diff --git a/test/test_koopman.py b/test/test_koopman.py
index 7534959..adf5176 100644
--- a/test/test_koopman.py
+++ b/test/test_koopman.py
@@ -31,7 +31,6 @@
 from sklearn.utils.validation import check_is_fitted
 
 
-
 def test_default_fit(data_random):
     """test if default pykoopman.Koopman will work"""
     x = data_random