thoughtbot/shoulda-matchers — pull request #387 by meesterdude (2013-11-26 09:52:10+00:00)
Title:   adds example to readme to elaborate on #with_message 

small change; but was getting stuck and had to go poking about the implementation to figure out why my specs were failing and how to fix. Not sure if it warrants more elaboration, or if the example will suffice.