diff --git a/tests/test_core.py b/tests/test_core.py
index 51451fd..a562635 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -39,6 +39,7 @@ def config(request, monkeypatch):
     monkeypatch.setattr("planetmint.config", config)
     return config
 
+
 def test_bigchain_class_default_initialization(config):
     from planetmint import Planetmint
     from planetmint.validation import BaseValidationRules