Add a way to see a captured log event

[klitoskyriacou]

Let's say I have something like this in my production code:

var username = "fred";
MDC.put("user", username);
logger.warn("The user " + username + " has requested xyz");

I would like to be able to check that the message contains a string that matches a certain MDC key:

logCaptureListener.logged(aLog().withMdc("user", ???).withMessage(Mathers.containsString(<whatever was in Mdc>));

Perhaps this feature can be delivered in a similar way to Mockito's or Mockk's "capture" facitilities.

[jsalinaspolo]

Let me think about it. I guess we could add Context and keep some data there 🤔