PowerMock:嘲笑静态最终记录器

Question

我正在尝试编写测试，以检查是否已记录了某些行。我谷歌搜索了一段时间，但我无法弄清楚为什么不替换LOG。

测试课程：

public class Example {
    private static final Logger LOG = LoggerFactory.getLogger(Example.class);
    public void foo(...)
    {
       if(...)
         LOG.warn("Warning");
       //...
    }
}

测试：

@RunWith(PowerMockRunner.class)
@PrepareForTest({LoggerFactory.class})
public class MyTest
{
    @Mock
    Logger logger;
    @InjectMocks
    private final Example example = new Example();
    @Test
    public void test1() {
        PowerMockito.mockStatic(LoggerFactory.class);
        logger = PowerMockito.mock(Logger.class);
        PowerMockito.when(LoggerFactory.getLogger(Example.class)).thenReturn(logger);
        example.foo(...);
        Mockito.verify(logger).warn("Warning");
    }
}

使用SLF4J，PowerMock 1.7.1。

ps：在此项目中替换private static final Logger LOG是没有选项。

Answer 1

您为时过早创建了主题。您在创建主题后安排模拟井。

安排静态模拟后创建主题

@RunWith(PowerMockRunner.class)
@PrepareForTest({LoggerFactory.class})
public class MyTest {
    @Test
    public void test1() {
        //Arrange
        Logger logger = PowerMockito.mock(Logger.class);
        PowerMockito.mockStatic(LoggerFactory.class);           
        PowerMockito.when(LoggerFactory.getLogger(Example.class)).thenReturn(logger);
        Example example = new Example();
        //Act
        example.foo(..);
        //Assert
        Mockito.verify(logger).warn("Warning");
    }
}