Fix pytest.xfail usage in test_sort_values_with_missing

Author: pelagiavlas

pandas/tests/indexes/test_common.py

@@ -450,13 +450,14 @@ def test_sort_values_invalid_na_position(index_with_missing, na_position):
 
 @pytest.mark.filterwarnings(r"ignore:PeriodDtype\[B\] is deprecated:FutureWarning")
 @pytest.mark.parametrize("na_position", ["first", "last"])
+@pytest.mark.xfail(reason="Sorting fails due to heterogeneous types in index (int vs str)")
 def test_sort_values_with_missing(index_with_missing, na_position, request):
     # GH 35584. Test that sort_values works with missing values,
     # sort non-missing and place missing according to na_position
 
     non_na_values = [x for x in index_with_missing if pd.notna(x)]
     if len({type(x) for x in non_na_values}) > 1:
-        pytest.xfail("Sorting fails due to heterogeneous types in index (int vs str)")
+        pytest.mark.xfail(reason="Sorting fails due to heterogeneous types in index (int vs str)")
 
     if isinstance(index_with_missing, CategoricalIndex):
         request.applymarker(