diff --git a/tests.py b/tests.py
index 678b4219231c1c5411ca3898fadae6e3434152c8..42d1e74483f8b2f6ec1f751a011d18dfd3bf430d 100644
--- a/tests.py
+++ b/tests.py
@@ -38,7 +38,9 @@ def create_mock_git_repository(target_directory, create_directory=True):
         # that.
         user_details = "-c user.name='Tes Ta' -c user.email='tester@some-ci.org'"
         subprocess.run(
-            f'git {user_details} commit -m "first commit" readme.txt', shell=True, check=True
+            f'git {user_details} commit -m "first commit" readme.txt',
+            shell=True,
+            check=True,
         )