diff --git a/tests/optimize/__init__.py b/tests/optimize/__init__.py
index 80fce9ca5..f29d8d585 100644
--- a/tests/optimize/__init__.py
+++ b/tests/optimize/__init__.py
@@ -44,7 +44,6 @@ def _get_frame_time_from_offset(offset):
 
 
 def _build_backtest_dataframe(data):
-    
     columns = ['date', 'open', 'high', 'low', 'close', 'volume', 'buy', 'sell']
     columns = columns + ['buy_tag'] if len(data[0]) == 9 else columns