🧪 JUnit 4 & JUnit 5 Testing Project

This repository demonstrates unit testing in Java using JUnit 4 and JUnit 5 (Jupiter) frameworks.
It includes practical examples of writing, running, and managing test cases for Java classes like Calculator.
The project highlights the differences between JUnit 4 and JUnit 5 annotations, execution flow, and assertion handling.

---

📘 Overview

• Language: Java
• Frameworks: JUnit 4 & JUnit 5
• Build Tool: Maven
• IDE Used: Eclipse

The project contains two main test classes:

1. CalculatorServiceTest — implemented using JUnit 4
2. CalculatorServiceTestJUnit5 — implemented using JUnit 5 (Jupiter)

---

⚙️ Features

• Demonstrates setup and teardown methods
  • @BeforeClass, @AfterClass, @Before, @After (JUnit 4)
  • @BeforeAll, @AfterAll, @BeforeEach, @AfterEach (JUnit 5)
• Assertion handling with Assert and Assertions
• Timeout testing in JUnit 4
• Test disabling with @Disabled in JUnit 5
• Use of @DisplayName for custom test case names
• Demonstrates both static and instance-level lifecycle methods

---

🧩 Technologies Used

Technology	Purpose
Java (JDK 8+)	Core language for implementation
JUnit 4 (v4.13.2)	Classic testing framework
JUnit 5 (Jupiter v5.10.0)	Modern testing platform with enhanced features
Maven	Build and dependency management

---

📦 Maven Dependencies

Add these to your pom.xml:

<!-- JUnit 4 Dependency -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13.2</version>
    <scope>test</scope>
</dependency>

<!-- JUnit 5 Dependency -->
<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter</artifactId>
    <version>5.10.0</version>
    <scope>test</scope>
</dependency>

---

🚀 How to Run Tests

1. Open the project in Eclipse or IntelliJ IDEA.
2. Run JUnit 4 Tests:
   • Right-click on CalculatorServiceTest.java → Run As → JUnit Test (Ensure the test runner is set to JUnit 4)
3. Run JUnit 5 Tests:
   • Right-click on CalculatorServiceTestJUnit5.java → Run As → JUnit Test (JUnit 5 automatically detects lifecycle annotations and extensions)

---

🧠 Example Output (JUnit 5)

This is single time logic
Before Each
First Test Case
After Each
After All The Test Case Logic

🧮 Example Test Snippet

@Test
@DisplayName("This is custom name")
public void addTwoNumbersTest() {
    System.out.println("First Test Case");
    int actual = Calculator.addTwoNumbers(12, 12);
    int expected = 24;
    Assertions.assertEquals(expected, actual, () -> "Not Matched");
}

🧰 Project Structure

src
├── main
│   └── java
│       └── com
│           └── lcwd
│               └── services
│                   └── Calculator.java
└── test
    └── java
        └── com
            └── lcwd
                └── services
                    ├── CalculatorServiceTest.java        # JUnit 4
                    └── CalculatorServiceTestJUnit5.java   # JUnit 5

---

👨‍💻 Author Shubham Pathak 🎓 Sharda University | 💻 Java Developer | ☕ Tech Enthusiast 📧 shubhammpathak566@gmail.com