java - Powermock : Mocking static final logger

Question

我正在尝试编写测试来检查是否记录了某些行。我在谷歌上搜索了一段时间，但我不明白为什么 LOG 没有被替换。

要测试的类:

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");
    }
}

使用了 SLF4J 和 PowerMock 1.7.1。

PS:替换 private static final Logger LOG 在这个项目中不是选项。

Answer 1

您过早地创建了主题。在创建主题后，您可以很好地安排模拟。

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");
    }
}