LoggerMocker would be nice to have

[yegor256]

Would be nice to have LoggerMocker class, which can catch all logging messages and enable assertions on them.

Something like this:

@Test
public void testSomeCode() {
  final LoggerMocker log = new LoggerMocker().mock();
  // some code
  log.expect(MyClass.class)
    .info("works fine at this moment")
    .expect(SomeOtherClass.class)
    .error("some defect")
    .show();
}

[yegor256]

it's better to create jcabi-matchers-slf4j module, which will do something like this:

@Test
public void testSomeCode() {
  final Slf4jCapture capture = new Slf4jCapture();
  // some code
  MatcherAssert.assertThat(
    capture, // collection of slf4j events
    Matchers.hasItem(
      Matchers.allOf(
        Log4jMatchers.hasLevel(Level.INFO),
        Log4jMatchers.hasMessage(Matchers.containsString("test"))
      )
    )
  );
}