Run tests with warnings as errors.

domdfcoding · domdfcoding · commit f80010df6bd7 · 2022-01-17T21:11:28.000Z
diff --git a/tox.ini b/tox.ini
@@ -186,3 +186,7 @@ package = snippet_fmt
 [pytest]
 addopts = --color yes --durations 25
 timeout = 300
+filterwarnings =
+    error
+    ignore:lib2to3 package is deprecated and may not be able to parse Python 3.10+:DeprecationWarning
+    ignore:lib2to3 package is deprecated and may not be able to parse Python 3.10+:PendingDeprecationWarning
