diff --git a/kallithea/tests/__init__.py b/kallithea/tests/__init__.py
--- a/kallithea/tests/__init__.py
+++ b/kallithea/tests/__init__.py
@@ -20,6 +20,7 @@ Refer to docs/contributing.rst for detai
 
 import pytest
 
+
 if getattr(pytest, 'register_assert_rewrite', None):
     # make sure that all asserts under kallithea/tests benefit from advanced
     # assert reporting with pytest-3.0.0+, including api/api_base.py,