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Testing / JUnit6 Interview Questions

What are the core annotations in JUnit 6 and what does each do?

The JUnit 6 annotation model is unchanged from JUnit 5 Jupiter -- this is by design, making migration from JUnit 5 to JUnit 6 primarily a version bump rather than an annotation rewrite.

Core JUnit 6 annotations
AnnotationPurposeNotes
@TestMarks a method as a test caseNo parameters; replaces JUnit 4's @Test
@BeforeEachRuns before each test methodReplaces JUnit 4's @Before
@AfterEachRuns after each test methodReplaces JUnit 4's @After
@BeforeAllRuns once before all tests in the classMust be static unless @TestInstance(PER_CLASS)
@AfterAllRuns once after all tests in the classMust be static unless @TestInstance(PER_CLASS)
@DisabledSkips the annotated test or classReplaces JUnit 4's @Ignore
@DisplayNameCustom display name for the testSupports Unicode, emojis, spaces
@NestedMarks an inner class as a nested test classEnables hierarchical test organisation
@TagCategorises tests for filteringReplaces JUnit 4's @Category
import org.junit.jupiter.api.*;
import static org.junit.jupiter.api.Assertions.*;

@DisplayName("Order service tests")
class OrderServiceTest {

    OrderService service;

    @BeforeAll
    static void initAll() {
        System.out.println("Runs once before all tests");
    }

    @BeforeEach
    void setUp() {
        service = new OrderService();
    }

    @Test
    @DisplayName("New order has PENDING status")
    void newOrderIsPending() {
        Order order = service.create("item-1", 2);
        assertEquals(Status.PENDING, order.getStatus());
    }

    @Test
    @Disabled("Not implemented yet")
    void cancelledOrderIsRefunded() {
        // TODO
    }

    @AfterEach
    void tearDown() {
        service = null;
    }

    @AfterAll
    static void tearDownAll() {
        System.out.println("Runs once after all tests");
    }
}

Which JUnit 6 annotation replaces JUnit 4's @Ignore?
What constraint applies to @BeforeAll and @AfterAll methods by default in JUnit 6?

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