refactor: apply suggestions from code review

Co-authored-by: Sugat Bajracharya <[email protected]>

Author: aj3sh

Diff for: pytest.ini

@@ -1,2 +1,4 @@
 [pytest]
 pythonpath = src
+python_files = test_*.py
+addopts = -vvv

Diff for: tests/test_cli.py

@@ -116,7 +116,7 @@ def test__main__valid_commit_message_using_quick(
         *_,
     ):
         main()
-        mock_stdout_write.assert_called_with(f"{VALIDATION_SUCCESSFUL}\n")
+        mock_stdout_write.assert_called_once_with(f"{VALIDATION_SUCCESSFUL}\n")
 
     @patch(
         "commitlint.cli.get_args",