Learn Test Driven Development (TDD)

Welcome to the TDD learning module! This guide will help you understand the basics of Test Driven Development using Java and JUnit.

How to Start

Setting Up JUnit 5 in VS Code

1. Install Java Extension Pack:

   • Make sure you have the Java Extension Pack installed in VS Code. You can find and install it from the Extensions view (Ctrl+Shift+X).

2. Project Setup:

   • Create a new folder for your project.
   • Inside the project folder, create a subfolder named src.
   • Within src, create two subfolders: main and test.
   • Your main Java classes will go in src/main and your test classes in src/test.

3. Add JUnit 5 Dependency:

   • If you're using Maven, add the JUnit 5 dependencies to your pom.xml.

     <dependency>
         <groupId>org.junit.jupiter</groupId>
         <artifactId>junit-jupiter-api</artifactId>
         <version>5.7.0</version>
         <scope>test</scope>
     </dependency>
     <dependency>
         <groupId>org.junit.jupiter</groupId>
         <artifactId>junit-jupiter-engine</artifactId>
         <version>5.7.0</version>
         <scope>test</scope>
     </dependency>

   • If you're using Gradle, add the following to your build.gradle:

     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'

   • If you're using Gradle.kts, add the following to your build.gradle:

     testImplementation("org.junit.jupiter:junit-jupiter-api:5.7.0")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.7.0")

4. Create Your Test Class:

   • Write your test cases using JUnit 5 annotations (@Test, @BeforeEach, etc.) in the src/test folder.
   • Ensure each test method tests a specific behavior of your code.

Recommended IDEs

While this guide uses VS Code for simplicity, consider using dedicated IDEs for Java development such as:

• IntelliJ IDEA Community Edition
• Eclipse
• NetBeans

These IDEs provide powerful features like integrated debugging, intelligent code completion, and seamless integration with build tools like Maven and Gradle.

But if you are using VS Code Don't forget to check How to Start folder.

TDD Basics

The TDD-Basics folder contains a basic calculator program. The goal is to practice writing test cases before implementing the functions. This approach helps you:

• Define clear requirements through tests.
• Write code that fulfills those requirements.
• Refactor code confidently while ensuring tests remain passing.

Practice Questions

Explore the TDD-Questions folder for additional exercises to reinforce your understanding of TDD principles. After practicing you can check the Solutions folder to find the Solutions of all Questions.

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Start practicing TDD today to improve your code quality and development efficiency!

@Ashish-CodeJourney