thoughtbot/shoulda-matchers — pull request #159 by grantovich (2012-09-21 21:53:06+00:00)
Title: Test more blank values with allow_blank

This fixes the specific issue described in #120. It doesn't rigorously account for all cases where an attribute allows a subset of "blank" values, but I'm not sure how that could be accomplished or whether it's even necessary to do so.