diff --git a/pyproject.toml b/pyproject.toml
index 521460b1..6f213a31 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ addopts = [
     "--import-mode=importlib",
 ]
 pythonpath = [
-  "src"
+    "src", "tests"
 ]
 [build-system]
 requires = ["poetry-core"]