Standardize behavior: no docstrings in test functions.  Also get rid of dummy_test_TemporaryFile class; when NamedTemporaryFile and TemporaryFile are the same, simply don't add a test suite for TemporaryFile.
Standardize behavior: no docstrings in test functions.  Also get rid
of dummy_test_TemporaryFile class; when NamedTemporaryFile and
TemporaryFile are the same, simply don't add a test suite for
TemporaryFile.

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