如何通过 JUnit 测试拦截 SLF4J(带 logback)日志记录? [英] How to intercept SLF4J (with logback) logging via a JUnit test?

问题描述

是否有可能通过 JUnit 测试用例以某种方式拦截日志记录(SLF4J + logback)并获得 InputStream(或其他可读的东西)...?

Is it possible to somehow intercept the logging (SLF4J + logback) and get an InputStream (or something else that is readable) via a JUnit test case...?

推荐答案

您可以创建自定义 appender

You can create a custom appender

public class TestAppender extends AppenderBase<LoggingEvent> {
    static List<LoggingEvent> events = new ArrayList<>();
    
    @Override
    protected void append(LoggingEvent e) {
        events.add(e);
    }
}

并配置 logback-test.xml 以使用它.现在我们可以从我们的测试中检查日志事件:

and configure logback-test.xml to use it. Now we can check logging events from our test:

@Test
public void test() {
    ...
    Assert.assertEquals(1, TestAppender.events.size());
    ...
}

注意:如果没有得到任何输出，请使用 ILoggingEvent - 请参阅注释部分以了解推理.

NOTE: Use ILoggingEvent if you do not get any output - see the comment section for the reasoning.

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