diff --git a/setup.cfg b/setup.cfg
index 9b1590f87..d9a2ec5d8 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,3 +21,5 @@ addopts =
   --strict-config
   --strict-markers
 xfail_strict=True
+python_classes = test_*
+