Set testpaths for pytest

Author: dmtucker

tox.ini

@@ -137,7 +137,10 @@ deps =
 
     pexpect ~= 4.8.0
 
-commands = py.test -p no:mypy --cov pytest_mypy --cov-fail-under 100 --cov-report term-missing {posargs:-n auto} tests
+commands = py.test -p no:mypy --cov pytest_mypy --cov-fail-under 100 --cov-report term-missing {posargs:-n auto}
+
+[pytest]
+testpaths = tests
 
 [testenv:publish]
 passenv = TWINE_*