parametrize test

Author: realead

pandas/tests/indexing/test_indexing.py

@@ -786,12 +786,12 @@ def test_no_reference_cycle(self):
         del df
         assert wr() is None
 
-    def test_label_indexing_on_nan(self):
+    def test_label_indexing_on_nan(self, nulls_fixture):
         # GH 32431
-        df = Series([1, "{1,2}", 1, None])
+        df = Series([1, "{1,2}", 1, nulls_fixture])
         vc = df.value_counts(dropna=False)
-        result1 = vc.loc[None]
-        result2 = vc[None]
+        result1 = vc.loc[nulls_fixture]
+        result2 = vc[nulls_fixture]
 
         expected = 1
         assert result1 == expected