fix formatting

Author: thaiv28

pandas/tests/frame/methods/test_fillna.py

@@ -256,20 +256,18 @@ def test_fillna_categorical_nan(self):
         idx = TimedeltaIndex(["1 days", "2 days", "1 days", NaT, NaT])
         df = DataFrame({"a": Categorical(idx)})
         tm.assert_frame_equal(df.fillna(value=NaT), df)
-        
+
     def test_fillna_with_categorical_series(self):
-        df = DataFrame({
-            'cats': Categorical(['A', 'B', 'C']),
-            'ints': [1.0, 2.0, np.nan]
-        })
-       
+        df = DataFrame(
+            {"cats": Categorical(["A", "B", "C"]), "ints": [1.0, 2.0, np.nan]}
+        )
+
         filler = Series(Categorical([10.0, 20.0, 30.0]))
-        df.fillna({'ints': filler}, inplace=True)
-        
-        expected = DataFrame({
-            'cats': Categorical(['A', 'B', 'C']),
-            'ints': [1.0, 2.0, 30.0]
-        })
+        df.fillna({"ints": filler}, inplace=True)
+
+        expected = DataFrame(
+            {"cats": Categorical(["A", "B", "C"]), "ints": [1.0, 2.0, 30.0]}
+        )
         tm.assert_frame_equal(df, expected)
 
     def test_fillna_no_downcast(self, frame_or_series):