Which annotation is used to run a method once after all tests in JUnit 5?

Java MCQ: Which annotation is used to run a method once after all tests in JUnit 5?

Answer:

Explanation:

The @AfterAll annotation in JUnit 5 is used to run a method once after all tests in the test class. This is useful for performing cleanup tasks that should only be done once, such as closing a database connection or releasing shared resources.

Here’s an example:

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

public class CalculatorTest {

    @AfterAll
    public static void tearDownAll() {
        // Code to clean up shared resources
    }

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

In this example, the tearDownAll() method is annotated with @AfterAll, meaning it will be executed once after all the test methods in the class have run. Like @BeforeAll, this method must be static because it is called after all tests have completed, before the test class is destroyed.

The @AfterAll annotation is ideal for tasks that require a single cleanup operation after all tests have been executed, ensuring that shared resources are properly released.

Reference links:

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