Which annotation is used to run a method after each test in JUnit 5?

Java MCQ: Which annotation is used to run a method after each test in JUnit 5?

Answer:

Explanation:

The @AfterEach annotation in JUnit 5 is used to run a method after each test method in the test class. This is useful for cleaning up resources, resetting state, or performing any other necessary teardown tasks after each test has run.

Here’s an example:

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;

public class CalculatorTest {

    private Calculator calc;

    @BeforeEach
    public void setUp() {
        calc = new Calculator();
    }

    @AfterEach
    public void tearDown() {
        calc = null;  // Clean up after each test
    }

    @Test
    public void testAdd() {
        int result = calc.add(2, 3);
        assertEquals(5, result);
    }
}

In this example, the tearDown() method is annotated with @AfterEach, which means it will be run after each test method in the class. The tearDown() method sets the Calculator instance to null, effectively cleaning up resources used during the test.

The @AfterEach annotation ensures that any necessary cleanup is performed after each test, helping to maintain test isolation and prevent side effects between tests.

Reference links:

https://junit.org/junit5/
JUnit Tutorial