java - 在@BeforeAll 注释方法中使用 JUnit 5 运行的测试中，Mockito 不会初始化模拟

Question

Mockito 不会在 @BeforeAll 注释方法中使用 JUnit 5 初始化模拟运行。
如果我将 init 方法注释更改为 @BeforeEach，它会起作用。测试在 IntelliJ IDEA 中运行。
我的测试课:

@ExtendWith(MockitoExtension.class)
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class MyTest {
    
    private MyMockedClass myMockedClass;

    @BeforeAll
    public void init() {
        when(myMockedClass.getSomething()).thenReturn(something); // Mock is not initialized, getting NPE on test

依赖关系(仅显示相关的，为简洁起见省略了其他的):

[INFO] --- maven-dependency-plugin:2.10:tree (default-cli) @ XXX ---
[INFO] +- org.mockito:mockito-core:jar:3.6.28:test
[INFO] |  +- net.bytebuddy:byte-buddy:jar:1.10.18:compile
[INFO] |  +- net.bytebuddy:byte-buddy-agent:jar:1.10.18:test
[INFO] |  \- org.objenesis:objenesis:jar:3.1:test
[INFO] +- org.mockito:mockito-junit-jupiter:jar:3.6.28:test
[INFO] |  \- org.junit.jupiter:junit-jupiter-api:jar:5.7.0:test
[INFO] |     +- org.apiguardian:apiguardian-api:jar:1.1.0:test
[INFO] |     +- org.opentest4j:opentest4j:jar:1.2.0:test
[INFO] |     \- org.junit.platform:junit-platform-commons:jar:1.7.0:test
[INFO] +- org.springframework.boot:spring-boot-starter-test:jar:2.4.1:test
[INFO] |  +- org.junit.jupiter:junit-jupiter:jar:5.7.0:test
[INFO] |  |  +- org.junit.jupiter:junit-jupiter-params:jar:5.7.0:test
[INFO] |  |  \- org.junit.jupiter:junit-jupiter-engine:jar:5.7.0:test
[INFO] |  |     \- org.junit.platform:junit-platform-engine:jar:1.7.0:test

Answer 1

MockitoExtension类实现了 BeforeEachCallback但不是 BeforeAllCallback来自 JUnit-Jupiter-API。因此它不会为 @BeforeAll 提供任何额外的行为。注释的方法。
MockitoExtension 的来源摘录

public class MockitoExtension implements BeforeEachCallback, AfterEachCallback, ParameterResolver {