ipython/ipython — pull request #4909 by juliantaylor (2014-01-28 22:12:18+00:00)
Title: sort dictionary keys before comparison, ordering is not guaranteed

failed for me on 1.x with

nose.proxy.AssertionError: AssertionError: Lists differ: ['a', 'b'] != ['b', 'a']

(2to3 wraps a list around it)