diff --git a/tests/__init__.py b/tests/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tox.ini b/tox.ini
index a827d9b..9b06526 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,12 +32,13 @@ commands =
     cleanpy --all --exclude-envs .
 
 [testenv:cov]
+passenv = *
 deps =
     .[test]
-    coverage[toml]
-    pytest-cov
+    coverage[toml]>=5
 commands =
-    pytest --cov {posargs:-vv}
+    coverage run -m pytest {posargs:-vv}
+    coverage report -m
 
 [testenv:fmt]
 basepython = python3.7