Code review comment for lp:~bac/launchpad/repeats

I have some questions about this branch.

Why are test cases that have no layer filtered out? I would think that
we have at least a few tests that aren't in a layer (pure unit tests).

The imports for TestCase and filter_tests only need one line so they
shouldn't use multi-line imports.

FakeTestCase looks like it needs to stretch (it doesn't have any
whitespace between methods).

The TestFilterTests setUp method probably did something in an earlier
edit other than calling the super class' method of the same name, but
now that it doesn't, there's no need for it to be defined at all.

Instead of "self.assertTrue(layername in results)" you should use
assertIn, which generates slightly nicer error messages when the
assertion fails.