mock框架官方文档地址:https://javadoc.io/static/org.mockito/mockito-core/3.2.0/org/mockito/Mockito.html#verification

1. Mock一个对象

 //Let's import Mockito statically so that the code looks clearerimport static org.mockito.Mockito.*;//mock creationList mockedList = mock(List.class);//using mock objectmockedList.add("one");mockedList.clear();//verificationverify(mockedList).add("one");verify(mockedList).clear();

2.添加预期返回结果

 //You can mock concrete classes, not just interfacesLinkedList mockedList = mock(LinkedList.class);//stubbing 设置预期值,获取第一个值返回"first",获取第二个值时抛出异常when(mockedList.get(0)).thenReturn("first");when(mockedList.get(1)).thenThrow(new RuntimeException());//following prints "first"System.out.println(mockedList.get(0));//following throws runtime exceptionSystem.out.println(mockedList.get(1));//following prints "null" because get(999) was not stubbedSystem.out.println(mockedList.get(999));

3.校验方法入参

 //stubbing using built-in anyInt() argument matcher  //设置预期返回结果 输入任何int类型的值都返回 "element"when(mockedList.get(anyInt())).thenReturn("element");//stubbing using custom matcher (let's say isValid() returns your own matcher implementation):
// 设置预期结果  调用contains()方法时返回 truewhen(mockedList.contains(argThat(isValid()))).thenReturn(true);//following prints "element"System.out.println(mockedList.get(999));//you can also verify using an argument matcherverify(mockedList).get(anyInt());

如果对一个方法使用了参数校验,那么这个方法的所有参数都要进行校验

    //above is correct - eq() is also an argument matcher  这个方法的所有参数都进行了校验,正确verify(mock).someMethod(anyInt(), anyString(), eq("third argument"));//above is incorrect - exception will be thrown because third argument is given without an argument matcher. 这个方法的第三个入参没有进行校验,不正确verify(mock).someMethod(anyInt(), anyString(), "third argument");

4.校验调用次数,至少xx次,没有调用

 //using mockmockedList.add("once");mockedList.add("twice");mockedList.add("twice");mockedList.add("three times");mockedList.add("three times");mockedList.add("three times");//following two verifications work exactly the same - times(1) is used by default//默认判断调用一次verify(mockedList).add("once");verify(mockedList, times(1)).add("once");//exact number of invocations verificationverify(mockedList, times(2)).add("twice");verify(mockedList, times(3)).add("three times");//verification using never(). never() is an alias to times(0)verify(mockedList, never()).add("never happened");//verification using atLeast()/atMost()verify(mockedList, atMostOnce()).add("once");verify(mockedList, atLeastOnce()).add("three times");verify(mockedList, atLeast(2)).add("three times");verify(mockedList, atMost(5)).add("three times");

5.抛出异常

doThrow(new RuntimeException()).when(mockedList).clear();//following throws RuntimeException:mockedList.clear();

6.校验调用顺序

// A. Single mock whose methods must be invoked in a particular orderList singleMock = mock(List.class);//using a single mocksingleMock.add("was added first");singleMock.add("was added second");//create an inOrder verifier for a single mockInOrder inOrder = inOrder(singleMock);//following will make sure that add is first called with "was added first", then with "was added second"inOrder.verify(singleMock).add("was added first");inOrder.verify(singleMock).add("was added second");// B. Multiple mocks that must be used in a particular orderList firstMock = mock(List.class);List secondMock = mock(List.class);//using mocksfirstMock.add("was called first");secondMock.add("was called second");//create inOrder object passing any mocks that need to be verified in orderInOrder inOrder = inOrder(firstMock, secondMock);//following will make sure that firstMock was called before secondMockinOrder.verify(firstMock).add("was called first");inOrder.verify(secondMock).add("was called second");// Oh, and A + B can be mixed together at will

7. 校验调用关系

 //using mocks - only mockOne is interactedmockOne.add("one");//ordinary verificationverify(mockOne).add("one");//verify that method was never called on a mockverify(mockOne, never()).add("two");//verify that other mocks were not interactedverifyZeroInteractions(mockTwo, mockThree);

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java单元测试之Mock测试编写

1. Mock一个对象

2.添加预期返回结果

3.校验方法入参

4.校验调用次数,至少xx次,没有调用

5.抛出异常

6.校验调用顺序

7. 校验调用关系

8.

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