JUnit 5 is the next generation of JUnit testing framework. It provides a more flexible and extensible testing platform.

Writing a Simple Test

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

public class CalculatorTest {
    @Test
    void testAddition() {
        Calculator calc = new Calculator();
        assertEquals(4, calc.add(2, 2));
    }
}

Key Features

• Parameterized tests
• Dynamic tests
• Better organizations with nested tests
• Enhanced assertions
• Extension model

Writing comprehensive unit tests helps ensure code quality and prevents regressions.