tests: remove WarnTest
We would raise this if a test didn't return a result code. AFAICT
this can only occur if there is a logic error in the test harness
itself.
I don't think it is worth the code complexity to distinguish this
failure scenario from a regular test failure.
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)