Merge pull request #1171 from PyCQA/pytest

run testsuite with pytest

Author: asottile

tox.ini

@@ -11,11 +11,12 @@ skip_missing_interpreters = True
 deps =
     covdefaults
     coverage
+    pytest
 commands =
     python -m pycodestyle --statistics pycodestyle.py
     coverage run -m pycodestyle --max-doc-length=72 --testsuite testing/data
     coverage run -m pycodestyle --max-doc-length=72 --doctest
-    coverage run -m unittest discover testsuite -vv
+    coverage run -m pytest testsuite
     coverage combine
     coverage report