ContentTypes cache not cleared between tests

[tomviner]

We've been testing our query counts, and found our tests weren't independent due to the caching of ContentTypes causing query counts to depend on test ordering.

There's a handy pytest-django fixture for clearing the Sites cache but not one for ContentTypes.

Is this something that would be accepted as an addition to this library? It would call ContentType.objects.clear_cache()

[bluetech]

The downside is that it will slow down tests when this cache is beneficial.

Is it a complete hassle to clear the cache manually before sensitive num-queries assertions? If yes, if we add a fixture but not autouse would that still be too much hassle?