Some of tests use different method of assertTrue(isinstance(A, B)) or
assertEqual(type(A), B). The correct way is to use assertIsInstance(A,
B) provided by testtools.
Change-Id: I8e95e10fac4748b115838b6b480f1085da73f28a
Closes-bug: #1268480
Moved tests/extensions to tests/unit/extensions, otherwise they
wouldn't have run. Renamed the files in tests/unit/extensions to be
prefixed with 'test_', to match the rest of the test files. Did a
general clean up of tox.ini so we have standard whitespace.
Change-Id: I5615bfbf2d6ff4a4bc3e66e71c2472b0d1e3a2d7
