Question

我正在尝试测试以下无效方法：

@Override
    public void onApplicationEvent(ApplicationEvent myEvent) {
        if (myEvent instanceof ApplicationEnvironmentPreparedEvent) {
            ConfigurableEnvironment myEnv= ((ApplicationEnvironmentPreparedEvent) myEvent).getEnvironment();
            setSystemVariables(myEnv);
        }

    }

我正在使用Matchers，这是单元测试（显然没有测试任何东西）

@Test
    public void testOnApplicationEvent() {
        loggingListener.onApplicationEvent(any(ApplicationEnvironmentPreparedEvent.class));
    }

两个问题： 1.我从构建中得到的错误是“无效使用Matchers”，并且我的Jenkins构建中未通过测试（但在Idea IDE中通过了） 2.如何测试这些方法以将测试覆盖率保持在期望的水平

Answer 1

1-此问题是因为any的使用不正确。有关详细信息，请参见Mockito指南。在我的示例下面，不使用any，问题将消失。

2-为了涵盖if的2个分支，我建议使用以下测试用例。

@Test
public void onApplicationEventShouldSetEnvironmentWhenApplicationEnvironmentPreparedEvent() {
    ConfigurableEnvironment actualEnvironment = null;

    // Given a listener with overridden setSystemVariables() to store passed env.
    LoggingListener loggingListener = new LoggingListener() {
        @Override
        void setSystemVariables(ConfigurableEnvironment var){
            actualEnvironment = var;
        }
    };

    // Given some dummy environment which is delivered by an event.
    ConfigurableEnvironment expectedEnvironment = new ConfigurableEnvironment();

    // Given a mocked event with above dummy environment.
    ApplicationEvent mockedEvent = Mockito(ApplicationEnvironmentPreparedEvent.class);
    Mockito.when(mockedEvent.getEnvironment()).returns(expectedEnvironment);

    // When call a method under test
    loggingListener.onApplicationEvent(mockedEvent);

    // Then make sure the given environment was passed and set correctly
    assertSame(expectedEnvironment, actualEnvironment);
}

@Test
public void onApplicationEventShouldSkipNotApplicationEnvironmentPreparedEvent() {
    // Given a listener with overridden setSystemVariables() to fail the test if called.
    LoggingListener loggingListener = new LoggingListener() {
        @Override
        void setSystemVariables(ConfigurableEnvironment var){
            fail("This method should not be called");
        }
    };

    // Given a mocked other (not ApplicationEnvironmentPreparedEvent) event.
    ApplicationEvent mockedEvent = Mockito(UnknownEvent.class);

    // When call a method under test
    loggingListener.onApplicationEvent(mockedEvent);

    // Then make sure an environment was not asked at all.
    Mockito.verify(mockedEvent.getEnvironment(), never);
}

请注意，这不是可编译的代码，因为我不知道您的完整生产代码，因此请将其作为一种想法，通过相应的修改将其应用于您的真实代码。

Java-使用Matchers对void方法进行单元测试

1 个答案: