thoughtbot/shoulda-matchers — pull request #403 by mfrost (2013-12-12 21:50:49+00:00)
Title: Use ActiveSupport delegation over Ruby Forwardable

The delegation style found in the AssociationMatcher is an ActiveSupport style; requiring `forwardable` without extending it does not add delegation support.

Came across this in a unit test that did not have the ActiveSupport extensions loaded.