JUnit Lifecycle Test

defaultLifecycleTest.java

import org.junit.jupiter.api.*;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class LifeCycleTest {
    private int count = 0;

    LifeCycleTest() {
        System.out.println("construct");
    }

    @BeforeAll
    static void beforeAll() {
        System.out.println("@BeforeAll");
    }

    @BeforeEach
    void beforeEach() {
        count += 1;
        System.out.println("@BeforeEach (count += 1): " + count);
    }

    @AfterEach
    void afterEach() {
        System.out.println("@AfterEach");
    }

    @AfterAll
    static void afterAll() {
        System.out.println("@AfterAll");
    }

    @Test
    void test1() {
        assertEquals(count, 1);
        System.out.println("@Test : test1");
    }

    @Test
    void test2() {
        assertEquals(count, 1);
        System.out.println("@Test : test2");
    }

    @Test
    void test3() {
        assertEquals(count, 1);
        System.out.println("@Test : test3");
    }
}

/*
[Output]

@BeforeAll
construct
@BeforeEach (count += 1): 1
@Test : test1
@AfterEach
construct
@BeforeEach (count += 1): 1
@Test : test2
@AfterEach
construct
@BeforeEach (count += 1): 1
@Test : test3
@AfterEach
@AfterAll
*/

perClassLifecycleTest.java

import org.junit.jupiter.api.*;

import static org.junit.jupiter.api.Assertions.assertEquals;

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class LifeCycleTest {
    private int count = 0;

    LifeCycleTest() {
        System.out.println("construct");
    }

    @BeforeAll
    void beforeAll() {
        System.out.println("@BeforeAll");
    }

    @BeforeEach
    void beforeEach() {
        count += 1;
        System.out.println("@BeforeEach (count += 1): " + count);
    }

    @AfterEach
    void afterEach() {
        System.out.println("@AfterEach");
    }

    @AfterAll
    void afterAll() {
        System.out.println("@AfterAll");
    }

    @Test
    @Order(1)
    void test1() {
        assertEquals(count, 1);
        System.out.println("@Test : test1");
    }

    @Test
    @Order(2)
    void test2() {
        assertEquals(count, 2);
        System.out.println("@Test : test2");
    }

    @Test
    @Order(3)
    void test3() {
        assertEquals(count, 3);
        System.out.println("@Test : test3");
    }
}

/*
[Output]

construct
@BeforeAll
@BeforeEach (count += 1): 1
@Test : test1
@AfterEach
@BeforeEach (count += 1): 2
@Test : test2
@AfterEach
@BeforeEach (count += 1): 3
@Test : test3
@AfterEach
@AfterAll
*/