diff --git a/datafusion/tests/test_functions.py b/datafusion/tests/test_functions.py
index 0cefed608..80795bf12 100644
--- a/datafusion/tests/test_functions.py
+++ b/datafusion/tests/test_functions.py
@@ -188,7 +188,9 @@ def test_math_functions():
     np.testing.assert_array_almost_equal(result.column(32), np.sinh(values))
     np.testing.assert_array_almost_equal(result.column(33), np.tanh(values))
     np.testing.assert_array_almost_equal(result.column(34), math.factorial(6))
-    np.testing.assert_array_almost_equal(result.column(35), np.isnan(na_values))
+    np.testing.assert_array_almost_equal(
+        result.column(35), np.isnan(na_values)
+    )
     np.testing.assert_array_almost_equal(result.column(36), na_values == 0)
     np.testing.assert_array_almost_equal(
         result.column(37), np.emath.logn(3, values + 1.0)