如何使用junit断言org.slf4j.Logger语句？

Question

如何使用org.slf4j.Logger中的junit验证spring-boot-test中的日志语句

@Service
public class MyService {
    private final org.slf4j.Logger LOGGER = org.slf4j.LoggerFactory.getLogger(this.getClass());
    
    public void run() {
        LOGGER.info("running");
    }
}

@SpringBootTest
public class MyTest {
    @Autowired
    private MyService service;

    @Test
    public void test() {
        service.run();
        
        //TODO how to validate log statement?
    }
}

Answer 1

我用Springs @ExtendWith(OutputCaptureExtension.class)找到了一个解决方案

@SpringBootTest
@TestPropertySource(properties = "logging.level.root=INFO")
public class LogServiceTest {
    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Test
    @ExtendWith(OutputCaptureExtension.class)
    public void testLogging(CapturedOutput capture) {
        logger.info("junit"); //can be replaced with any service call that logs
        assertThat(capture.getOut()).contains("junit");
    }
}

它需要在您的follow="true"配置中使用log4j选项：

<Console name="CONSOLE" target="SYSTEM_OUT" follow="true">

Answer 2

如果底层的SLF4J是Log4j 2.x，就像标记可能包含的那样，您可以使用ListAppender，它包含在log4j-core的test-jar中。