diff --git a/compliance_checker/tests/helpers.py b/compliance_checker/tests/helpers.py
index 78b4649c..3642e123 100644
--- a/compliance_checker/tests/helpers.py
+++ b/compliance_checker/tests/helpers.py
@@ -31,6 +31,7 @@ def __dealloc__(self):
         except AttributeError:
             pass
 
+
 class MockTimeSeries(MockNetCDF):
     """
     Mock time series with time dimension and time, lon, lat, and depth