Mockito：在没有@runwith(MockitoJunitRunner.class)的情况下是否启用了框架使用的验证

Question

我的代码：

public class MealTransformerTest {

MealTransformer mealTransformer = new MealTransformer();

@Test(expectedExceptions = NotImplementedException.class)
public void shouldThrowException() throws NotImplementedException {
    mealTransformer.transform(any(),
            any(),
            any(),
            any());
}

}在这个特定的测试中没有失败，但是当我运行这个套件时，Mockito会告诉我不正确使用匹配器的情况。

我也可以做一些类似的事情：

public class MealTransformerTest {

MealTransformer mealTransformer = new MealTransformer();

//I don't need it in the tests. But I need at least 1 @Mock or @Spy to trigger framework validation
@Mock
private CloneUtils cloneUtils;

@BeforeMethod
void setUp() {
    MockitoAnnotations.initMocks(this);
}


@Test(expectedExceptions = NotImplementedException.class)
public void shouldThrowException() throws NotImplementedException {
    mealTransformer.transform(any(),
            any(),
            any(),
            any());
}

@Test(expectedExceptions = NotImplementedException.class)
public void shouldThrowException123() throws NotImplementedException {
    mealTransformer.transform(any(),
            any(),
            any(),
            any());
}
}

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 
Misplaced argument matcher detected here:
....

Answer 1

匹配器通过副作用和静态全局状态工作，所以您可以将这个调用分解成几个部分来查看发生了什么。

MockitoAnnotations.initMocks(this);
// in @Before [1]

mealTransformer.transform(any(), any(), any(), any());
//              [6]       [2]    [3]    [4]    [5]

在init[1]之后，Java会看到四个对any[2-5]的调用和一个对transform[6]的调用。但是，Mockito只看到对Any的四个调用；因为mealtransformers不是mock，Mockito看不到它的调用。如果您单独运行该测试，Mockito将剩下四个记录的匹配器，这些匹配器没有被消耗。JVM将拆除测试框架，测试将通过-除非在@after方法中调用validateMockitousage，该方法将准确地捕捉到这种情况。

然而，当您有两个测试时，它们是这样叠加的：

MockitoAnnotations.initMocks(this);
// [1]
mealTransformer.transform(any(), any(), any(), any());
//              [6]       [2]    [3]    [4]    [5]
// test passes! now the next test
MockitoAnnotations.initMocks(this);
// [7]
mealTransformer.transform(any(), any(), any(), any());
//              [12]      [8]    [9]    [10]   [11]