Add tests for the warnings module; specifically formatwarning and showwarning. Still need tests for warn_explicit and simplefilter.
Add tests for the warnings module; specifically formatwarning and showwarning.
Still need tests for warn_explicit and simplefilter.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator