I'm using LightPlatformCodeInsightFixtureTestCase to test the completion for my plugin. I have all the tests passing except for those that test completion of `alias as:`. For some reason, in these tests, the CodeInsightTestFixture#getLookup returns null. I've placed break points in the getVariants call and it is being called in theses tests, but unlike the other tests the fixture says there's no lookup. Is there some reason the tests lookup would behave differently than the Debug Plugin runner lookup?