diff --git a/pvlib/tests/test_singlediode.py b/pvlib/tests/test_singlediode.py
index bd3b33776a..8e0d05668e 100644
--- a/pvlib/tests/test_singlediode.py
+++ b/pvlib/tests/test_singlediode.py
@@ -1,6 +1,7 @@
 """
 testing single-diode methods using JW Bishop 1988
 """
+
 import numpy as np
 import pandas as pd
 import scipy