tests: Run with PYTHONWARNINGS=all

Author: jleclanche

tox.ini

@@ -9,8 +9,9 @@ envlist =
 [testenv]
 commands = pytest --cov=oauth2_provider --cov-report= --cov-append
 setenv =
-	DJANGO_SETTINGS_MODULE=tests.settings
-	PYTHONPATH={toxinidir}
+	DJANGO_SETTINGS_MODULE = tests.settings
+	PYTHONPATH = {toxinidir}
+	PYTHONWARNINGS = all
 deps =
 	django110: Django >=1.10, <1.11
 	django111: Django >=1.11, <2.0