e82a05864f
assertItemsEqual was removed from Python's unittest.TestCase in Python 3.3 [1][2]. We have been able to use them since then, because testtools required unittest2, which still included it. With testtools removing Python 2.7 support [3][4], we will lose support for assertItemsEqual, so we should switch to use assertCountEqual. [1] - https://bugs.python.org/issue17866 [2] - https://hg.python.org/cpython/rev/d9921cb6e3cd [3] - testing-cabal/testtools#286 [4] - testing-cabal/testtools#277 Change-Id: I0bbffbec8889b8b3067cfe17d258f5cb16624f38