diff --git a/pvlib/tests/test_shading.py b/pvlib/tests/test_shading.py
index 17eafa5eed..27511c2aab 100644
--- a/pvlib/tests/test_shading.py
+++ b/pvlib/tests/test_shading.py
@@ -264,7 +264,7 @@ def test_projected_solar_zenith_angle_datatypes(
 @pytest.fixture
 def sf_premises_and_expected():
     """Data comprised of solar position, tracker orientations, ground coverage
-    ratios and terrain slopes with respective shade fractions (sf)"""   
+    ratios and terrain slopes with respective shade fractions (sf)"""
     # preserve tracker_shade_fraction's args order and append shadow depth, z
     premises_and_results = pd.DataFrame(
         columns=["solar_zenith", "solar_azimuth", "tracker_tilt",