Code sample showing how to implement before all and after all callbacks for nested test classes.

BeforeAllForNestedTest.java

import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.*;

@Slf4j
public class OuterTest {

    @BeforeAll
    static void outerInitAll() {
        log.info("OUTER: Initializing external resources...");
    }

    @BeforeEach
    void outerInit() {
        log.info("OUTER: Initializing mock objects...");
    }

    @Test
    void outerTest() {
        log.info("OUTER: executing test");
    }

    @Nested
    class InnerTest extends InnerInitializer {

        @BeforeEach
        void innerInit() {
            log.info("INNER: Initializing mock objects...");
        }

        @Test
        void innerTest() {
            log.info("INNER: executing test");
        }

        @AfterEach
        void innerTearDown() {
            log.info("INNER: Tearing down...");
        }

    }

    static class InnerInitializer {

        @BeforeAll
        static void innerInitAll() {
            log.info("INNER: Initializing external resources...");
        }

        @AfterAll
        static void innerTearDownAll() {
            log.info("INNER: Freeing external resources...");
        }
    }

    @AfterEach
    void outerTearDown() {
        log.info("OUTER: Tearing down...");
    }

    @AfterAll
    static void outerTearDownAll() {
        log.info("OUTER: Freeing external resources...");
    }

}