5

Mockito 不会在带@BeforeAll注释的方法中使用 JUnit 5 初始化模拟运行。如果我将init's 方法注释更改为@BeforeEach. 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，为简洁起见省略其他）：

[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
4

2 回答 2

5

该类MockitoExtension实现BeforeEachCallback但不是BeforeAllCallback来自 JUnit-Jupiter-API。因此，它不为带@BeforeAll注释的方法提供任何额外的行为。

来源摘录MockitoExtension

public class MockitoExtension implements BeforeEachCallback, AfterEachCallback, ParameterResolver {
于 2021-01-02T22:04:07.753 回答
1

您缺少myMockedClass. 请注意，您不能@Mock为其使用注释，因为该@BeforeAll方法将在该注释用于初始化模拟对象之前运行，并且您必须求助于显式调用Mockito.mock：

@BeforeAll
public void init() {
    myMockedClass = mock(MyMockedClass.class); // Here
    when(myMockedClass.getSomething()).thenReturn(something);
}
于 2021-01-02T19:54:37.317 回答