[Part 4]Data Structures in TypeScript – Organizing Test Data with Strong Typing

Introduction

Effective data management is key in test automation. This module covers TypeScript data structures such as arrays, objects, tuples, and enums, which enhance test data organization and maintainability.

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Lesson 1: Arrays in TypeScript – Managing Test Case Lists Efficiently

Concept:
Arrays allow storing multiple test cases, results, or input values in a structured manner.

Key Topics:

• Array Creation: Declaring and initializing typed arrays.
• Array Methods: Using .map(), .filter(), and .forEach() in test scripts.
• Multi-Dimensional Arrays: Organizing test data efficiently.

Example:

let testCases: string[] = ["Login", "Signup", "Checkout"];
testCases.push("Password Reset"); // Adding a test case
console.log(testCases);

Pro Tip: Use readonly arrays for test data that should not be modified.

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Lesson 2: Objects in TypeScript – Defining Structured Test Configurations

Concept:
Objects allow defining structured data models for storing test configurations.

Key Topics:

• Defining Objects: Creating key-value pairs for test metadata.
• Interfaces and Type Aliases: Structuring reusable object definitions.
• Nested Objects: Organizing complex test configurations.

Example:

type TestConfig = {
    testName: string;
    retries: number;
    isParallel: boolean;
};

let config: TestConfig = { testName: "Login Test", retries: 2, isParallel: true };

Pro Tip: Use interfaces for consistency when defining test configurations.

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Lesson 3: Array Methods and Object Properties – Efficient Data Handling

Concept:
Using built-in array and object methods simplifies data processing in test automation.

Key Topics:

• Array Methods: filter(), map(), and reduce().
• Object Methods: Object.keys(), Object.values(), Object.assign().
• Iterating Over Data: Using loops to process large test datasets.

Example:

let results = [
    { test: "Login", status: "Passed" },
    { test: "Signup", status: "Failed" }
];
let passedTests = results.filter(r => r.status === "Passed");
console.log(passedTests);

Pro Tip: Use map() to transform test results into report-ready formats.

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Lesson 4: Working with Tuples and Enums for Test Data Representation

Concept:
Tuples and enums provide additional structure to test automation data.

Key Topics:

• Tuples: Fixed-length arrays with different data types.
• Enums: Defining a set of named constants for test statuses.
• Use Cases: Representing test results, priorities, and categories.

Example:

type TestResult = [string, boolean];
let loginTest: TestResult = ["Login Test", true];

enum Status {
    Passed = "Passed",
    Failed = "Failed",
    Skipped = "Skipped"
}
console.log(Status.Passed);

Pro Tip: Use enums for defining test result statuses to ensure consistency.

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Conclusion

This module explored TypeScript data structures that help in organizing and managing test data efficiently.

Key Takeaways:

• Arrays store collections of test cases and results.
• Objects provide structured data storage with defined properties.
• Built-in array and object methods optimize data processing.
• Tuples and enums enforce structure and clarity in test data representation.

What’s Next?
In the next module, we will dive into Functions and Modules – Writing Reusable and Modular TypeScript QA Code, where we will explore function creation, modularization, and npm integration for optimized test automation.

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