1.0.2dev: Extend `EnvironmentTestCase` to check object identity. Refs #11245.
1.0.2dev: Extend `EnvironmentTestCase` to check object identity. Refs #11245.

Object identity is tested for lazily-evaluated attributes, to ensure they are returning the same object on each call. The `assertIs` method is added to the test `unittest.TestCase` subclass when not present (Python < 2.7).


git-svn-id: 3bd1c7f5b9365705bff4dd56977498491f5ac132@11939 af82e41b-90c4-0310-8c96-b1721e28e2e2

exocad/exotrac,exocad/exotrac,exocad/exotrac,exocad/exotrac