We were importing the extension test runner before setting the

RB_RUNNING_TESTS environment variable which meant that the instance of

Review Board used for testing would have the wrong configuration

to start. Specifically, the RUNNING_TESTS setting was set to the

wrong value, causing parts of the codebase to be unaware that they

were running in a test environment, which caused them to set up

some defaults in the database that conflicted with the test fixtures.

Wrote a simple test for an extension and ran it successfully.