Mockito Verify Cookbook

1. 概述

本文主要介绍如何在各种用例中使用Mockito verify。

旨在以案例为中心且实用，不需要多余的细节和解释。

我们将mock一个简单的List实现：

public class MyList extends AbstractList<String> {

    @Override
    public String get(final int index) {
        return null;
    }

    @Override
    public int size() {
        return 0;
    }
}

2. 案例

验证mock上的简单调用：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void givenInteractionWithMockOccurred_whenVerifyingInteraction_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.size();
        verify(mockedList).size();
    }
}

验证与mock的交互次数：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void givenOneInteractionWithMockOccurred_whenVerifyingNumberOfInteractions_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.size();
        verify(mockedList, times(1)).size();
    }
}

验证与整个mock没有发生交互：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void givenNoInteractionWithMockOccurred_whenVerifyingInteractions_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        verifyNoInteractions(mockedList);
    }
}

验证没有与特定方法发生交互：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void givenNoInteractionWithMethodOfMockOccurred_whenVerifyingInteractions_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        verify(mockedList, times(0)).size();
    }
}

验证没有期望的交互，此操作应失败：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void givenUnverifiedInteraction_whenVerifyingNoUnexpectedInteractions_thenFail() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.size();
        mockedList.clear();

        verify(mockedList).size();
        assertThrows(NoInteractionsWanted.class, () -> verifyNoMoreInteractions(mockedList));
    }
}

验证交互顺序：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void whenVerifyingOrderOfInteractions_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.size();
        mockedList.add("a parameter");
        mockedList.clear();

        final InOrder inOrder = Mockito.inOrder(mockedList);
        inOrder.verify(mockedList).size();
        inOrder.verify(mockedList).add("a parameter");
        inOrder.verify(mockedList).clear();
    }
}

验证没有发生交互：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void whenVerifyingAnInteractionHasNotOccurred_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.size();

        verify(mockedList, never()).clear();
    }
}

验证交互至少/至多发生了一定次数：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void whenVerifyingAnInteractionHasOccurredAtLeastOnce_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.clear();
        mockedList.clear();
        mockedList.clear();

        verify(mockedList, atLeast(1)).clear();
        verify(mockedList, atMost(10)).clear();
    }
}

验证与确切参数的交互：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void whenVerifyingAnInteractionWithExactArgument_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.add("test");

        verify(mockedList).add("test");
    }
}

验证与任何参数的交互：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void whenVerifyingAnInteractionWithAnyArgument_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.add("test");

        verify(mockedList).add(anyString());
    }
}

验证交互使用参数捕获：

class MockitoVerifyExamplesUnitTest {

    @Test
    final void whenVerifyingAnInteractionWithArgumentCapture_thenCorrect() {
        final List<String> mockedList = mock(MyList.class);
        mockedList.addAll(Lists.newArrayList("someElement"));

        final ArgumentCaptor<List<String>> argumentCaptor = ArgumentCaptor.forClass(List.class);
        verify(mockedList).addAll(argumentCaptor.capture());

        final List<String> capturedArgument = argumentCaptor.getValue();
        assertThat(capturedArgument).contains("someElement");
    }
}

3. 总结

所有这些案例和代码的实现都可以在我的GitHub上找到。这是一个基于Maven的项目，因此可以直接导入并运行。

与往常一样，本教程的完整源代码可在GitHub上获得。

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1. 概述

2. 案例

3. 总结

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