “invalid Image size” alert; otherwise, it must accept the upload.

Test Cases using Decision Table Testing:

Based upon our testing conditions, we should test our software system for the following conditions:

The uploaded Image must be in JPEG format.
Image size must be less than 1 Mb.

If any of the conditions are not satisfied, the software system will display an “invalid input” alert, and if all requirements are met, the image will be correctly uploaded.
Now, let’s try to make the decision table to design the most suitable test cases.

Based on the above-formed decision table, we can develop 4 separate test cases to guarantee comprehensive coverage for all the necessary conditions.

State Transition Testing

State, Transition Diagram Testing, is a software testing technique used to check the transformation in the state of the application or software under changing input. The requirement of the input passed is varied, and the change in the state of the application is observed.

In test case design techniques, State Transition Testing is mainly carried out to monitor the behavior of the application or software for various input conditions passed in a sequential manner. In this type of testing, negative and positive input values are passed, and the behavior of the application or software is observed.

To perform State transition testing efficiently on complex systems, we take the help of the State transition diagram or State transition table. The state transition Diagram or state transition table mainly represents the relation between the change in input and the behavior of the application

State Transition Testing can only be performed where different system transitions are required to be tested. A great real-world example where State Transition Testing is performed can be an ATM machine.

Let’s understand this testing technique by considering an example of a mobile passcode verification system.

Test Name: Test the passcode verification system of a mobile to unlock it.

Expected Behavior: The Phone must unlock when the user enters a correct passcode otherwise, it will display an incorrect password message. Also, if 3 consecutive times an incorrect passcode is entered, the device will go on a cooling period for 60 sec to prevent a brute force attack.

State Transition Diagram:

In the state transition diagram, if the user enters the correct passcode in the first three attempts, he is transferred to the Device unlock state, but if he enters a wrong passcode, he is moved to the next try, and if he repeats the same for 3 consecutive times the device will go on a 60 sec colling period.

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Now we can use this diagram to analyze the relation between the input and its behavioral change. Henceforth, we can make the test cases to test our system (Mobile passcode verification system) properly.

State Transition Table:
Similar to the above state transition diagram, we can also design our test case using the state transition table. The state transition table for this particular example is as follows:

Use Case Testing

As the name suggests, in Use case testing, we design our test cases based on the use cases of the software or application depending on the business logic and end-user functionalities. It is a black box testing technique that helps us identify test cases that constitute part of the whole system on a transaction basis from beginning to end.

A use case testing technique serves the following objective:

Manages scope conditions related to the project.
Depicts different manners by which any user may interact with the system or software.
Visualizes the system architecture.
Permits to assess the potential risks and system reliances.
Communicates complex technical necessities to relevant stakeholders easily.

Let’s understand the Use case testing technique using our last example of a mobile passcode verification system. Before moving on to the test case, let’s first assess the use cases for this particular system for the user.

The user may unlock the device on his/her first try.
Someone may attempt to unlock the user’s device with the wrong passcode three consecutive times. Provide a cooling period in such a situation to avoid brute-force attacks.
The device must not accept a passcode when the cooling period is active.
The user should be able to unlock the device after the expiry of the cooling period by entering a correct passcode.

Now, analyzing these use cases can help us primarily design test cases for our system. These test cases can be either tested manually or automatically.

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Structure-Based or White Box Techniques

White Box Technique, also known as Structure-Based testing, is a testing technique that focuses on testing internal components or structures of software or applications. In this technique for testing, the tests interact with the code directly. The test cases are designed to confirm that the code works efficiently and correctly.

Among all test case design techniques, the white box testing technique becomes really important to check some points of the application like, security, reliability, scalability, etc., which otherwise can become difficult to test using other techniques. One of the primary advantages of white box testing is that it makes it possible to guarantee that every aspect of the software or application is tested. To achieve complete code coverage, white box testing uses the following techniques:

Statement Coverage

Statement Coverage testing is a technique for test case design that focuses on executing all the executable statements available in the source code at least once. It covers all the lines, statements, and paths of the source code for the software or application. Automation testers or developers generally use statement coverage testing to cover the following aspects of software testing:

To test the quality of the code written.
To decide the flow of various paths of the software or application.
To check if the source code’s expected performance is up to the mark or not.
Test the software’s internal code and infrastructure.

For statement coverage testing of the code, we calculate the statement coverage in percentage. Statement coverage value represents the percentage of total statements executed in the code.

Statement Coverage = (Number of statements executed/ Total number of statements in the code) * 100

To get a better understanding of software coverage let’s consider an example of a program code. Here we are considering an example of the OTP verification system. Given below is the Python code to validate the OTP input by the user by calling the isValidOTP method.

# Function to find the number of digits in a number.
def no_of_digit(num):
    digit = 0
    while num > 0:
        digit += 1
        num = num // 10
    return digit


# Function to accept OTP input
def accept_otp(otp):
    print("OTP accepted.")


# Function to validate OTP input provided
def is_valid_otp(otp):
    if no_of_digit(otp) == 4:
        # Length of OTP is okay to accept the input.
        accept_otp(otp)
    else:
        # Invalid length of OTP
        print("Invalid OTP. Try again.")


# Test the function with an example OTP
is_valid_otp(1234)

The above code basically tests if the OTP is of 4 characters or not. If it has more or less than 4 characters then it will print an invalid OTP; Otherwise, it will call the accept_otp() method. Now, let’s design our test case to check the statement coverage in different input situations.

Test Case 1: Value of OTP = 1234 (Valid 4-digit OTP).

In this test case, our code will execute all the statements except for line no: 13, 14, and 15. So we can calculate our statement coverage value as:

Statement coverage = (no. of statement executed/ total no. of statement) *100

Statement Coverage = (13/16) * 100

Statement Coverage = **81.25%**

Test Case 2: Value of OTP = 123 (Invalid non-4-digit OTP).

In this test case, our code will execute all the statements except any code inside the if condition i.e. only line 12. So we can calculate our statement coverage value as:

Statement coverage = (no. of statement executed/ total no. of statement) *100

Statement Coverage = (15/16) * 100

Statement Coverage = **93.75%**

Now considering both test cases one and two we can come to the conclusion that 100% Statement Coverage is reacted when we consider both a valid and invalid input. So, the statement coverage testing technique is majorly used to find the dead code, unused code, and unused branches. And considering these, we can design our test cases accordingly.

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Decision Coverage

Decision Testing Coverage is one of the test design techniques that checks all the branches in the code (like if/else, ?: conditionals, switch case, etc.) by executing every possible branch from every decision point at least once. This helps testers or developers to ensure that no branch of the code leads to any unexpected application behavior.

In simple words, if a program or code requires an input and uses a conditional like an “if/else”, or a ternary operator(“?:”), or a switch/case statement to perform single or multiple checks, decision testing coverage would help us in designing test cases such that all the possible outcomes can be tested to observe the behavior of the application in all scenarios.

To understand this test case design technique, let’s consider an example that involves multiple conditional statements. How about testing a program that checks if a number is a multiple of 2, 3, or 6?

Test Name: To test a program that checks if a number is a multiple of 2, 3, or 6.

Test Conditions: Inputs (test cases) will be given by the user, and the program produces an outcome.

Expected Behaviour: If the number is a multiple of 2, then the program must print that, otherwise if it is a multiple of 3, then the program prints that; but if it is a multiple of both 2 and 3, then the program must print that it is a multiple of 6.

Before testing, let’s see the code for this program in Python.

def find_multiple(num):
    # Check if the number is a multiple of 2.
    if num % 2 == 0:
        # Check if the number is a multiple of 3.
        if num % 3 == 0:
            # The number is a multiple of both 2 and 3.
            print(f"{num} is a multiple of 6.")
        else:
            # The number is a multiple of 2 only.
            print(f"{num} is a multiple of 2 only.")
    elif num % 3 == 0:
        # The number is a multiple of 3 only.
        print(f"{num} is a multiple of 3 only.")
    else:
        # The number is not a multiple of 2 or 3.
        print(f"{num} is not divisible by any given number.")


# Test the function with an example number
find_multiple(12)

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Decision Testing Coverage:

We can use the Decision Coverage value to measure if our code is executed completely or not. To find the Decision Coverage value, we can use the below method:

Decision Coverage = (No. of decision outcomes exercised / Total no. of decision outcome in the code) * 100

Now, let’s design our test cases to check the Decision Coverage in different input situations.

Test Case 1: Value of num = 8

In this test case, two decision outcomes are observed, first decision statement is if(num % 2 === 0), which produces a true outcome, and the second decision statement is if(num % 3 === 0) which produces a false outcome. No other decision outcome is covered in this particular test case. Also, the total number of possible decision outcomes is 6 (3 Decision conditional x 2 possible outcomes of each). Henceforth,

Decision Coverage = (2/6) * 100 %

Decision Coverage = 33.33%

Test Case 2: Value of num = 9

In this test case, two decision outcomes are covered, first decision statement is if(num % 2 === 0) which produces a false outcome, and the second decision statement is else if(num % 3 === 0) which produces a true outcome. Here Decision Coverage is,

Decision Coverage = (2/6) * 100 %

Decision Coverage = 33.33%

Test Case 3: Value of num = 12

In the third test case, two decision outcomes are covered, first decision statement is if(num % 2 === 0) which produces a false outcome, and the second decision statement is else if(num % 3 === 0) which also produces a false outcome. Now using this,

Decision Coverage = (2/6) * 100 %

Decision Coverage = 33.33%

Now, with all these 3 test cases, we can observe that our code has produced all the 6 outcomes, and hence that makes our total Decision Coverage to be 100%.

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Condition Coverage

Condition Coverage Testing, also known as expression coverage testing, is a technique used to test and assess all the conditional statements available in the code. The primary goal of condition coverage testing is to test individual outcomes for each logical expression or condition. It offers a satisfactory sensitivity to the code’s control flow. All the expressions with logical conditions are considered collectively in this coverage testing technique.

The formula to find the conditional coverage percentage is as follows.

Conditional Coverage = (Number of Executed Condition outcome/ Total number of Condition outcome) * 100

Note: In decision coverage, all conditions (if/else, switch/case, etc. statements) must be executed at least once. While in condition coverage, all possible outcomes of all expressions or conditions must be tested at least once.

Now, let’s cover a quick simple example to understand conditional coverage better and how to design the test cases. Here, we will consider an example to check if three lines of length (a,b,c) can form a valid triangle or not. The Python program for this example is written below.

def is_valid_triangle(a, b, c):
    # Check if all sides are greater than 0
    if a > 0 and b > 0 and c > 0:
        # Triangle Inequality Theorem: The sum of the lengths of any two 
        # sides must be greater than the length of the third side.
        if a + b > c and a + c > b and b + c > a:
            return True
    return False


# Get user input for the lengths of the sides
side_a = float(input("Enter the length of side 'a': "))
side_b = float(input("Enter the length of side 'b': "))
side_c = float(input("Enter the length of side 'c': "))


# Check if the sides can form a valid triangle
if is_valid_triangle(side_a, side_b, side_c):
    print("The given sides can form a valid triangle.")
else:
    print("The given sides cannot form a valid triangle.")

Now, let’s design our test cases to check if we can achieve 100% condition coverage using different input scenarios.

For the above program, we can have two separate conditions if a > 0 and b > 0 and c > 0 and if a + b > c and a + c > b and b + c > a. Both of these conditions can generate a True/False outcome individually. Hence we need to design our test case to get all these outcomes tested.

Test Case 1 (Condition 1-False, Condition 2-False)

Input: a = 0, b= 2, c= 3
Expected Output: The given sides cannot form a valid triangle.

Test Case 2 (Condition 1-True, Condition 2-True)
Input: a = 2, b= 2, c= 3
Expected Output: The given sides cannot form a valid triangle.

These two test cases were enough to generate a True/False outcome for both of the conditions, and therefore we will achieve 100% condition coverage.

By implementing these white box test case design techniques, automation testers or developers can ensure the software code is tested thoroughly and is free of unexpected behavior. Selecting the appropriate test case design techniques based on the project’s or software’s specific requirements is crucial.

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Multiple Condition Coverage

Multiple Condition Coverage is a test case design technique, that is mainly used to design test cases considering the fact that all the possible combinations of outcomes in a condition must be tested at least once. It offers more satisfactory sensitivity to the code’s control flow than decision coverage or condition coverage testing.

Multiple condition coverage is very similar to the Condition coverage but in Multiple condition coverage, we test all the possible combinations of the condition, while in Condition coverage, we test individual outcomes for each logical condition.

In Multiple condition coverage, we generate multiple test cases for each condition separately such that all the possible combinations of outcomes can be tested. The total number of test cases that can be generated for each condition using Multiple condition coverage is 2n ; where n is the number of logical sub-conditions or sub-expressions in the condition.

To understand this type of test case design technique, let’s consider the same example to check if three lines of length (a,b,c) can form a valid triangle or not. Here, we will first generate test cases for our first condition (i.e. if a > 0 and b > 0 and c > 0), that have three sub-expressions that can produce individual True/False outcomes. Hence we will be having 23 (= 8) combinations of the outcome (T/T/T, T/T/F, T/F/T, F/T/T, F/F/T, F/T/F, T/F/F, and F/F/F).

Test Case 1: (True, True, True)
Input: a = 1, b = 1, c = 1
Expected Output: The given sides can form a valid triangle.

Test Case 2: (True, True, False)
Input: a = 1, b = 1, c = 0
Expected Output: The given sides cannot form a valid triangle.

Test Case 3: (True, False, True)
Input: a = 1, b = 0, c = 1
Expected Output: The given sides cannot form a valid triangle.

Test Case 4: (False, True, True)
Input: a = 0, b = 1, c = 1
Expected Output: The given sides cannot form a valid triangle.

Test Case 5: (False, False, True)
Input: a = 0, b = 0, c = 1
Expected Output: The given sides cannot form a valid triangle.

Test Case 6: (False, True, False)
Input: a = 0, b = 1, c = 0
Expected Output: The given sides cannot form a valid triangle.

Test Case 7: (True, False, False)
Input: a = 1, b = 0, c = 0
Expected Output: The given sides cannot form a valid triangle.

Test Case 8: (False, False, False)
Input: a = 0, b = 0, c = 0
Expected Output: The given sides cannot form a valid triangle.

Similarly, we can design 8 more test cases for the second condition. Hence, this leads to a very large number of test cases for rigorous testing of the code’s control flow.

All Path Coverage Testing

All path coverage is a test case design technique that analyzes all of the codes’ pathways. This powerful strategy assures that all program routes or paths are tested at least once. This technique’s coverage is more effective and wider than multiple-condition coverage. Automation testers or developers often use this technique to design test cases for testing sophisticated and complex applications.

Now, Let’s take a quick example to understand this technique of designing test cases. For ease of understanding, we will cover a really simple example to test if a number is positive, negative, or zero. The code for this example in Python is as follows.

def check_number(n):
    if n > 0:
        return "Positive"
    elif n < 0:
        return "Negative"
    else:
        return "Zero"


# Input number to check
num = int(input("Enter the number to test: "))


# Print output
print(check_number(num))

Flow Chart for this code can be designed as:

Analyzing the above flow chart we can clearly see that there are three independent paths that can be formed i.e. 1 -> 2 -> 3 -> 4, 1 -> 2 -> 5 -> 6 -> 9, and 1 -> 2 -> 5 -> 7 -> 8. Hence we can design our test cases such that all these paths are traveled at least once.

Test Case 1
Input: num = 1
Expected Output: Positive
Path Taken: 1 -> 2 -> 3 -> 4

Test Case 2
Input: num = -1
Expected Output: Negative
Path Taken: 1 -> 2 -> 5 -> 6 -> 9

Test Case 3
Input: num = 0
Expected Output: Zero
Path Taken: 1 -> 2 -> 5 -> 7 -> 8

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Experience-Based Testing Techniques

Experience, skill, and instinct are the fundamentals for experience-based testing. In this testing technique, testers or developers are left free to design various test cases in advance or create them on the spot during the test implementation; mostly experienced testers will do a bit of both.

These techniques can be precious in looking out for test cases that are not easily identified by any other structured techniques. Depending on the approach, they may achieve varying degrees of effectiveness and coverage. This test case coverage can be difficult to examine and may not be measurable with structured techniques.

Some very commonly used experience-based testing techniques to design the test cases are as follows:

Error Guessing

Error Guessing is an experience-based test case design technique where automation testers or developers use his/her experience to guess the troublesome areas of the software or application. This approach necessarily requires a skilled and experienced tester.

Error guessing test case design technique proves to be very persuasive when used in addition to other structured testing techniques. This technique uncovers those errors that would otherwise be not likely to be out through structured testing. Hence, having the tester’s experience saves a lot of effort and time.

Now, let’s find out some of the guidelines to be followed for error guessing technique:

Always Remember earlier troubled areas: During any of the automation testing tasks, whenever you encounter an interesting bug, note it down for future reference.
Improve technical understanding: Knowing how the code is written & how error-prone concepts like null pointers, loops, arrays, exceptions, boundaries, indexes, etc., are implemented in the code helps in testing.
Do not just look for mistakes in the code but also find errors in design, requirements, build, usage, and testing.
Apprehend the system under test.
Consider historical data and test outcomes.

For example, error-guessing test case design techniques can pinpoint input validation situations, such as entering uncommon characters, long inputs, or unforeseen combinations of input values. Testers or developers can catch if the system controls such inputs gracefully or exhibits any unexpected behavior or vulnerabilities.

Exploratory Testing

Exploratory Testing is a type of test case design technique for software testing where automation testers or developers do not create test cases in advance but rather check the system in real-time. They usually note down ideas and opinions about what to test before test implementation. The primary focus of exploratory testing is mainly on testing as a “thinking” activity.

Exploratory Testing is widely used by testers in QA testing and is all about learning, discovery, and investigation. It highlights the personal responsibility and freedom of the individual tester.

For example, Exploratory testing for a user login feature involves testing beyond the basics. Testers would start by verifying standard login scenarios and then delve into boundary cases, such as incorrect credentials or excessive login attempts. They would assess features like social media integration, password recovery, and session management.

Exploratory testing would cover aspects like localization, accessibility, and cross-browser/device compatibility. By taking this approach, the testing team ensures a secure, user-friendly, and comprehensive login experience for the application’s users.

Bonus Point for Effective Test Case Design

Great test designs help us create applications with excellent customer experience. Following are some of the important points that can be considered while designing test cases.

Choose design technique wisely: Although we are equipped with multiple test case design techniques, we need not select all of those techniques but instead select a good combination of them based on our software requirements.
Define the scope and purpose of the testing: The first step in designing effective test cases is to pick the testable conditions. We must understand the testing goals as well as the features.
Domain expertise: Before designing test cases, we need domain knowledge, which is the basis of any software. This helps in designing test cases based on the software structure.
Assumptions should be avoided: When designing a test case, don’t make presumptions about the features and functioning of the software application. It may cause a disconnect between the client’s need and the product, affecting the business.
Look for any non-functional requirements: Non-functional requirements are just as influential as functional ones. Identify other non-functional testing requirements, such as operating system, hardware requirements, and security features to be handled.
Negative and positive test cases: When designing test cases, boundary value analysis, Equivalence class partitioning, and decision table testing are some test case design techniques that should be used. We should always think about negative testing, error handling, and failure situations, as these might help us find the most likely bugs in the code.

Conclusion

Writing effective test cases with all of the required details is an excellent job, and various test case design techniques can help us design them properly. In this article, we equip you with the notion of various test case design techniques, including structured and experienced testing techniques. We also included some bonus points to help you design test cases for smart software testing. Now, to conclude this article, we can say that successful usage of test case design techniques will generate test cases that guarantee the success of software testing.

Angular vs React vs Vue: Key Differences

TanmayKumarDeo — Fri, 15 Dec 2023 09:37:41 +0000

Developing a front-end infrastructure requires a lot of consideration, discussion, planning, management, and implementation. One of the first judgments we must make is choosing a front-end framework to build a product. Some front-end frameworks that have evolved as the most favored among web developers and causing the dilemma are Angular, ReactJS, and VueJS. It is evident from the StackOverflow Technical Survey 2023, which shows that 40.58% of developers prefer ReactJS, 17.46% of developers like to work with Angular, and 16.38% of developers love working on VueJS.

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All these three frameworks use JavaScript as the programming language and are often referred to as front-end JavaScript frameworks. The JavaScript framework we choose influences nearly everything: speed, scalability, SEO(Search Engine Optimization), development cost, compatibility with additional technologies like mobile apps, related software, etc. Therefore, this article will guide you in choosing the right framework between Angular vs React vs Vue.

What Is Angular?

Angular was first launched by Google in 2016 as a sequel to AngularJS, which was released in 2010. Angular is a fully-fledged front-end framework and platform for creating single-page web applications with the help of HTML and TypeScript. Angular is wholly written in TypeScript and is open-source and free. It implements optional and core functionality as a set of TypeScript libraries that we import into our applications.

Note: Many people confuse Angular with AngularJS, but the primary difference is that Angular uses TypeScript for development, while AngularJS uses JavaScript.

Various popular websites (like Gmail, Youtube, Upwork, Delta, Forbes, BMW Find a Dealer, etc.) use Angular as their front-end Framework due to its outstanding features.

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Features Of Angular

PWA (Progressive Web Applications) can be built using Angular. It provides an app-like experience to the users using its modern web capabilities.
Applications built over Angular load faster; moreover, Angular allows us to render the code into plain HTML & CSS.
Angular allows developers to produce high-end animations that enrich the user experience.
Angular has command-line tools that assist developers in building and testing a web application.
The in-built dependency injection of Angular streamlines application development.
The best thing about Angular is its frequent updates. It keeps improving its CDK (Component Development Kit) with version upgrades.
Testing Angular based web apps is very efficient because of the Jasmin framework.
Angular uses TypeScript, which provides more effective bug detection and thereby reduces overall development time.

What is React?

React (ReactJS or React.js) is a popular, open-source, and free front-end JavaScript library for developing user interfaces based on components. It was first released in May 2013. It is upheld and maintained by Meta (formerly Facebook) and a community of developers and companies.

React is used to develop single-page web apps, mobile applications, or server-rendered applications with frameworks like React Native or Next.js. Because React is only concerned with the user interface and rendering components to the DOM, React applications often rely on libraries for routing and other client-side functionality.

React is typically used to develop web apps that demand constant data updates on their UIs. Some popular websites using React as its development framework are Facebook, Instagram, Uber Eats, Salesforce, Dropbox, Airbnb, and many more.

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Features Of React JS

React uses the virtual DOM (Document Object Model) representation to render the entire UI when the web app or its data is changed. A virtual DOM is a DOM representation that forms a virtual replica of the actual DOM object.
Everything in ReactJS is treated as a component. These components are reusable, which helps developers in code maintenance and scalability when working on larger projects.
React utilizes a unidirectional data flow, pushing developers to update components via the callback feature rather than directly editing them. This highly increases the web app’s flexibility, leading to increased efficiency.
Everything in React is a component. This feature makes React code more user-friendly and readable, especially for bug fixes.
React provides end to end testing using popular tools like Cypress and Jest.
Codes written in React are easy to test, and because of unidirectional data flow, written code can not be accidentally altered down the road. This eradicates the need for regression testing throughout the life of our build.

What is Vue?

Vue (popularly known as Vue.js or VueJS) is an open-source, progressive front-end JavaScript framework that earned widespread popularity for building single-page applications. Vue.js was initially introduced in 2014 and quickly grabbed developers’ attention because of its easy learning curve and precise interface.

VueJS mixes the best of both Angular and React. It has bi-directional data binding like Angular and has code flexibility like React. Because of this, Vue is gaining popularity among top front-end JavaScript frameworks like Angular vs React vs Vue. Vue is primarily used when a high-performance, lightweight, intuitive web app is required. These applications quickly become ready for the market without compromising performance or functionalities.

Some big names in the market using Vue.js are Alibaba, Xiaomi, Adobe, Trivago, and many more.

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Features Of Vue JS

Vue.js uses virtual DOM, just like React.js. This feature is useful in optimizing and speed; it is less costly, and the changes can be done faster.
The bi-directional data binding feature enables Vue.js to assign or manipulate values to HTML attributes, update the style, and allocate classes with the help of a binding directive (v-bind) available with VueJS.
Vue.js has built-in directives, such as v-on, v-bind, v-show, v-if, v-else, and v-model, that handle events or perform various actions on the front-end.
Vue.js script is fast and high-performing and yet very lightweight.
Vue.js provides various ways to apply a transition to HTML elements when they are updated, added, or removed from the DOM. Vue has an in-built transition component that can be wrapped around the element for a transition effect.
There are a lot of plugins and tools available for performing unit testing on VueJS components, but the official website of Vue recommends only two tools: Vitest and Cypress.
Watchers are applied automatically to data that changes in Vue.js. For example, in a form input element, we need not add any additional event handler. Watcher manages any data modifications, making the code fast and straightforward.

Comparing Advantages and Disadvantages

Let’s compare their advantages and disadvantages. This comparison will help us understand which framework performs better in which conditions.

Advantages Of Angular

Angular is mainly used to create extensive and complex web apps that can be scalable because of its listed advantages.

Custom Components: Angular enables developers to create custom components that can be used to pack functionality and rendering logic, thus creating custom and reusable components. This makes the development faster and the web app more scalable.
Data Binding: Angular uses the two-way data binding. As the name indicates, two-way data binding is a mechanism where data flows from the view to the component and back. This data flow ensures that the view and the component are always in sync. Any modifications made on either end are instantly reflected on both.
This enables users to move data from code to the view effortlessly and respond to user actions without writing any code manually.
Dependency Injection: Angular uses a Dependency Injection or DI design pattern, which makes it incredibly efficient. This paradigm permits modules, classes, and components to be interdependent while preserving consistency. This improves the reusability and testability of the same services.
Testing: Angular utilizes the Jasmine testing framework that provides multiple functionalities such as fakes, spies, and pass-throughs to write test cases. Angular has been developed from scratch with testability in mind. Developers can test every part of their web application’s code, which is highly recommended.
Comprehensive: Angular is a full-fledged front-end framework that delivers out-of-the-box solutions like a built-in Dependency Injection system, HTTP Client, robust routing system, etc., for communication with the server, routing within our application, and more.
Cross Browser Compatibility: Angular is compatible with multiple browsers and platforms. An Angular web app can efficiently run on all browsers (e.g., Google Chrome, Mozilla Firefox, Apple’s Safari, Microsoft Edge, etc.) and OSes, such as Mac OS, Windows, and Linux.

*Learn how to implement CSS divce width for responsive design. Master the art of creating exceptional user experiences. How To Use CSS Breakpoints For Responsive Design. *

Disadvantages Of Angular

Angular comes with a lot of advantages, right? But it has a few disadvantages also. These disadvantages are mainly responsible for its lesser popularity than React JS. A few major disadvantages are as follows:

Steep Learning Curve: Angular comes with many concepts that all developers should know, such as components, directives, modules, decorators, services, dependency injection, templates, etc. Learning this complex framework can be difficult, especially for beginners. Additionally, developers must also learn TypeScript to use the framework.
Limited SEO Options: SEO is crucial for any business running on websites. SEO helps the search engine in finding your website on the web. Angular offers very limited SEO options and is hence often poorly accessible to search engine crawlers. To overcome this limitation, developers can use various external tools and libraries like Angular Universal for Server-Side Rendering, Ngx-seo library to manage meta tags, Scully to generate static HTML files to search engine crawlers, and NgOptimizedImage directive to optimize images.
Migration: Another reason why companies only sometimes use Angular is the hardship in porting legacy JS/jQuery based code to Angular-style architecture. Also, some new releases can be challenging to upgrade, and several are not backward-compatible.
Verbose and Complex: A common topic in the Angular community is its verbosity. This means significantly more code must be written to do even smaller tasks. It is also complex in comparison with other front-end frameworks.

Advantages Of React JS

React JS is mainly used to create single page web apps that mainly requires constant data updates on the UI based on API requests mainly. Let’s have a closer look at the advantages of React JS:

Declarative DOM: In React, the DOM is declarative. Developers can make interactive UI by updating the component’s state, and React handles updating the DOM according to the state. This implies that developers never interact with the DOM. Hence, it becomes easier to design interactive UI and debug them. Developers can change the program’s state and see how the UI will behave at that particular time in different scenarios. This makes the code easier to debug and predictable.
Faster Performance: React JS utilizes virtual DOM, which is a copy of real DOM. React uses an in-memory data structure cache to create the virtual DOM. Only the most recent changes are updated in the browser’s real DOM when any change is made in the program. This makes the web app built on React faster.
React Components: Everything in ReactJS is treated as a component. Developers can make and use their components in their web app for every functionality. These components are reusable, which helps developers in code maintenance and scalability when working on larger projects.
Cross Platform Compatibility: Code written in React can be used to develop web apps compatible with multiple browsers on almost all popular OS. The same code base can also be utilized to create an Android and IoS mobile app using React Native. This means the code is extensively reusable to build apps for various platforms.
Search Engine Friendly: Unlike Angular, React JS can be used to make web apps that are Search Engine friendly with relatively less effort. The Virtual DOM feature of React JS renders the web app more precise and yields the web app as a typical web page. This enables search bots to crawl through the React website and analyze the rank and relevance of the website on the search engine effortlessly.
Easy Learning Curve: The automatic rendering, component-based approach, and use of just simple JavaScript make React extremely easy to learn, create a web (and/or mobile apps), and maintain it. React mixes HTML and JavaScript concurrently to create a special syntax called JSX, which is relatively easier to learn and work with it.
Huge Community: React has huge community support, including the developer’s team and other engineers. This community greatly helps Developers in case of any issue.

*Learn the different methods to Chorme Inspect device of web elements on the Chrome browser. *

Disadvantages Of React JS

Although the advantages of React JS often hides its disadvantages but as a good developer we must know them in order to choose the perfect framework for our requirements. Listed below are few disadvantages of React JS:

Huge File Size: Generally, Web apps built on React JS have comparatively larger file sizes because of multiple module dependencies.
Third Party Library Dependency: React covers the UI components only and nothing else. Developers have to invest more time in setting up supportive tools. These include setting up integration and routers to create a fully-fledged web or mobile app. This makes React dependent on third-party libraries. These external libraries can provoke version clashes while scaling the application due to its dependencies.
Lack of Updated Documentation: React JS is developing at a speedy rate. Its huge open-source community always contributes new tools and dependencies for enhanced features and performance. This quickly outdates the documentation. Its reliance on other libraries like Redux, react-router, etc. affects its documentation’s lifecycle.

Advantages of Vue JS

Vue JS is a mix of the best features of both Angular and React JS. Hence Vue JS brings the following advantages:

Best of Both Worlds (Angular and React): Since Vue Js is greatly inspired by the two most popular front-end frameworks i.e. React and Angular, it combines the best features of both these frameworks and rejects their limitations. For instance, like React, Vue JS utilizes the Virtual DOM but it uses automated dependency management to automate component rendering when the state is changed, unlike React, where we have to use Hooks to render components on state change.
Also, Vue JS uses some Angular-like features, such as templating syntax, but without needing to learn a new language (i.e. TypeScript in the case of Angular).
Lightweight Apps: The apps built over Vue JS are very lightweight. A basic app built using Vue JS can be as low as 20kb in size. Sounds incredible right? It takes up no space on the disk, so the waiting time for it to download, install, and load significantly decreases.
Speed and High Performance: Web apps developed on top of Vue JS load exceptionally quickly, even on mobile devices because of its lightweight nature. However, this Vue JS lightweight feature does not impede the web app’s performance, resulting in a quick and effective web app.
No steep learning curve: Vue JS is very easy to learn and master. Beginners or anyone with some front-end development knowledge can conquer it within a few days. The only prerequisite to learning Vue JS is understanding the ‘big three’ web dev technologies: HTML, CSS, and JavaScript.
Component Based Architecture: One of the primary advantages of using Vue JS is that it has a single file component-based architecture utilizing HTML, CSS, and JavaScript. This makes the life of developers easy as every piece of code can be tested independently, and the coding is simple for developers to understand. Henceforth, this makes it easy to optimize and debug the application.
Integrates With Other Frameworks: Vue JS is very flexible when it comes to integrating it with various other frameworks like React or Angular. This greatly helps developers who are familiar with other frameworks and looking to adopt Vue JS for UI customization and speed enhancement.

*This tutorial focuses on Playwright visual testing, providing a reliable way to test web applications and ensure that they look and behave correctly across different browsers and platforms *

Disadvantages Of Vue JS

There is no ideal technology out there on the internet. Even the most promising technologies have certain disadvantages and so does Vue JS. In this section, the disadvantages of Vue JS are highlighted.

Lack of scalability: Vue JS lacks the scalability that allows for building gigantic complex web apps. This can be because the framework is still an indie project (i.e., an open-source project) not supported by any tech giants. Having stated that Vue JS is continually growing and enhancing, this is undoubtedly less probable in the future.
Small Community: Many enhancements and events are ongoing on the community side, though the community is frankly small and comprises many non-English (primarily Chinese) speakers.
Lack Of Plugins: Vue JS is not yet as established as its counterparts like Angular and React; hence, it has fewer developed plugins than the latter. This can be improved in the future because it has been only nine years since the framework’s launch.
Non-English Documentation: As Vue JS evolved in China, a large user base was also found there. Inevitably, many of the guides, user manuals, forum advice, etc., are in Chinese, and only some things have been translated. Tools like Google Translate come in very handy in such scenarios.

Comparing Core Features: Angular vs React vs Vue

With the completion of the previous section, we have achieved a milestone in understanding these three popular frameworks (i.e. React vs Angular vs Vue). Now is the time to compare the core functionalities of these frameworks. These core features will greatly help you find your perfect web development companion.

Architecture: Angular vs React vs Vue

The architecture of these frameworks significantly decides the web app’s speed, performance, scalability, and optimization. Hence, we will study and compare the architecture of all these frameworks individually.

Angular

Angular is a full-fledged MVC (Model View Controller) framework. It directs how the web app should be structured and offers bi-directional data flow with real DOM. The architecture of Angular includes the below eight fundamental components, all of which are connected.

Components
Templates
Ng Modules
Metadata
Data Binding
Directives
Services
Dependency Injection

This full-fledged MVC framework provides developers with all the prospects for out-of-the-box programming such as

Templates based on HTML;
Encapsulation of CSS components;
Components testing utilities;
Ajax requests; Routing;
Dependency injection;
Opportunities to create forms, etc.

*A quick guide on how to perform Cypress visual regression testing on a cloud Cypress grid like LambdaTest. *

React JS

React JS, on the other hand, is not a complete framework but a library that provides the view, leaving the developer to determine how to create the Model and Controller. React presents three simple concepts to make interactive web apps, as given below.

React elements: JavaScript replica of HTML DOM. React JS offers an API, React.createElement, for creating React Element.
JSX: React provides a JavaScript extension to design the UI known as JSX. It is an XML-based, extensible markup language that supports HTML syntax with slight modification. This JSX can be assembled into React Elements and used to construct the user interface.
React component: The React component is the basic building block of the React apps. It uses React elements and JSX to design the user interface.

Vue Js

Vue JS framework is based upon the MVVM (Model — View — ViewModel) architecture pattern that links the View ( i.e. User Interface ) and the Model ( i.e. Data Objects ). This architecture has the following components:

View: It is a Presentation layer that represents the structure of DOM. Vue JS instances handle the DOM. It operates as a template for the ViewModel layer.
Model: It is a business logic layer that contains plain JavaScript Data models or objects that become reactive when built by Vue JS instances. Thus, whenever objects change, the View also updates simultaneously.
View-Model: It is the layer responsible for transforming Model objects for state changes. The view layer responds to that property modifications and renders in DOM. It bridges the Model and View layers for creating a Vue instance with synchronized objects.

*A quick guide on how to perform Cypress visual testing on a cloud Cypress grid like LambdaTest. *

Data Binding : Angular vs React vs Vue

Angular JS uses bi-directional data binding. As the name indicates, two-way data binding is a mechanism where data flows from the view to the component and back. This data flow ensures that the view and the component are always in sync. Any modifications made on either end are instantly reflected on both.

React JS has one-way data binding. This unidirectional data flow pushes developers to update components via the callback feature rather than directly editing them. This highly increases the web app’s flexibility, leading to increased efficiency.

Vue JS supports both two-way binding and one-way binding, which is known as reactive two-way data binding. Depending on the input type, it automatically picks up the correct way to update the elements. In addition to that, Vue JS provides a data binding directive called v-bind that is used to manipulate or assign values to HTML attributes, change the style, and assign classes.

*This article sheds light on the best cross browser testing tools to look for in 2023. *

State Management: Angular vs React vs Vue

Angular provides its built-in state management library known as NgRx. This library is implemented using RxJS. NgRx provides several features for managing the state, including

A main storage that maintains all of the web app’s state
Actions that can be used to change the state
Reducers that can be used to update the state
Effects that are used to interact with external APIs

React does not have any built-in state management library. However, many third-party libraries are available, such as Redux and MobX. These libraries provide similar features to NgRx but are less tightly incorporated with React.

Just like Angular, Vue also has its state management library called Vuex. This state management library is similar to NgRx and Redux, but it is designed to be more lightweight and easier to use.

Scripting Language : Angular vs React vs Vue

Angular uses TypeScript programming language. Unlike JavaScript, TypeScript is a statically typed programming language, which means we must define the variable’s data type (number, string, character, array, etc.). This language would be more familiar for developers with an OOPs (object-oriented programming) background.

React mixes HTML and JavaScript concurrently to create a special syntax called JSX, which is relatively easier to learn and work with. This programming language enables React to use a component containing the logic and markup in the same file. React only demands the knowledge of JavaScript.

Vue JS uses plain HTML, CSS, and JavaScript individually. The template-based technique for Vue JS is precise, and new developers can easily grasp this programming style encouraged by Vue.

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How to Choose Your Best Companion for Web Dev?

The answer to this question can change depending on one’s use cases. So let’s explore the condition that best suits these frameworks.

Use Cases for Angular

Considering all the features, advantages, and limitations of Angular, we can decide when to use Angular. Some popular use cases are:

Angular is more useful in building larger and more complex projects.
Angular is a more suitable option for trustworthy scalability.
Angular is preferred in projects that require heavy animations.
Developers should use Angular if they have time to learn Typescript.

Use Cases for React JS

React JS is not a full-fledged framework but a library that can be used to build interactive UI. It is the most popular and preferred framework among React vs Angular vs Vue because of its advantages and features. The great ecosystem of React is primarily used in the following cases:

Projects that require lots of reusable custom components.
Projects that require a simple yet interactive front end.
Projects built on top of React JS have the highest level of scalability;
React can be used to build Projects quickly. Hence projects with short deadlines prefer React JS.

Use Cases for Vue JS

Vue JS is a lightweight framework mainly used to build single-page apps. This framework has gained much popularity in the past few years and is growing very fast among Vue vs React vs Angular. So, let’s explore the use cases where Vue JS rocks.

Vue is preferred when lightweight yet high-performance applications are required;
Projects can be built using Vue by beginners who only know HTML, CSS, and JavaScript.
Vue JS is only preferred in projects where scalability is not crucial.
Vue Js comes in handy in building projects that have the shortest deadline.

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What’s Next?

It is apparant from the comparison between Angular vs React vs Vue that all of them possess substantial utility and power. The choice of which framework to employ ultimately hinges on the developer’s objectives and the project’s specific business requirements.

Regardless of the selected framework — be it Angular, React or Vue — it is imperative to conduct thorough testing under actual user conditions to ensure a seamless end-user experience. This entails comprehensive assessments for cross browser compatibility and mobile friendliness across a spectrum of mobile and desktop devices and web browsers.

LambdaTest, an AI-powered test orchestration and execution platform that provides a comprehensive solution for testing web and mobile applications with over 3000+ real device browsers and OS combinations, ensuring quality and speed, be it Angular, React, or Vue.

Conclusion

In this article for choosing the best framework among Angular vs React vs Vue, we learned that every framework has advantages and disadvantages, which implies that the framework should be selected depending upon the use cases during product development. Angular, React and Vue are all going through very active expansion. They frequently release newer versions and support the existing ones. As the current support status is high in each case through their community, you can safely pick any of these frameworks.

What Are Layouts In Android?

TanmayKumarDeo — Wed, 13 Dec 2023 07:33:34 +0000

Mobile applications are increasing at a rapid rate. A report published on Statista shows that 255 Billion mobile apps were downloaded in 2022. With increased demand for mobile apps, the demand for mobile app developers is also growing.

Since Android is one of the market leaders in the operating system space for mobile, this blog aims to discuss “Layouts in Android”. By the end of this blog, you can build simple and complex Android screens by yourself. We will cover various Views and ViewGroups along with appropriate examples to help you understand Layouts in Android.

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What are Layouts in Android?

Layout refers to the arrangement of user interface (UI) elements on the Android app’s screen, like buttons, texts, images, etc.

Layouts in Android are primarily used to define the UI and widgets that appear on the screen of an Android app. These layouts are very crucial in Android apps as they act as the bridge between the user’s actions and the app’s logic. As soon as the user interacts with any layouts in Android (e.g., Buttons, ImageViews, EditTexts, etc. ), the Java/Kotlin program detects these interactions using pre-defined methods like OnClick, OnDoubleClick, etc.

Layouts in Android are usually defined in two primary ways:

Define UI elements in the respective layout XML file.
Create elements directly in the Java/Kotlin file dynamically.

Generally, defining layouts in the respective XML file is a good practice. It is an officially recommended method as it helps us keep the UI and app’s logic separate and hence enhances the app’s Scalability. Android Studio offers a design editor for XML files where we can preview our design and edit them by drag and drop option. When we open any XML layout file, the design editor opens by default. Hence in this article, we will primarily use XML files for Layouts in Android.

All elements in the layout are created using a hierarchy of View and ViewGroup objects. A View is used to create something the user can see and interact with. While a ViewGroup is an invisible container that contains and defines the layout structure for other View and ViewGroup objects. An example of such a hierarchy can be seen in the Image below.

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View Layouts in Android

The View is a base class for all the UI elements in Android apps, and it is used to build interactive UI components such as TextView, EditText, Button, Checkbox, RadioButton, ImageButton, ProgressBar, and ImageView. It is also responsible for creating dynamic or static elements on the screen and event handling for interaction with the user.

There are many View Layouts in Android, but listed below are some commonly used View layouts to build UI elements.

TextView Layout in Android

In Android, TextView is a user interface element used to display and set the static and dynamic text on the user screen based on our requirements. The TextView element acts like label control, and it doesn’t allow users to edit the text.

Create *TextView *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <TextView
       android:id="@+id/textView_id"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_margin="10dp"
       android:text="Welcome to LambdaTest"
       android:textColor="#000000"
       android:textSize="24sp"
       android:textStyle="bold" />


</LinearLayout>

If you observe the above code carefully, you can see that we have used some attributes in this TextView element. These attributes are used to define the design and style of the layouts in Android and hence are important. Some of these attributes are common and can be applied in almost all the View elements in Android, while some are View specific.

Some common attributes that apply to all the layouts are *id *(Used to assign a unique ID to the view which can be used later to access them, here ), *layout_width *(used to define the width of the view, here wrap_content means that width will be minimum to cover the whole content inside it), *layout_height *(used to define the height of the view), and *layout_margin *(used to leave margin on the view).

Attributes specific to TextView are text (used to define the text that will be shown on the UI), textColor (used to set the text color), textSize **(defines the font size of the text to display), and **textStyle (used to define the text style like bold or italic).

Emulator Output:

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EditText Layout in Android

EditText is a user interface element that allows the user to input and modify text/numbers through it. It is an extended version of the TextView element with few additional features and is used to let users enter input values.

Create *EditText *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <EditText
       android:id="@+id/edittext_id"
       android:layout_height="wrap_content"
       android:layout_width="match_parent"
       android:hint="Input Hint"
       android:inputType="text"/>


</LinearLayout>

Attributes used in the above code for EditText are as:

The hint attribute is used to set the hint text into the EditText field. This text will appear in the input box when it is empty.

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While using EditText control in our Android app, we must define the data type the text field can accept using the inputType attribute. For example, if our EditText should accept plain text, then we need to set the inputType attribute as “text”. In case it is used for a password, then we need to set the inputType as “textPassword”.

Emulator Output:

Button Layout in Android

The Button is a very crucial user interface element. It is used to perform an action whenever the user clicks or taps on it. Generally, Buttons in Android can contain text, icons, or both, or images and perform an action when the user touches it. Whenever the user clicks on any Button, the Button will call an on-click event.

Create a *Button *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <Button
       android:id="@+id/btnId"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="I am Button"
       android:onClick="btnOperation"/>


</LinearLayout>

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Attributes used in the above code for the Button are as:

The text attribute is used to set the text on the button. This text will appear on the button.

We can define the click event handler for the button by adding the onClick attribute to the < Button > object in our XML layout file.

Emulator Output:

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CheckBox Layout in Android

A CheckBox is a two-state button that can be either unchecked (OFF) or checked (ON) and it permits users to toggle between the two states (OFF/ON) based on the requirements. Generally, we can use multiple CheckBox elements in an Android app to let users select multiple options from the set of values. By default, the Android CheckBox is always in the Unchecked (OFF) state.

Create a *CheckBox *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <CheckBox
    android:id="@+id/chkBtnId"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:checked="true"
    android:text="LambaTest is Best" />


</LinearLayout>

The checked attribute is used to change the state of CheckBox to ON / OFF, if we need to set android:checked = “true” then our CheckBox will be in an ON state, while android:checked = “false” will set our CheckBox to OFF state.

Emulator Output:

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RadioButton Layout in Android

The RadioButton is also a two-state button that can have two states either unchecked or checked, just like the CheckBox element, except that it allows only one option to be selected from the group of options. In Android, the CheckBox element permits users to change the state of control to either unchecked or Checked, but the RadioButton can’t be unchecked once it is checked.

We can use RadioButtons inside a RadioGroup to combine various RadioButtons into one group, and it will make sure that users can select only one option from the group of multiple options.

Create *RadioButtons *inside RadioGroup in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <RadioGroup
       android:id="@+id/radioGroup"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="vertical">


       <!-- Radio Button 1  -->
       <RadioButton
           android:id="@+id/radioBtn1"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Option no 1"/>


       <!-- Radio Button 2  -->
       <RadioButton
           android:id="@+id/radioBtn2"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Option no 2"/>
   </RadioGroup>

</LinearLayout>

In the above code for RadioGroup layouts in Android, the orientation attribute is used to specify the direction in which RadioButtons inside it will align. It can have two values horizontal or vertical.

Emulator Output:

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ImageButton Layout in Android

The ImageButton is a user interface control element that is used to create buttons with an image and to trigger pre-specified action when a user taps or clicks on it. By default, an ImageButton looks the same as a normal Button, but the only difference between them is that we can add any custom image or icon to the button instead of plain text.

Create *ImageButton *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <ImageButton
       android:id="@+id/imgBtnId"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:src="@drawable/custom_image"
       android:onClick="buttonClickOperation"/>


</LinearLayout>

Here while specifying ImageButton layouts in Android, we must define the src attribute which is used to specify or indicate the source file of the Image to be displayed on the ImageButton. We pass the actual image file to the src attribute, generally stored in the drawable or asset directory of the Android project.

Emulator Output:

ProgressBar Layout in Android

The ProgressBar is the user interface element used to indicate users for any ongoing progress of an operation like fetching data, uploading, downloading a file, etc. Any app that runs any time-consuming progress must use ProgressBar to keep the users notified about the progress otherwise, users may think that the app is lagging and hence could quit the app.

Create *ProgressBar *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <ProgressBar
       android:id="@+id/progressBarId"
       style="?android:attr/progressBarStyleHorizontal"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:max="100"
       android:indeterminate="true"
       android:progress="50" />


</LinearLayout>

In the above code for creating ProgressBar, we used a few attributes that need to be understood to understand its behavior on UI.

The style attribute is mainly used to specify the layout design to be applied to the object. The value for this style attribute can be custom or system defined. Here we used ?*android:attr/progressBarStyleHorizontal* style which is specific to ProgressBar and it makes the ProgressBar horizontal, instead of the default style (circular).

The max attribute is used to define the maximum value for the ProgressBar. It must be an unsigned integer greater than equals to 1.

The progress attribute is used to set the progress completed at the instant. It can range from 0 to max.

The indeterminate attribute is used to enable/disable the indeterminate progress mode. By, default it has true value and is hence enabled. The Indeterminate progress mode in the ProgressBar is when we don’t know or specify how long a task will take or how much work has been done.

Emulator Output

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ImageView Layout in Android

The ImageView is a user interface control element that is used to display an image on the screen. While specifying ImageView layouts in Android, we must define the src attribute which is used to specify or indicate the source file of the Image to be displayed on the ImageButton.

Create *ImageView *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <ImageView
       android:id="@+id/imgViewId"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:src="@drawable/custom_image"/>


</LinearLayout>

Emulator Output:

ViewGroup Layouts in Android

The ViewGroup is a subclass of the View class and it acts as a base class for layouts and UI structure parameters. The ViewGroup provides us with an invisible container that can hold and arrange other Views and ViewGroups and define the main layout properties. For example, RelativeLayout is the ViewGroup that can contain other Views like Button, TextView, Images, other RelativeLayout, LinearLayout, etc.

Some common ViewGroup layouts in Android used to define the structure of screen UI are as follows:

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LinearLayout in Android

The LinearLayout is a ViewGroup subclass that is used to arrange all child View elements one by one in the form of a queue either in a Vertical or Horizontal direction based on the orientation attribute. A pictorial representation of LinearLayout in Android apps is shown in the image below.

The above image clearly represents that in LinearLayout, if the orientation specified is horizontal, then the LinearLayout will have only one row of multiple columns otherwise, if the orientation is vertical, then it will have one column of multiple rows.

Create LinearLayout in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <TextView
       android:id="@+id/textView1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textColor="@color/black"
       android:textSize="40dp"
       android:text="First TextView" />
   <TextView
       android:id="@+id/textView2"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textColor="@color/black"
       android:textSize="40dp"
       android:text="Second TextView" />


</LinearLayout>

The above code will arrange the two TextViews in the vertical direction hence textview1 will come first in the list and below it will be textview2.

Emulator Output:

RelativeLayout in Android

As the name suggests, RelativeLayout ViewGroup is used to arrange the position of child Views relative to each other or relative to the parent. For example, here, we can arrange child View A to the left of child View B, and we may arrange View B to align the bottom of the parent.

RelativeLayouts in Android is mainly used to design complex layouts where the position of child View elements depends on other View’s position. A simple pictorial representation of Views inside a RelativeLayout is shown in the image below.

To achieve these multiple types of alignment in RelativeLayout we specify attributes to the child elements that define their position. These attributes are listed in the table below. We can use these attributes to form complex UI layouts in Android. Let’s consider an example of creating RelativeLayout.

Create *RelativeLayout *in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">

   <!-- It will appear on the top left of the parent -->
   <TextView
       android:id="@+id/textView1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textColor="@color/black"
       android:textSize="40dp"
       android:text="Hello,"
       android:layout_alignParentTop="true"
       android:layout_alignParentStart="true"/>


   <!-- It will appear on the bottom left of the parent -->
   <TextView
       android:id="@+id/textView2"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textColor="@color/black"
       android:textSize="40dp"
       android:text="Relative Layout!"
       android:layout_below="@id/textView1"
       android:layout_alignParentStart="true"/>


   <!-- It will appear below textview2 but horizontally centered -->
   <Button
       android:id="@+id/button"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Click Me"
       android:layout_below="@id/textView2"
       android:layout_centerHorizontal="true"
       android:layout_marginTop="16dp"/>


   <!-- It will appear at the end of the parent layout  -->
   <ImageView
       android:id="@+id/imageView"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:src="@drawable/logo"
       android:layout_below="@id/button"
       android:layout_alignParentEnd="true"
       android:layout_marginTop="16dp"
       android:layout_marginEnd="16dp"/>


</RelativeLayout>

Emulator Output:

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TableLayout in Android

TableLayout is a ViewGroup element that is used to arrange its child ViewElements in the form of a table with rows and columns. It will position its child View elements into columns and rows and not create any border lines for columns, rows, or cells.

Create TableLayout in an XML layout file

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="16dp"
   tools:context=".ExampleActivity">


   <!-- Table Row 1 -->
   <TableRow>
       <!-- Table Cell 1 -->
       <TextView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Name:"
           android:paddingEnd="8dp" />


       <!-- Table Cell 2 -->
       <EditText
           android:id="@+id/editTextName"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           android:hint="Enter your name" />
   </TableRow>


   <!-- Table Row 2 -->
   <TableRow>
       <!-- Table Cell 1 -->
       <TextView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Email:"
           android:paddingEnd="8dp" />


       <!-- Table Cell 2 -->
       <EditText
           android:id="@+id/editTextEmail"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           android:hint="Enter your email" />
   </TableRow>


   <!-- Table Row 3 -->
   <TableRow>
       <!-- Table Cell 1 -->
       <Button
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:layout_span="2"
           android:text="Submit" />
   </TableRow>


</TableLayout>

Code Breakdown:

The TableLayout is the parent layout that will form the table inside it.

The TableRow View layouts in Android are used to define one row of the table. It contains table cells inside it.

In all the table cell elements, we used the layout_weight property, which specifies how much space is allocated to that View in the parent layout. This space is calculated based on the below formulae.

Space assigned to child = (child’s individual weight) / (sum of the weight of every child in parent layout)

In the Button of the last TableRow, we used the layout_span attribute which simply means that a number of the specified cells will be merged and hence the view will take the width of the complete merged cell. Here we assigned layout_span = “2”, which means that two cells will be merged in the row.

Emulator Output:

ListView in Android

ListView in Android is a ViewGroup element that is used to display a scrollable list of other View or ViewGroups in multiple rows. The list items are automatically inserted into the ListView using an adapter Class.

Generally, this adapter class pulls data from the database or API in the form of an array or list and converts each item into a result view that’s placed into the ListView. This is very useful in making Android apps that are dynamic and progressive.

Android Adapter

The adapter in Android acts as a bridge between the data sources (database or API) and adapter Views like ListView, and Gridview to fill the data into View elements. This adapter holds the data in the form of an array or list, iterates through items in the data set, and generates the View for each item in the list.

Create ListView in an XML layout file

<ListView
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Assign Adapter and Data to the *ListView*

// Create Data array
String[] users = { "JON DEO", "AHANA DEO", "Alavala Dasari",
                    "Pravala Seh", "Mady Sail", "Hamsi Yemieni"};


// Declare a reference to the ListView in layout file
ListView mListView = (ListView) findViewById(R.id.listView);


// Define an ArrayAdapter to hold and display the data in the list view
ArrayAdapter aAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, users);


// Set the defined ArrayAdapter to the ListView
mListView.setAdapter(aAdapter);

Code Breakdown:

The findViewById() method is used to link the UI element in the XML file with the Java/Kotlin Class or Activity.

The ArrayAdapter() constructor is used to create an adapter that will assign the value of the users list to the ListView.

The setAdapter() method is used to assign an adapter to the ListView.

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How to Design Complex Layouts in Android?

Now that we have learned about some commonly used View and ViewGrop layouts in Android, it’s time to design some complex UI in Android. This example will give us an actual understanding of how to use these layouts in combination and how to listen to user events on these UI elements.

In this article, we will try to clone the homepage of the LambdaTest website using various View and ViewGroup elements.

To proceed, let’s create an Android Project with no activity.

Next, we need to create an Empty View Activity with a layout file as shown in the image below. We will write our example in the layout file generated.

Before moving ahead please make sure you import all the necessary assets like logo images and icons into the Drawable resource director. Now let’s modify the activity layout file to write the code and achieve the desired design.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".ExampleActivity">


    <!--RelativeLayot for header bar-->
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp">
        <!-- Logo Image View-->
        <ImageView
            android:id="@+id/iv_logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/logo"/>
        <!-- Hamburgur menu button as Image Button-->
        <ImageButton
            android:id="@+id/ib_primary_menu"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/baseline_menu_24"
            android:background="null"
            android:layout_alignParentEnd="true"
            android:layout_centerVertical="true" />
    </RelativeLayout>


    <!--Primary heading as TextView -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:layout_marginTop="80dp"
        android:text="Next-Generation Mobile Apps and Cross Browser"
        android:textColor="@color/black"
        android:textFontWeight="500"
        style="@style/TextAppearance.MaterialComponents.Headline4" />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:text="Testing Cloud"
        android:textColor="@color/purple_700"
        android:textFontWeight="500"
        style="@style/TextAppearance.MaterialComponents.Headline4" />


    <!--Description Text -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:layout_marginTop="20dp"
        android:text="Deliver unparalleled digital experience with our next-gen
AI-powered testing cloud platform. Ensure exceptional user
experience across all devices and browsers."
        android:textColor="@android:color/darker_gray"
        android:textFontWeight="400"
        style="@style/TextAppearance.MaterialComponents.Body1" />


    <!-- Google Login Button design-->
    <Button
        android:id="@+id/googleLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:text="Start free with Google"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:backgroundTint="@color/black"
        android:drawableStart="@drawable/ic_android_black_24dp" />


    <!-- Email Login Button design-->
    <Button
        android:id="@+id/emailLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start free with Email"
        android:textAllCaps="false"
        android:textColor="@color/black"
        android:backgroundTint="@color/white" />


    <!--Trust Label Description Text -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:layout_marginTop="20dp"
        android:text="Trusted by 2M+ users globally"
        android:textColor="@android:color/darker_gray"
        android:textFontWeight="400"
        style="@style/TextAppearance.MaterialComponents.Body2" />


    <!--Company logo Grid Row 1-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">


        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/microsoft" />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/nvidia" />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/vimeo" />
    </LinearLayout>


    <!--Company logo Grid Row 2-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">


        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/telstra" />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/rubrik" />
    </LinearLayout>
</LinearLayout>

This code will produce a design that is very close to our desired design as shown in the image below.

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Conclusion

Layouts in Android are an essential component for UI interface design in Android apps. It provides ways for end users to interact with the application. This article covered the basics of View and ViewGroup elements in detail, along with their relative attributes. In the end, we successfully designed a complex layout in Android.

However, it is always important to test all these layouts in Android must be properly tested using testing tools like LambdaTest. It allows mobile UI testing on a variety of genuine devices, including different brands and several versions of Android OS on emulators.

Learn To Debug JavaScript Using Chrome Debugger

TanmayKumarDeo — Mon, 11 Dec 2023 09:00:56 +0000

For any front-end developer, finding and fixing errors in the code can be extremely difficult sometimes because of incoming unexpected data from the server and uncertain user interactions. Modern browsers have a JavaScript debugging tool to debug errors in the code.

Google Chrome, one of the most popular browsers, is still catching up in this feature and has one of the best JavaScript debugging tools called Chrome Debugger (also called Chrome Developer Tools). Developers can leverage this Chrome debugger to see what their JavaScript is doing in real time as they move around the screen. They can view console logs, set breakpoints, check variable values, inspect network-related activity, analyze and optimize memory usage, and audit certificated and website SEO.

This article seeks to clarify the process of using the Chrome debugger tool to debug JavaScript source code.

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What is Chrome Debugger?

Chrome Debugger, a JavaScript debugging tool enabled via the Chrome DevTools. It is a built-in suite of tools within the Chrome browser that offers a wide range of functionality for web development and debugging.

To enable the debugger, developers may use the following three methods:

The easiest one is using keyboard shortcuts i.e. Ctrl + Shift + J in Windows and cmd + Option + J in Mac.
Open the browser menu by clicking on the three dots in the upper right corner, scroll down to the “More tools” option, and select the “Developer tools” option.
Right-click on the web page to debug and click on the “Inspect” option.

As you can see in the above image, the Chrome debugger has nine panels. All these panels are responsible for different debugging tasks. Here is a quick summary of what each panel is mainly responsible for.

Elements: It can be used to inspect and edit DOM elements and style attributes.
Console: Mainly responsible for viewing logs and executing JavaScript code.
Sources: Used to debug JavaScript, edit JavaScript, add breakpoints, etc.
Network: Responsible for viewing and debugging network-related activities.
Performance: Used to analyze the speed and optimization of the web page.
Memory: Assists in tracking memory usage and fixing memory-related issues.
Application: It is used to inspect cookies, localStorage, sessionStorage, IndexDB, and any other local database.
Security: Used to debug certificates and other security problems.
Lighthouse: It audits the web app/website’s SEO, performance, quality, accessibility, etc.

Subsequently, we will focus primarily on the console and sources panel as they are responsible for debugging in JavaScript.

JavaScript Debugging with Chrome Debugger

Let’s look at some helpful JavaScript debugging strategies to debug JavaScript code more effectively and how to achieve that using the Chrome debugger.

The sources and the console panel are primarily responsible for JavaScript debugging using breakpoints and log statements. So let’s get started with the sources panel and understand how it works.

The Sources Panel

The *sources *panel is where developers can view source code or bundle output. It is the main panel we use for JavaScript debugging. Here we can view our source files to set up multiple breakpoints, watch variables, and perform the majority of debugging. It has a file tree that we can use to navigate through various files of the source code. We can open the *sources *panel by clicking the *sources *tab in the Chrome debugger.

As shown in the image above, the *Sources *panel has three primary components.

On the left we have the File Navigator pane, it lists a file tree of the source code including HTML, JavaScript, CSS, and other files, including assets that are attached to the page. Chrome extensions’ files may also appear here.
In the center, we have the Code Editor pane, which displays the source code for the file chosen from the File Navigator.
On the right we have the JavaScript Debugging pane, which is mainly for debugging the JavaScript code, we’ll explore it soon.

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The Console Panel

The *console *panel of the Chrome debugger is mainly used to write JavaScript programs and run them. We can also see the log output created by our website in this panel. To open the *console *panel, we can click on the *console *tab in the debugger.

In the image above, we can execute JavaScript statements. This comes in handy while debugging the JavaScript code.

How to Put Breakpoints in JavaScript using Chrome Debugger

We’ll examine a practical illustration of setting breakpoints in the source panel to debug JavaScript. So let’s first look at an example webpage with a bug before continuing with the debugging. Here, we’ll look at an illustration of a simple interest-based loan amount calculator.

Given below is the HTML/CSS and JS code for the simple interest loan calculator.

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Simple Interest Loan Calculator</title>
    <link rel="stylesheet" type="text/css" href="styles.css" />
  </head>
  <body>
    <div class="container">
      <h2>Simple Interest Loan Calculator</h2>
      <label for="principal">Loan Amount ($):</label>
      <input
        type="number"
        id="principal"
        placeholder="Enter loan amount"
        min="0"
      />

      <label for="rate">Interest Rate (% per year):</label>
      <input
        type="number"
        id="rate"
        placeholder="Enter interest rate"
        min="0"
      />

      <label for="time">Loan Period (years):</label>
      <input type="number" id="time" placeholder="Enter loan period" min="0" />

      <button onclick="calculateLoan()">Calculate</button>
      <div id="result"></div>
    </div>
    <script src="script.js"></script>
  </body>
</html>



/* CSS Styles */
body {
    font-family: Arial, sans-serif;
}

.container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

label {
    display: block;
    margin-bottom: 5px;
}

input[type="number"] {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 3px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #007BFF;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 20px;
    font-weight: bold;
}

// JavaScript function to calculate the loan amount
function calculateLoan() {
  // Get values from input fields
  const principal = parseFloat(document.getElementById("principal").value);
  const rate = parseFloat(document.getElementById("rate").value);
  const time = parseFloat(document.getElementById("time").value);

  // Calculate the interest and total amount to be repaid
  // Intentional Bug
  const interest = (principal + rate + time) / 100;
  const totalAmount = principal + interest;

  // Display the result
  document.getElementById(
    "result"
  ).innerHTML = `Total Amount to be Repaid: $${totalAmount.toFixed(2)}`;
}

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For the image shown above, with input values — principal = $100, rate of interest = 10%, and time = 1 year, the calculator produces $101.11, which is a wrong answer and must show $110 instead.

This implies that our JavaScript code for calculating loan amounts has a bug. Let’s try to fix this issue using the Chrome debugger. For proper JavaScript debugging, we can follow the below steps:

Step 1: Produce the Bug

The first and foremost step in JavaScript debugging is to perform some operations and produce the bug that we need to fix. We already completed this step with the data shown above.

Step 2: Add BreakPoints

A breakpoint is an intended stopping point in our code’s execution. This is the point in a code’s execution where the developer intends to pause the code and inspect the content of the related variables and other properties.

In our example of the loan calculator, it is evident that the calculated loan amount becomes inaccurate after clicking the **Calculate **button. Therefore, we need to check if the JavaScript code is calculating correctly.

To do this, we must set a breakpoint before the code calculates the loan amount. Doing this will help us analyze the values of all specified variables up to the fixed breakpoint.

There are several types of breakpoints we can set in our code. Let’s take a quick look at them:

Line-of-code — When we need our code to pause on an exact point in our code.
Conditional — This is useful when code should pause on an exact point in our code but only if a defined condition evaluates to true.
*DOM *— It pauses the program at a point in a code block that alters a specific DOM node.
Event Listener -It is used to pause the program at a point in a code block that executes after an event is triggered.
*Function *— It pauses the program whenever a function is called.

Now that we have clearly understood the breakpoints, let’s get a hands-on experience by using it in our example to debug the code. Here, we are going to use a “line-of-code” breakpoint and set it at line number 11. Follow the steps to do so:

Open Chrome Debugger and go to the Sources tab
Go to the File Navigator pane and choose script.js to open the code inside it in the code editor pane.
Within the code editor, select line number 11 by clicking right on the number digit, not on the line containing the code. This will add a breakpoint at line number 11 which is responsible for the final loan amount calculation.

To activate the JavaScript debugging, we can execute the code again by providing inputs on the web page and then clicking on the **Calculate **button. The Chrome debugger will pause the code’s execution and highlight the 11th line (where the breakpoint was set). This will also show the value of variables in the code till line 11.

The above image clearly depicts how the breakpoint paused the execution and listed all the variables with their values in the **Local **option inside the **Scope **window. Now we can analyze these variables to find the actual issue and fix that.

*Do you use a Mac and want to run the test in Internet Explorer? This article explores how to test Internet Explorer on Mac. *

Step 3: Analyze the Variables

Chrome debugger provides us with tools that help in analyzing the state of our code and variable values on any line as we step breakpoint through it.

Watch: Using the Watch window, we can specify a variable (or expression) we want to monitor. We can add the variable or expression by clicking the plus sign +.
Call Stack: The Call Stack window shows a set of methods and functions executed during our code’s execution.
Scope: This is the window where we can view and edit values of variables and properties in the local and global scope. This is very useful in fixing issues where multiple data and variables are involved.

In our example, we will analyze the local variables and check for the actual issue that leads to an incorrect loan amount calculation. On observing carefully, we can see that the interest is calculated wrongly i.e. its current value is 1.11 instead of 10.

On diving deeper, we can clearly visualize that the root cause for this problem lies in the way this interest has been calculated. The formula used here is incorrect ( i.e. here the principal, rate, and time are added instead of being multiplied ).

Step 4: Fixing the Bug

Now that we have successfully identified the bug it’s time to fix that by correcting the typo mistake. Obviously, we can do this by editing the code and then re-running the code, but with Chrome debugger, we don’t even need to leave the browser to apply the fix. Here are the instructions we can follow to edit our JavaScript code directly inside the Chrome debugger interface.

Since we are still in debugging mode, first click the Resume execution button (▶️) to exit debugging mode.
Now, in the Code Editor, replace all the + symbols with the * symbol in line 10.
Press CTRL + S (Windows) or CMD +S (Mac) to save the changes.
Click the line number 11 again delete the breakpoint before running the code.

Now on clicking the “Calculate” button again, we get the correct loan amount calculated i.e 110.

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How to Debug JavaScript using console.log

An efficient technique for resolving web page glitches involves employing the console.log() function within your code. This nifty tool permits real-time examination of variable values through the Chrome debugger’s console panel.

While this method enjoys popularity, it occasionally lacks the depth required for intricate issues. It thrives in scenarios with a limited variable count or stable values but may not suffice for dynamic and numerous variables. In such instances, the Chrome debugger emerges as the preferred, more effective debugging solution.

Some Common Challenges of JavaScript and its Solutions

JavaScript Debugging can sometimes be challenging and mysterious, hence knowing the common challenges of JavaScript can help you debug faster. Here is a list of some common challenges that may lead to a bug in the JavaScript program.

Challenge Set 1 — Lexical Errors

Lexical errors are encountered when the developers use unwanted symbols not part of the programming language. Usually, these are typo mistakes that go undetected while compiling.

To avoid these types of errors, it is good to break down the JavaScript code into pieces and avoid writing complex functions at once. This will help us easily debug such errors during the execution of the web application.

Challenge Set 2 — Syntactic Errors

Syntactic errors, also known as syntax errors, are the most common errors developers encounter. A syntax error arises when we use the correct symbols but in a method that doesn’t make sense to the interpreter or compiler.

These errors are always caught up by the interpreter or compiler and developers can fix them by seeing the error logs created while compiling.

Challenge Set 3 — Execution Errors

Execution errors, also known as runtime errors, occur when the code has a valid lexicon and syntax, but we’re making bad requests to get the results we desire.

Execution errors are usually encountered when we process data incorrectly coming from APIs. These errors can be encountered by using the Chrome debugger tool.

Challenge Set 4 — Logic Errors

These are errors encountered through faulty algorithm logic. Here, the code is executed successfully but leads to unexpected results. These are the most challenging errors to spot and usually the most expensive ones to correct.

Advanced JavaScript debugging is required to fix these issues. We may utilize the advanced features of Chrome debugger to fix these issues.

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Advanced JavaScript Debugging Using Cloud-Based Tools

Although this Chrome Debugger is great for debugging the code during the development of the application. But as our web app grows in size and complexity, it becomes difficult to test it manually for each and every functionality. Hence, developers usually automate the testing of web apps using the various automation tools available.

Cloud based automation tools are really useful because they can test our app in almost all popular browsers and platforms and hence ensure better quality assurance for the web app. One such popular cloud-based testing platform trusted by large enterprises as well as startups is LambdaTest.

LambdaTest is an AI-powered test orchestration and execution platform that provides a comprehensive solution for testing web and mobile applications with over 3000+ real device browsers and OS combinations, ensuring quality and speed.

Conclusion

Congrats! You have successfully completed debugging your JavaScript program using Chrome debugger. Chrome debugger has so much to offer. It is a powerful developer tool, and investing the time to master it will earn you a more efficient debugger tag.

We urge you to go and experiment with a debugger using your own web applications. Get used to analyzing the state of properties and variables at each point.

Stay tuned for further updates and announcements. You can also subscribe to Coding Jag — our weekly newsletter, and stay hooked to the latest news around the testing world.

Additionally, you can try out LambdaTest for more advanced testing of your web application. It can test your websites on multiple browsers and platforms at the same time.

Guide To Chrome Developer Tools

TanmayKumarDeo — Thu, 07 Dec 2023 05:23:38 +0000

For front-end developers and testers, finding and fixing bugs in the web app can be tough sometimes because of unexpected data from the API call and uncertain user interactions. All modern browsers have a developer tool to debug errors in the code.

Developer tools allow developers and testers to view and modify the HTML/CSS and JavaScript of the web page opened. It can also modify the DOM elements directly through the browser.

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Google Chrome, one of the most popular browsers, also has built-in developer tools called Chrome Developer Tools. This article will guide you on using Chrome developer tools for debugging and testing web applications.

What are Chrome Developer Tools?

Chrome Developer Tools or Chrome DevTools is a set of web development tools built into the Google Chrome browser that lets us inspect, edit, and debug our code and measure our page’s performance. These tools let developers see the changes on web pages in real time, diagnose problems more quickly, and build a better website. Explore 25 Best Debugging Tools for 2023, which will help you debug seamlessly.

How to Access Chrome Developer Tools?

To access the Chrome developer tools, developers may use the following three methods:

The easiest one is using keyboard shortcuts i.e. Ctrl + Shift + J in Windows and cmd + Option + J in Mac.
Open the browser menu by clicking on the three dots in the upper right corner, scroll down to the More tools option, and select the Developer tools option.
Right-click on the web page to debug and click on the Inspect option.

Different Components of Chrome Developer Tools

Elements: It can inspect and edit HTML elements and CSS style attributes.
Console: Mainly responsible for viewing logs and executing JavaScript code.
Sources: Used to debug JavaScript, edit JavaScript, add breakpoints, etc.
Network: Responsible for viewing and debugging network-related activities.
Performance: Used to analyze the web page load speed and optimization.
Memory: Assists in tracking memory usage and fixing memory-related issues.
Application: It inspects cookies, localStorage, sessionStorage, IndexDB, and any other local database.
Security: Used to debug certificates and other security problems.
Lighthouse: It audits the web app/website’s SEO, performance, quality, accessibility, etc.

Let’s have a detailed look at all these nine panels in detail.

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Elements Panel

The elements panel lets developers inspect and modify the HTML and CSS of the web page. With the elements panel, we can modify the code directly in the browser and see those changes instantly reflected on the web page.

Developers and testers mainly use the elements panel to experiment with the HTML structure or the web page’s design. Its features include a color picker, responsive screen sizes, CSS editor, layout analyzer, animation builder, event listeners, and rulers.

To inspect and modify any component we need to select that using the selection tool icon on the top right corner or by pressing Ctrl + Shift + C or Cmd + Shift + C as a shortcut. This will display the HTML/Document Object Model (DOM) and CSS for that component in the elements panel. Next, we can modify the HTML or CSS for that component. Any changes we make will be immediately reflected on the page and will not affect the source file directly.

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Console Panel

The console panel of the Chrome debugger is primarily used to write and execute JavaScript codes. We can also see the log output created by our website in this panel. To open the console panel, we can click on the console panel tab in the Chrome devTools.

This permits real-time examination of variable values using the Chrome developer tools’ console panel. Developers and testers may put various console.log() statements in their code and then see their output in the console panel as the user interacts with the browser.

Sources Panel

The sources panel allows developers and testers to view source code or bundle output. This panel is primarily used for complex JavaScript debugging. Here, we can view our source files and set up multiple breakpoints, watch variables and their values, and perform the majority of debugging. It contains a file tree that can navigate through all source code files. To open the sources panel, we can click the sources panel tab in the Chrome developer tools.

As shown in the image above, the sources panel has three primary components.

On the left, we have the File Navigator pane; it lists a file tree of the web app, including HTML, CSS, JavaScript, and other files, including assets attached to the web app. Chrome extensions’ files may also appear here.
In the center, the Code Editor pane displays all the source codes for the files selected from the File Navigator.
On the right, we have the JavaScript Debugging pane, which is especially used for debugging the JavaScript code.

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Network Panel

The network panel is mainly used to detect any upload or download request made by the webpage using the network. We can log and analyze all network activity in the log section.

The network panel in Chrome DevTools has a waterfall graph for all the resources loaded in the web app. This waterfall graph helps us measure the individual performance of each asset, resource, and API endpoint; hence, it can be used to improve the network performance of the web app. Furthermore, we can filter our time required by different types of resources like Fetch/XHR (for API requests), JavaScript, CSS, Img, Media, Font, Doc, and others.

To analyze the web app’s network performance using the Chrome Developer’s tool we can open the network panel by clicking on the Network tab. Next, we may clear all previous logs by clicking on the clear icon. Finally, we can refresh our web page to get the network log and real time waterfall graph of the website.

The network panel is used to monitor the number of requests made by a web page, total data transferred, loading time taken, resources downloaded or uploaded, caching performance, and other network-related activities. This information helps developers and testers to optimize individual resources and the web app.

Performance Panel

The performance panel in Chrome DevTools allows developers and testers to measure the page load performance of a web app. This is achieved by running a performance analysis on the web page and generating metrics on various aspects of the page load process, like the time taken by the web page to display, various network resources to load, and the web page to be interactive. To open the performance panel, we can click on the performance tab on the Chrome developer tools.

The record and reload page button in the performance panel of Chrome DevTools allows developers and testers to run performance analysis on a web page and view detailed metrics about how the page is rendering and loading. By clicking the reload button, the tool will simulate a user visiting and interacting with the web page, providing information about the page load process in graphs and screenshots.

Detailed performance analysis on the LambdaTest website is shown below.

We can even interact with call stacks and check functions that may consume more time, block the main thread, and delay the TTI (Time To Interactive) metric. Selecting a function provides all kinds of information for that function. We can check how long that function was executed and what other functions it called, and we can also open the function in the *sources *panel.

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Memory Panel

The memory panel in Chrome developer tools provides advanced insight into the web page’s memory consumption. We can inspect memory usage by component, snapshot heap allocation, and record allocation timelines.

The memory panel detects and fixes memory-related issues like leaks, bloats, and garbage collections. To open the memory panel, we can click on the memory tab on the Chrome developer tools.

This screen shows a summary of the memory used by the web page by analyzing the total JavaScript heap size of the web page. Detailed memory consumption data by the web page can be generated by clicking on the Take Snapshot button.

The Chrome DevTools memory panel allows us to select from three profiling types.

**Heap Snapshot
**This is one of the most commonly used memory profiling types. It allows you to take a snapshot of the JavaScript heap at a specific point in time. This snapshot shows the memory distribution between various JavaScript and related DOM elements of the web page.
**Allocation instrumentation on time
**This profiling type provides us with the memory distribution between various JavaScript and DOM elements over time while scrolling and interacting with the web page.
**Allocation Sampling
**The Allocation Sampling view maps memory consumption for individual page components like frames, documents, web workers, and graphics layers. This profiling type indicates the source of any high memory consumption.

Application Panel

The application panel in Chrome developer tools is used to inspect and edit the manifest file, service worker, cookies, localDB, sessionStorage, and other local databases. This panel is also used to view the website’s metadata, protocols, and icons.

To open the application panel, click on the Application tab in the Chrome DevTools.

The application panel is mainly helpful in inspecting the progressive web apps that use local storage and API. This helps developers and testers manage storage, caches, and databases; inspect and clear cookies; and inspect Resources.

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Security Panel

The security panel in Chrome developer tools displays connection security information for all network requests. This panel is used to determine if the data collected through network requests are secure or not. The website or network request will display a green lock icon if it is secure.

This panel can be used to view SSL certificates and encryption types of each network request and overall website. To open the security panel, we can click on the Security tab in the Chrome DevTools.

As shown in the image above, the security panel provides information about

Certificate verification, indicating whether the website has proven its identity with a TLS certificate.
TLS connection, indicating whether the website uses a modern and secure protocol.
Subresource security indicates whether the website loads insecure HTTP subresources (mixed content).

Lighthouse Panel

Google Lighthouse is an open-source, free tool that can help developers and testers analyze and improve the website’s performance, speed, and overall experience by generating a Lighthouse report.

The lighthouse panel in Chrome developer tools is equipped with Google Lighthouse, which can audit the website without any extra plugins or widgets. To audit a website on Chrome DevTool follow the steps below:

Navigate to the Lighthouse tab on Chrome developer tools.
Click on the “Generate Report” button in the image below.

It allows us to assess a website’s SEO, performance, accessibility, best practices in code, and progressive web app. It is also highly configurable, making it flexible and useful for all types of sites, from the simple to the highly complex. This flexibility includes several categories to run audits on both mobile and desktop devices.

Auditing the website uses a 1 to 100 scoring system based on tests run against a simulated 4G connection of the selected data. A generated report for the LambdaTest home page is shown below.

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Common Use Cases of Chrome Developer Tools

Chrome developer tools can be used in various scenarios to help us develop better websites. Here are a few common use cases of Chrome developer tools:

**Check responsiveness
**Front-end developers and testers most commonly use Chrome developer tools to check the responsiveness of websites. It allows managing viewport appearance using both free scaling and preselected sizes. This feature is available in the elements panel.
**Style into the website
**If we are trying to improve the design of an existing web page, we can navigate to one already existing and inspect it with Chrome developer tools. So if layout, sizing, colors, or design is an issue, we can modify the CSS and check if our copy still looks good in the environment it will be displayed. Finally, we can make the same change in our actual code base by copy-pasting.
**Identify issues in the website
**Chrome developer tools are commonly used to identify bugs and issues in the code. We can check the API requests and responses, JavaScript source files, and HTML files. We can even analyze and audit our page’s performance to improve our website.
**Catch non-working plugins
**Almost every website relies on a third-party plugin and widgets. Whether for analytics tools, form or popup tools, or chat add-ons, it’s crucial to keep track of whether they are working properly. Chrome DevTools can greatly help us in testing the performance of these tools.

Cloud Based Developer Tools

Although the Chrome developer tools running on our physical devices can greatly help us analyze and improve the website performance in various aspects, we must ensure that our website performs the same in all different browser versions, platforms, and devices. To achieve this, we may run real time testing on cloud based testing tools.

Cloud-based automation tools are handy because they can test our app in almost all popular browsers and platforms, ensuring better quality assurance for the web app. One such popular cloud based testing platform trusted by large enterprises as well as startups is LambdaTest.

With LambdaTest you can pace up cross browser testing while performing interactive and live testing on desktop and mobile browsers with our native cloud-based browser developers tools.

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How To Launch Developer Tools On LambdaTest?

To launch developer tools on LambdaTest, we can follow the steps below:

Before proceeding we must create a LambdaTest account by registering for free and then navigate to the dashboard.
Navigate to the real time testing dashboard by clicking the Real Time button from the left navigation menu.

Select the test configuration as per your choice. You can select from 8 different browsers on desktop and phone devices & their hundreds of versions to perform a real time test session. You may also select from multiple operating systems and screen resolutions for evaluating the website when rendered across various devices of different screen sizes.

After selecting browser configuration, enter a URL and hit the Start button to start testing.

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5. For desktop devices: Once the desired virtual machine is launched and operable, Right-click anywhere on the loaded webpage and click on the Inspect option.

6. For mobile devices: If your selected configuration of VM is a mobile device and once it is launched and operable, you can notice controller buttons on the left side of the screen. Click the icon button with the tools icon to open developer tools.

Bonus Chrome Developer Extension for Pro Debugging

LambdaTest brings a brand new Chrome extension called LT Debug to make the life of testers and developers easy and fuss-free while debugging. This free developer tool is simple to use with over nine amazing features used by web developers and testers during debugging on a day-by-day basis.

Even though there are various debugging tools in the market, we believe we are one among them! Here are some top reasons to trust our LT Debug Chrome extension:

It’s free to use forever.
All you need to do is fill out a simple form and start your debugging.
It provides access to 100+ extensions, to make the life of developers and testers easier.

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Here is our simple step-by-step guide on the installation process of LT debug:

Step 1: Go to the official LT Debug Chrome Extension page.

Step 2: Press the Add to Chrome button. You will be redirected to the Chrome web store.

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Step 3: Now press the Add to Chrome button on the top right. A pop-up will appear asking if you want to add “LT Debug” to the browser. Tap on Add extension.

Step 4: All done! Now, you can select the feature you want to use and start debugging.

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Conclusion

So there you have it! This article provides a basic overview of how Chrome developer tools can be used to test and debug your web apps and how you can use developer tools to test your web apps with cloud based testing tools. We also discussed some common use cases where Chrome developer tools can greatly help the developers.

Data Virtualization: Working, Advantages, & Disadvantages Explained

TanmayKumarDeo — Tue, 05 Dec 2023 07:32:51 +0000

Today’s businesses make quick, effective, and strategic decisions using “data.” A data-driven decision-making approach benefits the company regarding implementation, governance, and maintenance. However, these data are unorganized and unstructured across multiple data sources, making it hard to find and retrieve the “right” data.

Hence, to overcome this issue, we need methods and algorithms to organize and handle the data on a large scale and enable logical data management capabilities. Data Virtualization is one solution to overcome this challenge.

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This article focuses on how data virtualization can benefit developers and analysts in visualizing, predicting, and analyzing data to make critical and effective business decisions.

What is Data Virtualization?

Data virtualization is an umbrella term used to represent an approach for data management that allows an application to read and modify data without needing technical details. It includes how the data is stored and where it is physically located and formatted.

With data virtualization, we can retrieve real-time data from various data sources, like a database, data warehouse, cloud platform, or even an Excel spreadsheet, without physically replicating them. We can create a virtual copy of the data in the form of views.

Retrieving and organizing data from various databases in one place increases productivity and saves time. We can write standard SQL queries to read data from unified real-time sources. We can also modify data and send it back to the source, using transformation techniques(like constructive transformations, destructive transformations, aesthetic transformations, and structural transformations) to resolve differences in the source format.

How Does Data Virtualization Work?

Data virtualization uses a simple three-step method, i.e., Connect, Abstract, and Consume, to generate a holistic view of the required information for the organization’s users. These methods are performed by three layers of the data virtualization architecture:

Connection Layer

The Connection layer accesses information from a wide range of data sources — unstructured to structured, including SQL databases, streaming sources, big data systems, cloud repositories, No SQL sources, document files, and the Web. It uses various connectors to access specific data storage or applications. It also carries out normalization and type conversion of data sources so that all base views appear as relational at the upper layers.

Abstraction Layer

The Abstraction layer, also called the semantic or virtual layer, links all business end users and data sources, acting as the backbone of the entire data virtualization system. It allows data transformations with logical operations to seamlessly form abstracted data views using the base views delivered by the connection layer. In this layer, end users can perform metadata modeling, complicated data transformations, and data quality and semantic matching procedures using SQL queries and relational tools.

Consumption Layer

The consumption layer acts as a single point of interaction and access to the underlying data sources and the abstracted data views in a defined delivery format. The consumption layer offers the widest data delivery choices to suit the business user requirements via RESTful web services (output as JSON, HTML, XML, or RSS), SOAP protocol, ODBC, JDBC, OData, portlets, ADO.NET, and data widgets (JSR-286, JSR-168, or Microsoft Web Parts for SharePoint), JMS message queues, and exports to Microsoft Excel or SQL.

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Advantages of Data Virtualization

Data virtualization provides us with a unique data integration and management method that outperforms any other technology. The following are some benefits that data virtualization brings:

**Modernize Data Infrastructure: **Data virtualization can abstract underlying data systems, allowing architects to swap traditional systems with modern cloud apps without affecting business.
**Lesser Resources: **In data virtualization, data can be abstracted from various non-related sources without needing to have a physical copy of them. Thus, we require fewer hardware resources to process and store data.
Combine Data from different sources: The virtual data layer simplifies incorporating distributed data from Cloud Solutions, Databases, Data Warehouses, Big Data Platforms, and Data Lakes into user-defined data objects.
**Secure Data: **Data virtualization enables organizations to insulate critical data source systems from the end users and web apps, stopping them from unintentionally or intentionally changing the data.
**Faster and Cheaper Information: **Data replication costs money and takes time; with its no replication approach, data virtualization helps business users receive faster information without investing in additional storage.
**Flexibility: **Data virtualization makes it possible to respond swiftly to new developments in various industries. Data virtualization enables you to react quickly to new demands by providing integrated virtual data objects, eliminating the need to replicate data to other data levels but making it virtually available.

Disadvantages of Data Virtualization

Although data virtualization is versatile and applicable in several industries, the following are some drawbacks of using data virtualization.

**Single point of failure: **Because the data virtualization method provides a single point of access to all data sources, it frequently results in a single point of failure. If the server fails, all operational systems will be without a data stream.
**High Initial Cost: **The Initial setup of a data virtualization platform can be challenging, and the initial setup costs can be high.
**Not Suitable for Conserving Data: **Data virtualization is not suitable for keeping track of historical data; a Data Warehouse is more suitable in such cases.
**No support for batch data: **The data virtualization technique does not permit batch or mass data migration, which may be required in some situations. Assume a financial institution handling significant amounts of transactional data that must be processed once a week.

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Commonly Used Tools for Data Virtualization

Choosing the right tools and platforms can be a tricky process that demands in-depth research and usually comes down to multiple solutions. To make your quest more comfortable, we have profiled the standard data virtualization tools and platforms all in one place.

Actifio Virtual Data Pipeline

Actifio provides a Virtual Data Pipeline (VDP) that automates enterprise workload provisioning and renewal. It integrates with the existing toolchains and provides data scientists with data delivery and reuse via APIs and automation. Users can recover any data from any cloud at any point in time. Actifio is a comprehensive platform providing security and compliance capabilities for protecting, securing, retaining, and governing data regardless of location.

Denodo Platform

Denodo is a key player in the data management software market and a pioneer in the data virtualization area. It provides a robust capabilities package for data delivery, data integration, and data management, all while enabling self-service business intelligence, data science, hybrid/multi-cloud integration, and enterprise data services. Denodo boasts customers in over 30 industries, including large organizations and mid-market firms.

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IBM Cloud Pak for Data

IBM provides various integration tools for both on-premises and cloud deployments and every organizational use case. Its on-premises data integration package includes solutions for both classic (replication and batch processing) and modern requirements (integration synchronization and data virtualization). IBM also provides many prebuilt functions and interfaces for data virtualization.

Oracle Data Service Integrator

Oracle provides comprehensive data integration solutions for classic and new use cases in both on-premises and cloud deployments. The company’s product line includes technologies and services that enable organizations to do full-lifecycle data migration and enrichment. Oracle data integration for customer and product domains enables universal and continuous access to data across heterogeneous systems through bulk data movement, transformation, bidirectional replication, metadata management, data services, and data quality.

Data Virtuality Platform

The Data Virtuality platform integrates, accesses, and manages any cloud service and database by combining data virtualization and load, extract, and transform (ELT) procedures. It provides data pipeline solutions in two steps (self-service and managed) and Logical Data Warehouse, a semantic later that lets users access and model data from any database and API using analysis tools. Data Virtuality connects to over 200 data sources and provides a variety of data replication functionalities dependent on the use case.

CData Driver Technologies

CData Software provides data integration solutions for on-demand or on-premises access to databases, Web APIs, and applications. The provider specializes in giving customers access to data via well-known application platforms and data standards like ODBC, JDBC, ADO.NET, SSIS, BizTalk, and Microsoft Excel. Six categories make up the CData Software product line: OEM and custom drivers, cloud and API connectivity, enterprise connectors, data visualization, and ELT solutions.

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Practical Use Cases of Data Virtualization

Because of its wide range of advantages, data virtualization is commonly used in the industries. Let’s look at real-world use cases to see how businesses operating in various industries utilize data virtualization technology.

Business intelligence and analytics

Data virtualization tools can merge databases from various platforms (such as mainframe, UNIX®, and cloud) and kinds (such as VSAM, columnar, and relational databases) into a single view. Standard SQL queries will instruct the system to parse the query, submit it, and return the result set.

Data warehousing

Maintaining the most up-to-date information from your organization in your data warehouse while avoiding the impact on underlying systems. You may get all the benefits of cloud data warehouses by using data virtualization techniques. You can duplicate enterprise data to the cloud from nearly any source, capturing changes from various data sources without sacrificing source system availability or performance.

Real-time analytics and reporting

Data virtualization can be used to acquire real-time access to systems and to collect data from several sources to generate complex dashboards and analytics for objectives such as sales reports. These analytics boost company understanding by accessing real-time data, integrating it, and producing user-friendly infographics.

Identifying Business or Production Issues

Root Cause Analysis (RCA) can be performed via data virtualization. Changes can also be implemented in virtual copies to check and guarantee that they have no negative consequences before executing changes in the data source.

Agile BI (Business Intelligence)

Data virtualization can be used for self-service BI, regulated procedures, API/system connections, and data science. It enables quick dashboard iterations and smooth connectivity with SaaS cloud services like Salesforce and Google Analytics, making it ideal for agile BI. You may easily centralize your data and guarantee security even in a hybrid environment.

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Conclusion

In terms of cost savings and productivity increases, data virtualization is beneficial. Data virtualization allows faster data preparation, date snapshots that demand less disk space, and data from several sources for analytics or other purposes.

Furthermore, data virtualization systems can be highly sophisticated, with capabilities such as data cleansing solutions that assist the system in self-management, integrated governance, security, and the ability to roll back any changes done. Data virtualization has many practical uses, and businesses should investigate the potential solutions it might give for their needs.

Mastering QA Automation: A Comprehensive Guide

TanmayKumarDeo — Mon, 17 Jul 2023 08:19:16 +0000

In today’s era, both technology and quality matter. Software development has picked up a rapid pace, and its thorough testing also needs to match the speed. Quality Assurance or QA automation is the tool that can make the testing process faster and yet more reliable.

QA automation or Automated QA testing is a software testing method that uses automated testing tools to execute a set of test cases. In this article, we will discuss QA automation, its advantages, automation tools, processes, examples, and best practices. So, let’s get started with the article.

Understanding QA Automation

Quality Assurance (QA) automation (or automated QA testing) is the process of automating the testing activities of various software using automation tools and automation testing frameworks. Majorly, QA automation is used to perform repetitive (or manual) testing tasks previously executed by a human tester.

With the help of QA automation, we can streamline the testing of mobile apps or software with improved efficiency. Automated QA testing empowers us to deliver more reliable and robust software to end-users more effectively.

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Advantages of QA automation

In today’s era of fast-paced software development, QA automation has become a crucial tool for testing. Also, the complexities of software are increasing day by day along with the increased demand for faster delivery. Hence manual testing itself is not enough. To overcome this scenario, we can use automated QA testing, which offers many advantages over manual testing of software applications or mobile apps. Listed below are the key advantages of automated QA testing:

Faster & efficient testing: QA Automation, when used correctly, can execute test cases much faster than humans without human error. This reduces the total time required for software testing. Automated QA testing allows us to write feedback and report quickly on software quality. Also, automated testing can execute more reliable and efficient testing because it has lesser human intervention leading to fewer human errors.
Improved test coverage: With automated QA testing, we can run advanced tests like “parallel testing“. You may read about it in our blog on parallel testing. With the help of this feature, we can ensure comprehensive coverage of test cases across different situations, edge cases, and data combinations.
Consistency and repeatability: In automated QA testing, the tests follow predefined automated scripts without human interference. Hence the chances of human errors are completely eliminated while the execution of the tests. This ensures consistent execution of tests for reliable and reproducible results.
Cost and time savings: There are several test cases that consume a lot of time for proper execution if done by human testers. With automated QA testing, we can automate these time-consuming manual test cases. Hence we can save a significant amount of cost and time in the long run.
Regression testing: The objective of software testing is to find and fix various bugs. However, when one bug is fixed, other bugs often ensue. It is when regression testing comes into play. Regression testing ensures that no additional problems arise after a bug is fixed or a code is changed. With Automated QA testing, we can implement regression testing on our software applications or mobile apps.
Scalability: When any new feature is introduced in software, it needs to be tested thoroughly, and hence newer test cases are introduced. So, with the introduction of newer features, the number of test cases also increases. Manual testing itself cannot handle a large number of test cases, and thus QA automation is required. Automated QA testing can be easily scaled to handle a large number of test cases. It also allows for seamless testing across multiple operating systems, browsers, and platforms.
Continuous Integration and DevOps: With manual testing, it is difficult to manage the software’s code base as it becomes more complex. QA automation can solve this problem as it can integrate seamlessly with continuous integration and DevOps tools. This enables faster feedback loops, faster releases, and improved collaboration between teams.
Early bug detection. With manual testing, early bud detection is difficult; it can only find a bug after proper testing. But with the automated QA testing, we can find the bugs in the application earlier because of the predefined automated script. It is faster than manual testing for bug detection.
Increased productivity. With QA automation, we can automate repetitive and time taking tasks. Hence, QA testers in the team can focus on more critical aspects of testing, like test strategy planning, analysis, and exploratory testing.

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Selecting the Right Tools for QA Automation

Picking the right tools for QA Automation could be tricky as the use case can vary from person to person and also based on the project requirements.

Following are top-of-line checklists that one can consider while making a diligent choice:

Environment Support. While selecting a QA automation tool, we should always ensure that it supports the technology and environment in which the application operates. This includes compatibility of the software with web, desktop, mobile, or cloud-based platforms, as well as support for different operating systems and browsers.
Ease of Use. We should always look for a tool that offers a user-friendly interface and requires minimal effort to understand and utilize effectively. For this, we can consider factors such as intuitive navigation, clear documentation, and available training resources.
Database Testing. If the application interacts with databases, we should see if the automation tool we choose has database testing features. Selecting a testing tool that supports the generally used databases and supported query languages can have an enormous impact.
Object Identification. We must verify that the automation tool offers reliable and efficient support for identifying and interacting with application elements or the DOM. It ensures effective location and manipulation of the components on the UI of the software.
Error Recovery Testing. We should also consider whether the selected automation tool facilitates testing error handling and recovery scenarios. This involves the ability to simulate and handle unexpected errors. It should also be able to handle exceptions effectively during test execution.
Scripting Language Used. We can also check that the automation tool supports a scripting language that we are familiar with or willing to learn. Some common scripting languages used in automation tools include Java, Python, C#, and JavaScript.
Test Types Support. It is a good idea to confirm if the tool supports a wide range of test types based on our requirements. This may include functional testing, regression testing, performance testing, security testing, mobile testing, and test management.
Testing Frameworks. An ideal testing tool must support popular and important testing frameworks. Hence, before selecting the testing tool, we should check that the tool has proper support for popular testing frameworks such as Selenium, Appium, or TestNG. This allows us to leverage existing frameworks and libraries, enhancing test development and maintenance.
Comprehensive Reports. Detailed and well-structured data is very important for analyzing the test results and debugging. Therefore, we must pick an automation tool that can generate thorough test reports and outcomes. It would be preferable if the automation tool could also have some more functions, including customizable reporting formats and visual displays of test results. We should also check to determine if the tool provides us with useful insights that aid in our analysis and selection of test strategy.
Training Cost. Last but not least, we should also consider the cost of training and certification associated with the selected automation tool. For this, we should properly evaluate the available training materials, online and offline courses, and community support.

Therefore while selecting the right automation tool for our needs, we should start by identifying our specific requirements. And then, we can explore different tools and their capabilities. Proper research and comparison of various tools will also help. Finally, we should conduct a Proof of Concept to assess the tool’s suitability for our automation needs.

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Best Automation Testing Tools

There are hundreds of QA Automation tools available in the market. Here are some best automated QA testing tools.

LambdaTest
LambdaTest is one of the most preferred cloud-based cross browser testing platforms where we can fasten our release speed with high-end test automation on the cloud. It supports all popular frameworks and tools integration for web testing and app test automation, such as Selenium, Appium, Cypress, Puppeteer, Playwright, Taiko, XCUITest, Espresso, and so on.
Puppeteer
Puppeteer is a Javascript library based on Node.js developed by Google that lets us control headless Chrome through the DevTools Protocol. Over the DevTools Protocol, it provides an API for controlling headless Chromium or Chrome. Puppeteer lets us automate the testing of our web applications. With it, we can run tests in the browser to see the testing results in real time on our terminal.
Playwright
Playwright, built by Microsoft, is a Node.js library that uses an API for automating Firefox, Chromium, and WebKit. It is mainly designed to enable efficient, powerful, and reliable automated browser testing. The playwright can also automate Microsoft Edge as it is built on the open-source Chromium web framework. It shares a similar syntax to Puppeteer, but it has overcome many limitations present in Puppeteer.
Selenium
The most popular and widely used testing tool among all automation testing tools listed is Selenium. Selenium is an open-source and free-to-use automation testing suite of automation tools. It is widely used for testing different web applications because of its customizable test automation features. It offers compatibility with various programming languages such as Python, Java, JavaScript, C#, and more. Hence, Selenium allows testers to automate website testing in any programming language.
Cypress
Cypress is a new automation testing tool specially built for front-end developers. Written in JS (JavaScript) and built on top of NodeJS and WebDriver, Cypress tests run in almost all modern browsers. It’s simple to use, fast, and reliable. Cypress is also open-source and free to use.
Appium
Appium is popular, open-source, and widely used for automation testing native, hybrid, and mobile web apps. It can run Windows, Android, and iOS apps that use the WebDriver protocol. The main idea behind the screens of Appium is when we test a native app, it should not involve an app recompilation or SDK.
Cucumber
Cucumber is a popular and widely used testing tool that supports Behavior Driven Development (BDD) . With cucumber, we can write more understandable tests with no technical knowledge. As for BDD, business analysts and product owners would write acceptance test cases or test scenarios to check the system behavior from the business perspective. The combination of Selenium Cucumber provides a more reliable and robust framework that allows us to create functional tests easily.

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Automated QA Testing Process

The process of automated QA testing involves several key steps to ensure efficient and effective testing. Let’s explore each step in detail.

Test Tool Selection
It is crucial to select the appropriate automation tool that aligns with the technology used in the Application Under Test (AUT). We should consider factors such as compatibility, ease of use, available features, and support for the desired programming language or framework.
Define the Scope of Automation
Proper testing of the areas and features of maximum business importance needs to be prioritized. Hence we should first define the areas or features of maximum importance that need to be automated. We can analyze the data volume and identify common functionalities that must be tested repeatedly.
Planning, Design, and Development
It is essential to properly plan the process before automating the test cases in any organization. Thus we should design and develop a comprehensive automation strategy. Properly planning the goals, timelines, and resources required will make the testing as easy as ABC. But that alone is not enough, designing and developing strategies for automated QA testing also carries weight. In the end, this step cannot be completed without properly selecting the right automation framework, test architecture, and test scenarios.
Test Execution
Properly planning and developing the strategies for automated QA testing makes it easier to do the rest. But still, one of the most important tasks to do is actually to execute the automated tests. We can plan out the algorithm to write the automation scripts. And hence we can execute test cases using the automation scripts with the selected tool. The selected automation tool performs the actual test just as it is directed by the automation script.
Test Automation Maintenance
The automated QA testing needs to be regular as clockwork and hence needs to be maintained properly. Regular testing helps us go the extra mile to check the quality of new features added. To succeed, we should regularly maintain and update the automation algorithm. This helps us in avoiding script and test case failures.

By following through with the above five processes, we can increase the chance for automated QA testing to succeed. With these processes, we can efficiently execute tests, fastly give feedback, and ultimately, improve the software quality.

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A Step-by-Step Example of Test Automation

In this section, we will implement automated QA testing on a calculator app. With the help of programming, we can automate the testing. For simplicity, let’s take the example of adding two numbers in the calculator. Listed below are the manual testing steps.

Steps for Manual Testing:

Launch the app.
Press the number 4.
Press the addition button (+).
Press the number 2.
Press the equals button (=).
Verify that the app displays the number 6.
Close the calculator.

Now to automate the testing we need to choose the appropriate logic and programming language. In this example, we will use the C# programming language. We can write the automation logic in C# similar to how we wrote the manual testing steps. Below is the script for automation testing.

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Automated Testing Script:

[TestMethod.]
    public void TestCalculator()
    {
        // Launch the app.
        var calc= ApplicationUnderTest.Launch("C:\Windows\System32\calculator.exe");


        // Perform the necessary operations.
        Mouse.Click(button4);
        Mouse.Click(buttonAdd);
        Mouse.Click(button2);
        Mouse.Click(buttonEqual);


        // Evaluate the result.
        Assert.AreEqual("6", txtResult.DisplayText, "The calculator should display 6.");


        // Close the app.
        calc.Close();
    }

The above C# code first launches the calculator application using the ApplicationUnderTest.Launch method. Once the calculator opens then the script performs multiple mouse clicks one by one in the following order:

Automatic mouse click on (button4) number 4.
Automatic mouse click on (buttonAdd) addition button.
Automatic mouse click on (button2) number 2.
Automatic mouse click on (buttonEqual) equals button.

As soon as the (buttonEqual) is clicked the result is displayed on the calculator app. Next, it compares the value of txtResult.DisplayText with the expected value of “6” to verify the result displayed in the app. If the values are not equal, it raises an assertion failure, and hence we can say that the above script automates the testing.

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QA Automation Best Practices and Scenarios

To maximize the return on investment (ROI) of QA automation, we need to select the right test cases for automation. Similarly, we should also know about the test cases that do not require QA automation.

Test cases that require QA automation

Listed below are a few scenarios ideal for automated QA testing.

High Risk — Business Critical Test Cases
Automated testing is crucial for test cases that pose significant risks if not executed properly. These test cases help ensure stability, reliability, and security.
Repeatedly Executed Test Cases
Test cases that need to be executed repeatedly, such as regression tests, are excellent candidates for automation. Automating these tests saves time and effort. It eliminates manual repetition and finds potential issues more frequently.
Tedious or Difficult Test Cases
Test cases that are laborious, monotonous, or involve complex steps are ideal for automation. Automating these cases reduces human error and increases accuracy. It also frees up valuable time for testers to focus on more challenging or exploratory tasks.
Time-Consuming Test Cases
When we test some test cases manually with human intrusion, some of them consume a long time. Such test cases can be automated, which will speed up testing and boost output.

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Test cases that do not require QA automation

On the other hand, automated QA testing is not always advantageous, and there are some situations in which it may not be very effective.

Let’s see some of the scenarios where using automated QA testing will not be ideal:

Newly Designed Test Cases

There are test cases that are newly designed and are not executed manually ever. We should test these newly designed test cases manually at least once. This allows for a better understanding of the issue and the potential need for adjustments.

2. Frequently Changing Requirements
Test cases subject to frequent changes in requirements may not be suitable for automation. Here, maintaining and updating automated tests can become challenging and time-consuming. Manual testing may be more flexible and adaptable in such cases.

3. Ad-hoc Test Cases
Test cases executed on an ad-hoc basis, often without predefined steps or expected outcomes, may not be the best fit for automation. These cases need human judgement, and flexibility, which are better in manual testing.

By considering these scenarios, we can optimize the effectiveness and efficiency of our QA automation efforts. Carefully selecting these test cases for automation ultimately improves the software quality.

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How LambdaTest Helps Implement Best Practices in QA Automation

LambdaTest is a powerful cloud-based testing platform. It helps streamline QA automation processes, enhancing overall testing efficiency. Here’s how LambdaTest helps us implement best practices in QA automation:

Comprehensive Browser and Device Testing
With LambdaTest, we can perform cross-browser and cross-platform testing effortlessly. This ensures compatibility and a seamless user experience with our product.
Parallel Test Execution
Here, we can execute automated tests in parallel across multiple browsers and devices simultaneously. It reduces test execution time and accelerates the overall testing process.
Test Case Analytics
LambdaTest offers advanced test case analytics that allows us to track the tests conducted on the platform. It provides us with deep-level insights along with the numerous widgets.
Easier Integration with Automation Frameworks
We can integrate it with all popular automation frameworks like Selenium, TestNG, and Appium.
Scalability and Flexibility
Scale automation tests effortlessly on LambdaTest’s scalable cloud infrastructure, handling projects of any size without compromising performance. Flexible plans cater to specific requirements and budgets.

By incorporating LambdaTest into our QA automation strategy, we can enhance testing efficiency, improve software quality, and achieve faster time-to-market. Leverage LambdaTest’s features and capabilities to optimize QA automation efforts and ensure a seamless user experience across browsers and devices.

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Overcoming Challenges in QA Automation

QA automation brings tons of benefits when it comes to software testing. But it also has its own set of challenges. By understanding and overcoming these challenges, we can ensure the successful implementation of QA automation. Listed below are some common challenges in QA automation and methods to overcome them:

Choosing the Right Automation Tool or Framework

Choosing the correct automation tool or framework is very important for successful QA automation. There are hundreds of tools available, both open-source and licensed, making it difficult to choose. We must evaluate different options based on our project requirements, compatibility, scalability, and ease of use. We should also conduct thorough research and consider industry best practices. And seek recommendations from experts or peers to make an informed decision.

In the process of identifying the right automation tool, LambdaTest emerges as a compelling choice. With its robust and reliable features and capabilities, LambdaTest offers a comprehensive cloud-based testing platform to simplify QA automation. It provides a wide range of real browsers and operating systems. This allows testers to perform cross-browser and cross-platform testing effortlessly.

Employing Skilled Testers or Training Existing Teams

QA automation needs skilled testers who know programming languages and automation tools. We should invest in hiring experienced testers or provide training to our existing teams to enhance their automation skills. We can offer relevant training programs, workshops, or certifications. This ensures our testers are well-equipped to handle automation challenges effectively.

LambdaTest’s user-friendly UI and easy-to-use features make it accessible for both freshers and skilled testers. LambdaTest has sufficient resources, blogs, learning-hub, and documentation to help us collect the specified abilities in one place. With the help of proper sources from LambdaTest, teams can overcome the trouble of unskilled trainers and testers.

Deciding on Test Automation Strategies

It could be essential to properly plan the technique before automating the test cases in any enterprise. Thus we must design and increase a comprehensive automation strategy. We need to analyze our software’s necessities and prioritize the test cases accordingly. We should also identify appropriate test cases for automation. To design our automation strategies and a balance between manual and automated testing we should consider the factors like the frequency of test execution, complexity of test case and software, and business goal.

LambdaTest’s vast browser and operating system support enable us to implement diverse test automation strategies. It allows us for cross-browser and cross-platform testing, facilitating comprehensive test coverage. With LambdaTest’s parallel test execution capability, we can execute tests simultaneously across multiple browsers and devices. This reduces test execution time and increases efficiency.

Setting Realistic Expectations

We should set very realistic expectations for QA automation, considering factors like resources, time, and scope. Automated Qa testing is a long-term investment and thus requires continuous effort and maintenance. To align our expectations with the project’s reality, we should also consider the benefits, limitations, and expected outcomes of QA automation.

LambdaTest offers scalable and flexible, and budget-friendly plans that can align with our expectations. It provides us with a cost-effective solution. By exploring LambdaTest’s capabilities, we can set realistic expectations for QA automation and improve test efficiency and software quality.

Initial Investment of Capital

Implementing QA automation may require an initial investment of capital for tools, infrastructure, and training. We should calculate the potential return on investment (ROI) by considering factors like time, improved test coverage, and reduced human error.

LambdaTest reduces our need to invest heavily in infrastructure and tool setup. As a cloud-based platform, it provides a cost-effective testing tool. LambdaTest’s flexible pricing plans cater to organizations of all sizes. It allows us to optimize our automation efforts without significant upfront costs.

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Conclusion

In this blog, we discussed QA automation along with its advantages, automation process, and selecting the best tool for automated QA testing. We also discovered a detailed example of automation to test a calculator for adding two-number functionality, along with the best practices and scenarios for automated QA testing. Various challenges in QA automation and strategies to overcome them were also discussed. We also explored how LambdaTest, a powerful cloud-based testing platform, can help overcome the challenges in automated QA testing.

By incorporating LambdaTest into our QA automation strategy, we can optimize our testing efforts, enhance software quality, and accelerate time-to-market. Embrace the best practices in QA automation, overcome the challenges, and leverage the power of LambdaTest to achieve seamless testing experiences across browsers and devices.

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How To Download And Setup Edge Driver For Selenium

TanmayKumarDeo — Fri, 14 Jul 2023 09:12:28 +0000

When it comes to cross browser testing, the majority of the developers (or automation testers) express a feeling falsely that testing on popular and modern browsers like Google Chrome, Mozilla Firefox, and Safari should be sufficient to deliver a top-notch software or application product. However, it is very crucial to consider browsers like Microsoft Edge, Opera, Brave, etc., when building a strong Selenium strategy.

Microsoft Edge has been the trending news in the last couple of months due to its growing AI capabilities. Hence its market share has increased significantly, and it is right behind Apple’s Safari browser. Therefore, it should be on our list of browsers on which automation testing be performed.

Like all other popular browser vendors, Microsoft also provides a separate and specialized driver named “Edge Driver.” It acts as an intermediator between the Microsoft Edge browser and Selenium framework, thus helping to automate Selenium test cases on the Edge browser.
Subsequently, in this article, we will cover the details of Edge Driver, its benefits, features, and how we can run a Selenium test on Edge browser using Edge Driver with an example.

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Understanding Edge Driver?

In Selenium testing, the concept of “Selenium WebDriver” plays a vital role in unlocking the full potential of automation on any browser. Microsoft offers a Selenium WebDriver for automating the Microsoft Edge browser called Edge Driver. It acts as a bridge for seamless communication between the Selenium framework and the Microsoft Edge browser.

Whether it be x86, x64 Windows, Mac, or Linux, the Edge driver comes with different versions to support all of them. Any version can be downloaded based on the browser version and the operating system we want to use.

The Edge driver is used to automate the Microsoft Edge browser for Selenium testing purposes. It simulates user interactions like button clicks, text entries, and navigation through different web pages.

When we run any Selenium test case with the Edge driver, we establish two-way communication between the Selenium framework and the Microsoft Edge browser. We utilize this communication information to see if the program’s instructions are sent correctly to the browser. It can be used to extract real-time data from static or dynamic site elements like text, links, or images.

Let’s look at its benefits and features; we’ll uncover how this driver can make a difference in our testing and development efforts. So, get ready to dive in further.

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Benefits of Edge Driver

Till now, we have learned about the Edge driver in brief. In this section, we will explore how this driver can revolutionize our testing experience and empower us to achieve greater efficiency and accuracy for automation on the Microsoft Edge browser. Although the Selenium Edge driver comes with a ton of benefits, we have covered a few crucial points in the below list:

Enhanced Automation: The Selenium Edge driver is like a trusty companion that makes automating tests on the Microsoft Edge browser a breeze. It simplifies the entire process of automation, making it super easy to ensure that web applications are working just as they should. With the Selenium Edge driver by our side, we can effortlessly navigate through web pages, interact with different elements, and double-check that everything is acting as expected on the Microsoft Edge browser.
Seamless Compatibility: When testing a web application on a specific browser, compatibility between the desired automation tool and the specified browser is crucial. With the Selenium Edge driver, we can achieve seamless integration with different versions of Microsoft Edge across different operating systems, ensuring tests run smoothly and consistently, regardless of the browser version.
Edge-Specific Features: Using the Selenium Edge driver, we can access Microsoft Edge’s unique features. These features provide us leverage to take screenshots, respond to alarms or dialogs, and run custom JavaScript code. Hence, these features enable us to write robust and solid test cases.

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Features of Edge Driver

All the versions starting with the first supported version of the v79 Microsoft Edge browser, have been implemented in Chromium. Hence major Edge driver versions have support for most of the functionalities of the Chrome driver. In this section, we have tried to list down the most valuable and popular features of the Selenium Edge driver in the following points:

Seamless Browser Interaction: Microsoft developed The Edge driver to handle automation seamlessly with the Microsoft Edge browser. It seamlessly integrates with the browser and the Selenium WebDriver. It allows automation testers and developers to navigate through web pages effortlessly, interact with different elements, and simulate user actions to guarantee accurate and reliable testing.
Full Compatibility: The Edge driver is like a weathercock, adapting to different versions of Microsoft Edge on different operating systems. With its diverse range, it ensures full compatibility across different Edge browser versions. This gives us the confidence to conduct testing without any worries, knowing our web application will work seamlessly regardless of the Edge version.
Cross-Platform Support: The Edge driver is flexible, which extends its support to multiple operating systems like x86, x64 Windows, macOS, and Linux. With this cross-platform compatibility, we can conduct Selenium testing on various OS and environments, ensuring that our web application functions flawlessly on Microsoft Edge, regardless of the platform it is being accessed on.
Edge-Specific Capabilities: We can unleash the power of Microsoft Edge’s unique features with the Selenium Edge driver. This driver grants us access to unique Edge-specific functionalities that will take our testing experience to new heights. We can effortlessly capture screenshots, effectively handle alerts or dialogs, and execute custom JavaScript code mainly designed for the Microsoft Edge browser.
Browser Configuration (Options): Tailoring the testing environment to meet our needs is a cakewalk with the Edge driver. This tool provides various configurations, giving us the power to customize the browser behavior to suit our testing requirements. We can tweak settings like the browser window size, user agent, proxy configurations, and more. We can create a personalized testing environment that aligns with our web applications on Microsoft Edge.
Command Line Switches: With the Edge driver, we have the power to customize our browsing experience using command line switches. These nifty little features allow us to pass a list of instructions when starting the browser, giving us more control over its behavior during testing. For example, we can use the “-start-maximized” switch to open the browser window in full-screen mode or the “–headless=new” switch to run the browser in a headless mode without a visible user interface.
Network Traffic Control: Imagine having the power to control and monitor network traffic while testing our web applications with the Edge driver! Network Traffic Control allows us to simulate different network conditions like slow internet or limited bandwidth. By replicating real-world scenarios, we can ensure that our web application remains responsive and performs well, even in challenging network environments. So, whether it’s a spotty connection or a slow network, the Edge driver helps us uncover how our web app handles these situations and ensures a smooth user experience for everyone, regardless of their network conditions.
Robust Error Handling: The Edge driver has robust error handling powers. When something goes wrong during testing, it doesn’t leave us hanging. Instead, it jumps into action, providing us with clear and informative error messages. It even gives us stack traces, like breadcrumbs, to track down the root cause of the failure.

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Setup and Integration of Edge Driver with Selenium Framework

Now that we have gone through the benefits and features of the Selenium Edge driver let’s find out the methods for setting up and integrating the Edge driver with the Selenium framework. For the scope of this article, we will install the Edge driver on the x64 Windows operating system. Also, we will be using the Python programming language with Selenium for automating the Microsoft Edge browser moving onwards.

Pre-requisites

Before we jump on to the setup and integration of the Edge driver for the Microsoft Edge browser, let’s look at a few of the prerequisites for Selenium Edge Driver to run the Selenium test cases. Subsequently, we will examine all the configurations and programs required for executing the Selenium test cases on the Microsoft Edge browser:

Edge Browser: The most apparent prerequisite is the Edge Browser. We recommend having the newest version of the Edge browser, but the current version will also work. To download the Microsoft Edge browser, follow the official download link.
Python: Although Edge driver supports a variety of programming languages, we would be moving ahead with the Python programming language for the scope of this article. Python has sufficient community support and is easy to understand. It offers various libraries that make automation testing easier. To download Python, we can visit their official download Python page and choose the latest version according to our operating system.
Visual Studio Code(VS Code): VS Code is a free and popular code editor that helps us start coding quickly. It has support for many programming languages, like C++, Java, Python, Javascript, Ruby, etc.,

In this article, we will use the VS Code as our code editor. We can download the latest version of VS Code by visiting the official download page for Visual Studio Code and selecting the correct system configuration.

Selenium Framework: Selenium is a powerful tool for controlling a web browser through an executable script or code. It is available for all browsers and works on all major OS. We will use the latest Selenium framework with the Edge driver. We can install the latest version of Selenium by executing the following command:

    pip install selenium

If you are getting an error while executing this command, there may be a possibility that PIP manager is not installed on your system, which is a must. PIP is a package management system used to install and manage software packages written in Python. However, if you don’t have pip, you can install it using the below command in your terminal:

    curl https://bootstrap.pypa.io/get-pip.py | python

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Setup and Integration of Selenium Edge Driver

Once we have downloaded all the prerequisites for the setup and integration of the Selenium Edge drive, we can move on to the actual installation and setup. The installation and setup of the Edge driver with the Microsoft Edge browser and Selenium involves the following steps:

First, we need to check the current version of the Microsoft Edge browser. To do so, open the Edge browser and click on “Settings and More” (the three dots) at the top right corner or press alt + F. Then, hover over “Help and Feedback ” in the settings menu and click on About Microsoft Edge. On the About page, we can find the current browser version, as shown in the image below.
Next, we need to download the Edge driver for its setup and integration. We can visit the official Microsoft Edge driver download page to download the Edge driver. On the page, we can select the appropriate version based on the operating system and browser to download it. Make sure to download the correct version according to the browser; otherwise, we may get a runtime error or some unexpected crash.
Once the download is complete, a zip file gets saved. We need to extract the downloaded zip file and store it in the desired location. After extracting it, we can find the executable file — msedgedriver.exe file at the selected location as sown in the image below:
We will jump into the setup and integration of Edge driver with the Selenium framework to automate the Microsoft Edge browser. Hence we will start by creating a Python file named “automation_script_selenium.py” and open it in Visual Studio Code.
Finally, we will integrate the Edge driver with the Selenium framework to open a browser session. Here we will open the browser and then navigate to a web page (https://www.lambdatest.com) with an automation script.

  from selenium import webdriver
    from selenium.webdriver.edge.service import Service


    # Driver Code
    if __name__ == '__main__':
        # create service object
        edgeService = Service(
            r"D:\\Lambdatest Tools\\edgedriver_win64\\msedgedriver.exe")


        # create webdriver object
        edgeDriver = webdriver.Edge(service=edgeService)


        # open browser and navigate to the website
        edgeDriver.get('https://www.lambdatest.com')

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Automating a ToDo App on Edge Browser Using Edge Driver

In the previous section, we looked at how to set up and integrate the Edge driver with the Selenium framework. We opened a specified web page by automating the Microsoft Edge browser. Now let’s look at automating some real-world scenarios like filling and submitting forms and testing the behavior of the web app.

In this article, we will automate a simple Todo App for testing the functionality of “Creating todos,” “Marking as completed,” and “deleting todos.” For simplicity and better understanding, we will split this example of automating the Todo app into three parts separately for testing each functionality. So, let’s dive into the example to master the automation testing on Microsoft Edge through the Edge driver.

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Create Todos

The first and undeniable functionality to test in any todo app is its capability of creating new todo and displaying it on the todo list. In this example, we will create three todos and add them to the list one by one with a visible time gap.

The first step for writing any automation script is to figure out the proper intuition and algorithm for the particular test case. The testing algorithm that we will follow for this example will be as follows:

Start the Microsoft Edge browser and then open the specified URL (https://tanay-deo.web.app/todo) to be tested.
Select the input tag (“Enter a Todo”) for adding todo and then write the content for the todo to be added.
Once the content for todo is entered in the input tag, we need to click the button “Add Todo” for adding the todo to the list.
Verify if the desired todo is added to the list or not.
Repeat the steps from 2 to 4, for adding multiple todos and testing.

Now we can move ahead to create the automation script based on the above algorithm to automate the Microsoft Edge browser through the Selenium Edge driver. For this automation script, we will be using the Python programing language with the Selenium framework in VS Code as discussed earlier. So, let’s create a file named “add_todos.py” and write the automation script as shown below:

from selenium import webdriver
    from selenium.webdriver.edge.service import Service
    from selenium.webdriver.common.by import By
    import time




    def add_todos(edgeDriver):
        # Add todos one by one
        todos = ["Buy groceries", "Finish homework", "Go for a run"]
        for todo in todos:
            # Find the input field
            input_field = edgeDriver.find_element(
                By.CSS_SELECTOR, ".add-todo input[type='text']")


            # Enter the todo text
            input_field.send_keys(todo)


            # Introduce a delay for a realistic effect
            time.sleep(1)


            # Find the "Add Todo" button and click it
            add_button = edgeDriver.find_element(
                By.CSS_SELECTOR, ".add-todo button")
            add_button.click()


            # Introduce a delay for a realistic effect
            time.sleep(1)




    # Create the Edge Driver service
    edgeService = Service(
        r"D:\\Lambdatest Tools\\edgedriver_win64\\msedgedriver.exe")


    # Create the Edge WebDriver
    edgeDriver = webdriver.Edge(service=edgeService)


    # Open the Todo app
    url = "https://tanay-deo.web.app/todo"
    edgeDriver.get(url)


    # Call the add_todos method
    add_todos(edgeDriver)


    # Close the browser
    edgeDriver.quit()

In the automation script above, we first create an instance of the Edge Driver service as “edgeService,” providing the path to the Microsoft Edge WebDriver executable file. And then, we create an instance of the Edge WebDriver as “edgeDriver,” passing the edgeService object as an argument as we did earlier in the previous sections.

Here the add_todos(edgeDriver) method is mainly responsible for creating multiple todos and adding them to the todo list as described in our algorithm. It selects the input_field and add_button with the help of the find_element and CSS_SELECTOR attributes of the Selenium Edge driver.

Based upon the selection, it first enters the todo content in the input_field and then performs a click operation on add_button to add the todo to the list. We can also verify if our site is working properly with the visible changes on the todo list, as shown in the image below.

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Mark First Todo as Completed

In this example, we will move one step ahead and test the functionality for “marking a todo as completed.” To do so, we will mark the first todo in the todo list from the previous example.

The intuition to mark the first todo element as complete will be very simple. It includes identifying the correct list item and then marking it as completed. The testing algorithm that we will follow for this example will be as follows:

The obvious prerequisite for this test case is that the todo list must have one or more items in it. So, make sure that the todo list has an element in it. If not then we must add a few todos by following the above example.
Find all the elements present in the todo list with the help of CSS_SELECTORS and their class names.
Select the desired todo item by accessing the first child of the todo list.
Find the “Mark as Complete” button for the selected list item and toggle that to mark it as completed.
Verify if the first todo element is marked as completed or not.

Let’s move ahead to create the automation script for automating the task of “Marking a todo as completed” on the Microsoft Edge browser through the Edge driver. We can create a file named “mark_completed_todo.py” and jump into the code as shown below:

from selenium import webdriver
    from selenium.webdriver.edge.service import Service
    from selenium.webdriver.common.by import By
    from add_todos import add_todos
    import time




    def mark_first_todo_completed(edgeDriver):
        # Locate the first todo in the list
        first_todo = edgeDriver.find_element(
            By.CSS_SELECTOR, ".todo-list li:first-child")


        # Click the checkbox button to mark it as completed
        checkbox_button = first_todo.find_element(
            By.CSS_SELECTOR, ".checkbox-button")
        checkbox_button.click()


        # Add time delay for ralistic effect
        time.sleep(2)




    # Create the Edge Driver service
    edgeService = Service(
        r"D:\\Lambdatest Tools\\edgedriver_win64\\msedgedriver.exe")


    # Create the Edge WebDriver
    edgeDriver = webdriver.Edge(service=edgeService)


    # Open the Todo app
    edgeDriver.get("https://tanay-deo.web.app/todo")


    # Add todos
    add_todos(edgeDriver)


    # Mark first todo as completed
    mark_first_todo_completed(edgeDriver)


    # Close the browser
    edgeDriver.quit()

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In this automation script for marking the first todo as completed, first, we create a new browser session by the use of the Selenium WebDriver service object and the edgeDriver object similar to the previous example.

The code first calls the add_todos method to ensure that the todo list has some elements. After mark_first_todo_completed method is called which detects the first_todo element with the help of find_element and CSS_SELECTOR attributes of the Edge driver. Similarly, it also finds the checkbox_button to toggle the “Mark as completed” button. Finally, it performs a click option to mark it as completed. And we can verify the result as the color of the todo element changes as shown in the image below.

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Delete the Completed Todos

Now, in this example; we will delete all the todos marked as completed. Doing so will test our web app for the delete todo functionality and ensure that our app is completely functional and responsive with the Microsoft Edge browser. We will write the script for this example in continuation to the previous examples.

Figuring out the testing algorithm for this example is as simple as that of the “Mark First Todo as completed” with just a few modifications. The process involves the selection of all the completed lists and then iterating through them to delete them one by one. The steps for the testing algorithm can be described as follows:

First step is to make sure that there is at least one todo marked as completed in the todo list on the web app. If not, then we can add some by following the previous examples.
Select all the completed todos from the todo list using CSS Selectors on the “.completed” class.
Iterate through each selected list and find their respective delete button with the help of CSS Selectors.
Perform mouse click on each of the delete buttons one by one to delete them.
Verify the testing results by checking if all the todos marked as completed are deleted or not.

Now let’s start creating the automation script for this particular example as we did in all previous examples. The automation script will be designed based on the testing algorithm we just figured out. So, we can start by creating a new Python file named “delete_todos.py” as shown below:

from selenium import webdriver
    from selenium.webdriver.edge.service import Service
    from selenium.webdriver.common.by import By
    from add_todos import add_todos
    from mark_completed_todo import mark_first_todo_completed
    import time




    def delete_completed_todos(edgeDriver):
        # Find all completed todos
        completed_todos = edgeDriver.find_elements(
            By.CSS_SELECTOR, ".todo-list li.completed")


        # Iterate over completed todos and delete them
        for todo in completed_todos:
            delete_button = todo.find_element(
                By.CSS_SELECTOR, ".delete-button")
            delete_button.click()
            time.sleep(1)




    # Create the Edge Driver service
    edgeService = Service(
        r"D:\\Lambdatest Tools\\edgedriver_win64\\msedgedriver.exe")


    # Create the Edge WebDriver
    edgeDriver = webdriver.Edge(service=edgeService)


    # Open the Todo app
    edgeDriver.get("https://tanay-deo.web.app/todo")


    # Add todos
    add_todos(edgeDriver)


    # Mark first todo as completed
    mark_first_todo_completed(edgeDriver)


    # Delete completed todos
    delete_completed_todos(edgeDriver)


    # Close the browser
    edgeDriver.quit()

In the above example, we first created a new instance of the Microsoft Edge browser to automate the task of deleting the completed todos.

The code first calls the add_todos method to make sure that the todo list has some elements. After that, mark_first_todo_completed method is called. It marks the first element as completed, as discussed in previous examples. Next, the delete_completed_todos method is called; it detects the completed_todos list with the help of find_element and CSS_SELECTOR attributes of the Edge driver applied on the “.todo-list li.completed” class. Similarly, it also finds the delete_button for each completed_todos and performs a click option to delete it from the todo list. And we can verify the result as visible on the automated Microsoft Edge session as shown in the image below.

The complete code for the three examples discussed can be found in this GitHub repo.

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How Cloud-Based Platforms help overcome Automation challenges?

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LambdaTest is a cloud-based platform that helps overcome automation challenges by providing a scalable infrastructure and facilitating seamless collaboration. With LambdaTest, organizations can execute automated tests on multiple browsers, operating systems, and devices simultaneously, reducing the need for an extensive in-house testing setup.

The cloud platform also enables real-time collaboration, allowing teams to work together efficiently, regardless of location. Additionally, LambdaTest’s parallel testing capabilities optimize test run times, enhancing productivity for organizations with large test suites or tight release schedules. By leveraging LambdaTest, businesses can overcome the limitations of local testing environments, achieve faster test execution, and improve overall testing efficiency.

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Conclusion

Utilizing the Edge Driver in Selenium testing brings many benefits and features that enhance our automation experience with the Microsoft Edge browser. To understand and master the concept of the Edge driver, we have explored the following topics in our articles:

We looked at the benefits and features of the Edge driver brings to streamline our testing and automation process.
We then looked at how easy it is to set up and integrate the Edge driver with the Selenium framework to automate the Microsoft Edge browser using Python.
We also considered a real-world example to demonstrate how to automate a simple ToDo App on the Microsoft Edge browser using the Edge driver. In the example, we automated a todo app to “create todos,” “mark todos as completed,” and “delete completed todos.”
Finally, we wrapped up our article by having a sneak peek into how a cloud based automation testing tool like LambdaTest overcomes the challenges by providing scalable infrastructure and facilitating seamless collaboration.

Selenium WebDriver Architecture Explained — Ultimate Guide On What Is Selenium Architecture And How Does It Work

TanmayKumarDeo — Tue, 11 Jul 2023 07:42:12 +0000

When it comes to automation testing for web apps, a few frameworks in the market, like Selenium, Puppeteer, Cypress, Playwright, etc., make it to the ‘favored list’ of top automation frameworks. The choice of test automation framework counts on a range of parameters like language support, complexity, and scale, along with the framework expertise available within the testing team. However, it’s no wonder Selenium is still the most preferred framework among automation testers and developers.

Testing the web app against all odds is challenging, and we need a tool to help us in this process. One such primarily used tool by automation testers and developers is Selenium WebDriver. If you wish to know about Selenium Architecture internally, you have landed at the ideal place.

In this blog on Selenium Architecture, I will go into detail regarding Selenium Architecture and Selenium WebDriver; we will look at the working of Selenium WebDriver, its advantages, and limitations.

What is Selenium?

Selenium is an automation testing framework. It automates the testing of web applications on different browsers. Selenium empowers testers and developers to write automation test scripts effortlessly in multiple programming languages, like Java, Ruby, NodeJS, Python, C#, PHP, Perl, and many more.

Selenium supports cross browser testing on almost all popular web browsers, such as Google Chrome, Apple’s Safari, Mozilla Firefox, Microsoft Edge, Opera, etc., wherein the Selenium test scripts, written in different programming languages, can run smoothly. It also supports cross platform testing, i.e., the test cases can run simultaneously across multiple supported operating systems. The platforms supported by Selenium include Windows, Linux, Mac OS, and Solaris. Selenium is one of the top automation testing tools as it allows developers and automation testers to create flexible and robust automation test cases.

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What are the Components of Selenium?

As we already know, Selenium is not just a test automation framework. It is a suite of testing tools, and every tool in the suite has unique capabilities that help in the development and designing of automation frameworks. All these components can be used individually or can be paired with one another to achieve a greater deal. The Selenium framework mainly comprises four components as listed below:

Selenium IDE
Selenium WebDriver
Selenium RC(Obsolete now and merged with WebDriver)
Selenium Grid

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Now let us comprehend each of these components one by one briefly:

Selenium IDE

Selenium IDE refers to Selenium Integrated Development Environment. It is a Firefox plugin that allows testers and developers to record and playback test scripts. It does not require any prior programming understanding. Usually, the Selenium IDE is a prototyping tool.

Selenium WebDriver

Selenium WebDriver is one of the most important components of the entire Selenium framework that supports overall browser-based automation tests. WebDriver is the remote control interface component that allows test programs to instruct and interact with browsers, manipulate DOM elements in a web page, and control the user agent’s behavior. In a nutshell, it is the bridge between the Selenium framework and the browser over which the test cases run.

After Selenium 1, Selenium RC was merged with the Selenium WebDriver and formed Selenium 2. This was later upgraded to Selenium 3 and further to Selenium 4. We will learn about these in detail in the upcoming sections.

Selenium Grid

This component of the Selenium suite is used to run parallel tests on machines against multiple supported browsers. Since almost all modern browsers and operating systems are supported by Selenium, it is easier for the Selenium Grid to run numerous tests simultaneously on different operating systems with different browsers.

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Selenium Architecture

In this blog on Selenium Architecture so far, we have covered the basics of Selenium and its various components. Now, let’s try to understand the Architecture of Selenium WebDriver in a detailed manner.

As mentioned earlier, Selenium WebDriver and Selenium RC were merged into one single unit called Selenium 2.0 or Selenium WebDriver 2.0. Over time it has been constantly enhanced for more functionalities and features and was upgraded to Selenium 3.0. In Selenium 3.0, the primary mode of communication between the automation test script and web browser was the JSON Wire protocol.

With the introduction of Selenium 4.0, the JSON Wire protocol is replaced with the W3C protocol as the mode of communication. This means that encoding and decoding of test case requests are no longer required in Selenium 4.0. We will learn about these protocols in a detailed fashion in the upcoming sections. So, Let’s start with the Selenium Architecture of WebDriver in Selenium 3.0 and then look at the Selenium Architecture of WebDriver in Selenium 4.0.

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Selenium Architecture of WebDriver in Selenium 3.0

Selenium 3.0 primarily uses the JSON Wire protocol to communicate between the user test script and the browser. This wire protocol represents a RESTful web service using JSON over HTTP. In Selenium 3.0, the Selenium WebDriver architecture consists of four major components:

Selenium Client Libraries/ Language Bindings
JSON Wire Protocol
Browser Drivers
Real Browsers
The image below represents the Selenium Architecture of WebDriver in Selenium 3.0.

Now let us discuss each of these components in Selenium 3.0 one by one:

Selenium Client Libraries:

Automation scripts that interact with the Selenium framework through Selenium WebDriver, can be programmed in multiple programming languages such as Ruby, Java, C#, Python, Javascript, etc. Hence, Selenium developers have chosen to develop Selenium client libraries or language bindings that permit Selenium to support multiple languages.

A Selenium Client Library is nothing but a different kind of Jar file. It contains methods and classes of Selenium WebDriver that are required to create test automation scripts.

Selenium core libraries can be installed easily using package installers available with the respective languages. Also, all the supported Selenium client libraries can be downloaded from the official download page of Selenium.

A Selenium client library is not a testing framework but it provides an application programming interface (API), i.e., a set of functions that performs the Selenium commands from the test script. For example, Java bindings provide APIs to perform the Selenium commands written in the Java language.

JSON Wire Protocol

JSON or JavaScript Object Notation is a very famous data interchange format based on a subset of the JavaScript Programming Language. Selenium WebDriver 3.0 uses JSON to communicate between Selenium client libraries and browser drivers. It provides support for data structures like arrays and objects, making data reading and writing more comfortable.

The JSON requests sent by the client are altered into HTTP requests for the server to understand and converted back to JSON format while sending it back to the client again. This process of data transfer is serialization. In this method, the internal logic of the browser is not disclosed, and the server can communicate with the Selenium client libraries, even if it is unfamiliar with any programming language.

Browser Drivers

Browser drivers act as a bridge between the Selenium client libraries and the real browsers. They help us in running Selenium commands on the browser. It is the main component of Selenium WebDriver responsible for executing user actions, like mouse clicks, page navigation, button clicks, etc., on the browser. For every supported browser in Selenium, we have a unique browser driver. These browser drivers take commands from the Selenium test scripts and pass them to the respective browsers.

Whenever a Selenium automation test is triggered, the following series of actions are performed:

Every test command generates a corresponding HTTP request using the JSON Wire Protocol, which is then sent to the browser driver.
This HTTP request is routed through the HTTP Server.
The HTTP Server directly drives the command execution on the real browser.
The browser then sends back the test status to the HTTP Server, which is responsible for forwarding it to the test automation script.

In this way, these browser drivers permit communication between the Selenium automation script with different browsers. Also, the browser driver ensures that communication happens without disclosing the internal logic of those browsers.

Some popular browser drivers in Selenium are ChromeDriver, FirefoxDriver, SafariDriver, OperaBrowser, EdgeDriver, and HtmlUnitDriver.

Real Browsers

A real browser is an application or a software program used for searching and seeing content on the World Wide Web (WWW). This component of the Selenium Webdriver architecture in Selenium 3.0 is pretty straightforward. The browser receives the command and calls the respective functions or methods to perform the desired automation task.

Selenium framework supports almost all popular and modern-age browsers like Google Chrome, Mozilla Firefox, Microsoft Edge, Apple’s Safari, etc.

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Selenium Architecture of WebDriver in Selenium 4.0

In Selenium 3.0, JSON Wire protocol over HTTP was used as the medium of communication. The main weakness of this JSON Wire protocol was that there needed to be direct communication between the Selenium client libraries (C#, Java, Ruby, Python, etc..) and the browser driver. This protocol acts as a mediator between the client libraries and the WebDriver. This was so because the server didn’t understand the programming languages but only the protocols. This results in slower test execution, exceptions, and more possibilities of the test getting flaky.

This problem was solved with the introduction of W3C (World Wide Web Consortium) in Selenium WebDriver 4.0. In Selenium 4.0, WebDriver W3C Protocol supersedes the older JSON Wire protocol. This means that we no longer need to encode and decode the Selenium command or the API request. Using the W3C protocol and the automation scripts can directly communicate with the browser. The pieces of information will not be transferred by receiving and sending HTTP requests and HTTP responses, respectively.

The image below represents the Selenium Architecture of WebDriver in Selenium 4.0 onwards.

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In Selenium 4.0, the Selenium WebDriver architecture consists of the following four major components:

Selenium Client Libraries/ Language Bindings
WebDriver W3C Protocol
Browser Drivers
Real Browsers

Basically, all the components in Selenium WebDriver 4.0 are similar to the components in Selenium 3.0 except that the JSON Wire protocol is replaced with the new W3C WebDriver protocol. So, let’s discuss this protocol in detail.

WebDriver W3C Protocol

‘WebDriver W3C’ is the recently introduced protocol in Selenium 4.0. It has acquired an endorsement from W3C, the community which toils on web standards development. W3C Editor’s Draft and W3C Working Draft are tremendous resources for keeping a tab on the advancement of WebDriver W3C Protocol.

In WebDriver W3C Protocol, there is a direct information transfer between the server and client without the necessity for the JSON Wire Protocol. As both Selenium WebDriver and web browsers use the identical protocol, automated Selenium testing will run tests more consistently between various browsers.

With WebDriver W3C Protocol in action, developers or automation testers would no longer need to change the automation scripts to work across various web browsers. Consistency and stability in tests are the two significant advantages of WebDriver W3C protocol in Selenium 4.0.

Difference Between JSON Wire Protocol and WebDriver W3C Protocol

Till now we have clearly understood the Selenium Architecture in Selenium 3.0 and Selenium 4.0. This section will discuss the primary differences between the JSON Wire protocol used in Selenium 3.0 and the WEbDriver W3C protocol used in Selenium 4.0.

	JSON WIRE PROTOCOL	WEBDRIVER W3C PROTOCOL
Retirement	Permanently retired in Selenium 4.0.	Active and current protocol.
Role	This was mainly responsible for communication in Selenium WebDriver Architecture 3.0	Current protocol responsible for communication in Selenium WebDriver Architecture 4.0
Test Script Compatibility	JSON Wire protocol first converts the test commands into HTTP protocol and then communicates with the server to execute test actions.	With WebDriver W3C protocol test scripts can directly command the browser driver to execute test actions.
Test Execution Time	Because of the encoding and decoding of the commands in JSON, the test execution sometimes becomes very slow.	Test Execution is faster because of the direct interaction of test scripts with the browser driver.
Element Interactions	Element interactions have different implementations	Updated implementation using Actions API

Other than these differences, the WebDriver W3C protocol also introduced some changes in error codes, data structures, and response status codes. More detail on these changes can be found on the official Selenium Changelog page.

How Selenium WebDriver Works Internally?

In a real-time scenario, when we run a Selenium script written in any language using any one of the supported Selenium client libraries (say Java), the browser will launch and starts behaving as directed by the script. Now let’s understand what is occurring internally after the Run button is clicked till the launch of the real browser.

As we click on the Run button, the Selenium client library runs Selenium commands from the automation script and converts them in a serialized JSON format (for example https://www.lambdatest.com will be serialized to {“url”: “https://www.lambdatest.com”} )using JSON Wire protocol over HTTP sent to the browser driver (say ChromeDriver) for each command. Every browser driver uses the HTTP server to receive an HTTP request.
JSON Wire Protocol is responsible for communicating between any client and the server by sharing the data. The browser driver receives the HTTP request via the HTTP Server. This HTTP Server performs all the typical actions or instructions on the browser driver and then the browser driver will send a request to load the URL on the real browser.
After performing all instructions and commands, the execution status is sent back to HTTP Server over the HTTP. The browser driver furthermore uses the HTTP server to receive the HTTP request and then send it back to the client library via the JSON Wire Protocol.

In Selenium 4.0, the role of JSON Wire protocol is completely removed. And the browser driver directly communicates with the Selenium client libraries to execute various Selenium commands on the real browser.

Advantages of Selenium WebDriver W3C Protocol in Selenium 4.0

The introduction of WebDriver W3C protocol in Selenium 4.0 offers several advantages that include the following points:

The automated Selenium testing will run more stably and consistently across browsers as both the browsers and Selenium WebDriver is using the same protocol.
With WebDriver W3C Protocol, automated Selenium testing will be less unreliable and more stable. Stability in automation testing is a major reason to shift to Selenium 4.0.
The new WebDriver W3C protocol uses the Actions API, which is richer in comparison to the one in JSON Wire Protocol, to interact with the browser. Action APIs would now let us perform multi-touch actions, zoom-out, zoom-in, pressing two or more keys simultaneously, and many more.
For example, the Pinch-in sequence in W3C Protocol is defined by an action sequence consisting of three ticks with two-pointer devices of type-touch, each performing a series of actions pointerDown, followed by the pointerMove, and then pointerUp.
Standardization of W3C unlocks the opportunities for promoting compatibility beyond WebDriver API implementations.
Web applications with W3C compliance help in reducing maintenance efforts, as cleaner code results in enhanced readability.

Conclusion

After readings this detailed blog on Selenium Architecture, you will now have a better understanding of what Selenium Architecture is, the various components of the Selenium suite, how important the Selenium WebDriver is in the entire Selenium Architecture, and what is the Selenium architecture in Selenium 3.0 and 4.0. If you have carefully gone through this Selenium architecture tutorial. In that case, you will also be well-equipped with the following knowledge:

Selenium WebDriver is the main component of the entire Selenium suite. It is like the brain of Selenium. Selenium IDE, Selenium Grid, and Selenium RC (deprecated) are other components of the Selenium suite.
Selenium WebDriver mainly consists of the following components: Selenium client libraries, JSON Wire protocol, browser driver, and the real browser. The browser drivers present in the Selenium WebDriver help ease the suite’s interaction with multiple web browsers.
In Selenium 3.0 the JSON Wire protocol over HTTP was primarily used as a mode of communication between the Selenium client libraries and the browser driver. With the introduction of Selenium 4.0, this protocol was replaced with the new WebDriver W3C protocol.

Selenium is a reliable and robust framework for automated web app testing. However, its usage and throughput will be limited if used to test local infrastructure, which is neither economical nor scalable. To achieve better efficiency, scalability, and faster performance, go for cross browser testing in Selenium with a cloud-based digital experience testing platform such as LambdaTest and enjoy the wonderful outcomes.