Mockito 验证方法调用的顺序/序列

InOrder 可帮助您做到这一点。

ServiceClassA firstMock = mock(ServiceClassA.class);
ServiceClassB secondMock = mock(ServiceClassB.class);

Mockito.doNothing().when(firstMock).methodOne();   
Mockito.doNothing().when(secondMock).methodTwo();  

//create inOrder object passing any mocks that need to be verified in order
InOrder inOrder = inOrder(firstMock, secondMock);

//following will make sure that firstMock was called before secondMock
inOrder.verify(firstMock).methodOne();
inOrder.verify(secondMock).methodTwo();

请注意，您还可以使用 InOrder 类来验证是否在单个模拟上按顺序调用各种方法，而不仅仅是在两个或多个模拟上。

假设我有两个类 Foo 和 Bar：

public class Foo {
  public void first() {}
  public void second() {}
}

public class Bar {
  public void firstThenSecond(Foo foo) {
    foo.first();
    foo.second();
  }
}

然后我可以添加一个测试类来测试 Bar 的 firstThenSecond() 方法实际调用 first()，然后是 second()，而不是 second()，然后是 first()。请看以下测试代码：

public class BarTest {
  @Test
  public void testFirstThenSecond() {
    Bar bar = new Bar();
    Foo mockFoo = Mockito.mock(Foo.class);
    bar.firstThenSecond(mockFoo);

    InOrder orderVerifier = Mockito.inOrder(mockFoo);
    // These lines will PASS
    orderVerifier.verify(mockFoo).first();
    orderVerifier.verify(mockFoo).second();

    // These lines will FAIL
    // orderVerifier.verify(mockFoo).second();
    // orderVerifier.verify(mockFoo).first();
  }
}

是的，这在文档中有所描述。您必须使用 InOrder 类。

示例（假设已经创建了两个模拟）：

InOrder inOrder = inOrder(serviceAMock, serviceBMock);

inOrder.verify(serviceAMock).methodOne();
inOrder.verify(serviceBMock).methodTwo();

对于 Kotlin 用户，您可以这样：

class MyTrackerTest {
    private val trackEventUseCase: TrackEventUseCase = mock()
    private val sut = MyTracker(trackEventUseCase)

    @Test
    fun `trackSomething SHOULD invoke tracker use case twice with correct event names WHEN called`() {
        sut.trackSomething()

        trackEventUseCase.inOrder {
            verify().invoke("Is it August?")
            verify().invoke("No!")
        }
    }

}

使用 BDD

@Test
public void testOrderWithBDD() {


    // Given
    ServiceClassA firstMock = mock(ServiceClassA.class);
    ServiceClassB secondMock = mock(ServiceClassB.class);

    //create inOrder object passing any mocks that need to be verified in order
    InOrder inOrder = inOrder(firstMock, secondMock);

    willDoNothing().given(firstMock).methodOne();
    willDoNothing().given(secondMock).methodTwo();

    // When
    firstMock.methodOne();
    secondMock.methodTwo();

    // Then
    then(firstMock).should(inOrder).methodOne();
    then(secondMock).should(inOrder).methodTwo();


}