Mockito 2的懒惰校验

该系列文章翻译自https://www.baeldung.com/mockito-series

Mockito默认的机制是遇到第一个校验错误就停止，也就是通常所说的fail-fast。但是，有时候我们需要执行所有的校验，并看到所有的校验结果，不管中途是否发生校验错误。VerificationCollector就是可以解决上述问题的一种Junit 规则，它可以收集测试方法中所有的校验结果。

1. Maven依赖

    org.mockito
    mockito-core
    2.21.0

2. fail-fast的方式

    @Test
    public void testLazyVerification1() throws Exception {
        List mockList = mock(ArrayList.class);

        verify(mockList).add("one");
        verify(mockList).clear();
    }

    @Test
    public void testLazyVerification2() throws Exception {
        List mockList = mock(ArrayList.class);

        verify(mockList).add("one");
        verify(mockList).clear();
    }

fail-fast的方式中，testLazyVerification1()和testLazyVerification2()都只能看到第一个校验的报告

Wanted but not invoked:
arrayList.add("one");
-> at com.baeldung.mockito.java8.LazyVerificationTest.testLazyVerification(LazyVerificationTest.java:19)
Actually, there were zero interactions with this mock.

3. lazy vertification的方式

    @Rule
    public VerificationCollector verificationCollector = MockitoJUnit.collector();

    @Test
    public void testLazyVerification1() throws Exception {
        List mockList = mock(ArrayList.class);

        verify(mockList).add("one");
        verify(mockList).clear();
    }

    @Test
    public void testLazyVerification2() throws Exception {
        List mockList = mock(ArrayList.class);

        verify(mockList).add("one");
        verify(mockList).clear();
    }

lazy vertification的方式中，可以看到所有校验的校验结果

org.mockito.exceptions.base.MockitoAssertionError: There were multiple verification failures:
1. Wanted but not invoked:
arrayList.add("one");
-> at com.baeldung.mockito.java8.LazyVerificationTest.testLazyVerification(LazyVerificationTest.java:21)
Actually, there were zero interactions with this mock.
 
2. Wanted but not invoked:
arrayList.clear();
-> at com.baeldung.mockito.java8.LazyVerificationTest.testLazyVerification(LazyVerificationTest.java:22)
Actually, there were zero interactions with this mock.