Error on specific warnings

This also skips the RedirectsPanel's deprecation warning from raising errors.

Author: tim-schilling

tox.ini

@@ -43,7 +43,11 @@ passenv=
     GITHUB_*
 setenv =
     PYTHONPATH = {toxinidir}
-    PYTHONWARNINGS = default,ignore:The RedirectsPanel is deprecated:DeprecationWarning
+    PYTHONWARNINGS =\
+        error::ResourceWarning,\
+        error::DeprecationWarning,\
+        error::PendingDeprecationWarning,\
+        ignore:The RedirectsPanel is deprecated:DeprecationWarning
     DB_NAME = {env:DB_NAME:debug_toolbar}
     DB_USER = {env:DB_USER:debug_toolbar}
     DB_HOST = {env:DB_HOST:localhost}