thoughtbot/shoulda-matchers — pull request #346 by mxie (2013-08-23 20:50:07+00:00)
Title: Remove old version of uniqueness validation matcher specs

When the `allow_nil` option was introduced, the tests written for it was based on an older version of the `validate_uniqueness_of` matcher. The tests are now in the newer version, located in `spec/shoulda/matchers/active_model`.