Run tests in parallel

Author: dmtucker

tox.ini

@@ -96,7 +96,7 @@ deps =
 
     pytest-cov ~= 2.5.1
     pytest-randomly ~= 2.1.1
-commands = py.test -p no:mypy --cov pytest_mypy --cov-fail-under 100 --cov-report term-missing {posargs}
+commands = py.test -p no:mypy -n auto --cov pytest_mypy --cov-fail-under 100 --cov-report term-missing {posargs}
 
 [testenv:flake8]
 skip_install = true