DEV Community: Vignesh

Task18

Vignesh — Mon, 29 Apr 2024 16:44:11 +0000

Describe the Python Selenium architecture in detail?

What is the significance of the Python Virtual Environment? Give Some Example to support your answer?

Python Selenium Architecture:

Selenium WebDriver stands as a widely utilized open-source library and integral element within the Selenium automation framework. Its primary function involves automating the testing procedures for web applications. This technology comprises a set of APIs that provide a programming interface, empowering developers, and testers to craft scripts in diverse programming languages like Java, JavaScript, C#, Python, etc. These scripts are designed to automate actions within web browsers and extract information from web pages. WebDriver operates by replicating user actions, navigating across web pages, engaging with various elements (ranging from buttons, text fields, dropdown menus, forms, links, etc.), submitting forms, executing validations, performing assertions, and executing numerous other functions through test scripts.

The architecture of Selenium WebDriver (Selenium 3) comprises four primary components:

Selenium Client library: The Selenium Client Library encompasses languages such as Java, Ruby, Python, C#, and more. Once the test cases are initiated, the complete Selenium code will be transformed into JSON format.

JSON wire protocol over HTTP: JSON stands for JavaScript Object Notation, handling the transmission of information from the server to the client. The JSON Wire Protocol predominantly manages the transfer of data between HTTP servers. The produced JSON is accessible to browser drivers via the HTTP protocol.

Browser Drivers: Selenium’s browser drivers are inherently specific to each browser, establishing secure connections and enabling interaction with the browser. Selenium extends support for various browser drivers such as ChromeDriver, GeckoDriver, Microsoft Edge WebDriver, SafariDriver, and InternetExplorerDriver.

Browsers: One of the greatest advantages of Selenium WebDriver is its compatibility with all major browsers including Firefox, Google Chrome, Apple Safari, IE, Edge, and Opera. Each browser has its dedicated WebDriver for running automation scripts.

Selenium WebDriver Architecture

Python Virtual Environment:

A Python virtual environment refers to an independent Python environment enabling the management of distinct dependencies for individual Python projects. Creating a Python virtual environment for each project guarantees that it will possess its necessary requirements without any interference from other projects.

What is the reason behind using a Python Virtual Environment?

While working with Python, we might find the need to install packages and modules that aren’t included in the standard library. Employing ‘pip install –user some_package’ enables the installation of Python packages in your home directory. However, potential issues may arise later regarding package dependencies.

Eg:

If developers are simultaneously handling two different projects — Project A requiring version 1.0 of a library and Project B necessitating version 2.0 of the same library — installing the dependency for Project B could potentially disrupt Project A. To circumvent this issue, creating separate virtual environments for each project is a simple solution. These virtual environments remain isolated from one another, allowing you to install dependencies for one project without concerns about affecting the other.

Functioning principle of a virtual environment

Installing virtualenv:

$ pip install virtualenv

Test the installation:

$ virtualenv — version

Creating a virtualenv using the following command:

$ virtualenv dir_name

*dir_name- Directory name

To create a Python 3 virtual environment, use the following command:

$ virtualenv -p /usr/bin/python3.X virtualenv_name

Deactivate a Python virtualenv:

(virtualenv_name)$ deactivate

Task-15

Vignesh — Mon, 29 Apr 2024 14:47:46 +0000

What is selenium? Why do we use selenium for automation?

What is Selenium?

Selenium represents an open-source framework utilized for automated testing within the software development domain. It presents an array of tools designed to automate web browsers, simplifying the process of testing web applications for performance, compatibility, and functionality. One of Selenium’s primary strengths is its compatibility with various programming languages such as Java, Python, C#, Ruby, among others. This enables testers and developers to employ Selenium’s capabilities within their preferred programming environment and language of expertise.

Why do we use Selenium for automation ?

Multi language support: Selenium supports multiple languages like Ruby, Java, PHP, Perl, Python, JavaScript, C# to create test scripts.

Cross Browser support: The most widely used browsers in today’s world are Chrome, Firefox, Safari, Internet Explorer, Opera, and Edge. All the browsers are compatible with Selenium and hence we can use the same test script to test an application across multiple browsers to ensure it is working fine without having to change the scripts.

Scalability: The automation scripts in Selenium enable the coverage of wide range of test cases and scenarios and this feature ensures the maximum test coverage of applications functionality.

Reusable Test Scripts: Selenium enables testers to create reusable test scripts that help save time and effort.

Parallel Testing: Selenium supports parallel test execution allowing multiple tests to run concurrently which helps reduce the overall testing time. Selenium Grid id useful for parallel testing.

Framework availability: Frameworks in selenium facilitate easy code maintenance, improving code reusability, easy portability, lowering the cost of script maintenance,

and improving the readability of the code. Some of the frameworks include hybrid framework, data driven framework and keyword driven framework.

User Experience Testing: Selenium can simulate user interactions and behaviour, allowing testers to assess the user experience and ensure that the application is intuitive and user-friendly.

Documentation and Reporting: Selenium provides detailed test execution logs and reports making it easier to track the results.

*Continuous Integration and Continuous Deployment (CI/CD): * Selenium can be integrated into CI/CD pipelines to automate the testing of each code change.

Components of selenium:

· Selenium IDE
· Selenium RC
· Selenium WebDriver
· Selenium Grid

Selenium IDE (Integrated Development Environment):

This is primarily used for recording and playback for creating the selenium test cases for the user actions like clicks, selection etc. who is new to automation.

Selenium RC (Remote Controller):

This helps to design test scripts in any language of our choice. Server and client libraries are the two main components of selenium RC. The selenium RC has the following limitations.

· Browser Limitations: Selenium RC had to work with browsers using a JavaScript-based “proxy” mechanism, which introduced potential instability and limitations.

· Speed and Performance: The use of a JavaScript proxy added overhead and affected the speed and performance of test execution.

· Maintenance and Compatibility: Selenium RC required separate “drivers” for each browser, making maintenance and compatibility challenging as browser version changes for every update.

· Synchronization Issues: Selenium RC often faced synchronization problems, where test scripts had to wait for the browser to respond before proceeding to the next step.

· Complex Setup: Setting up Selenium RC involved multiple components, which could be complex and difficult to configure correctly.

Selenium WebDriver:

Selenium WebDriver is the enhanced version of Selenium RC to overcome its limitations. WebDriver communicates with browsers directly with the help of browser-specific native methods.

Selenium Grid:

Selenium grid allows users to run tests on different machines with different browsers and OS simultaneously.

Task15

Vignesh — Mon, 29 Apr 2024 14:46:22 +0000