Run tests with warnings as errors.

domdfcoding · domdfcoding · commit 41934de8228b · 2022-01-18T10:03:39.000Z
diff --git a/tox.ini b/tox.ini
@@ -149,6 +149,9 @@ package = flake8_strftime
 [pytest]
 addopts = --color yes --durations 25
 timeout = 300
+filterwarnings =
+    error
+    ignore:can't resolve package from __spec__ or __package__, falling back on __name__ and __path__:ImportWarning
 
 [testenv:lint]
 basepython = python3.6
