remove xfails

Author: jorisvandenbossche

pandas/tests/frame/indexing/test_indexing.py

@@ -9,8 +9,6 @@
 import numpy as np
 import pytest
 
-from pandas._config import using_string_dtype
-
 from pandas._libs import iNaT
 from pandas.errors import InvalidIndexError
 
@@ -503,7 +501,6 @@ def test_setitem_ambig(self, using_infer_string):
         else:
             assert dm[2].dtype == np.object_
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_setitem_None(self, float_frame):
         # GH #766
         float_frame[None] = float_frame["A"]

pandas/tests/reshape/test_pivot.py

@@ -2698,9 +2698,6 @@ def test_pivot_index_is_none(self):
         expected = DataFrame(3, index=[1], columns=Index([2], name="b"))
         tm.assert_frame_equal(result, expected)
 
-    @pytest.mark.xfail(
-        using_string_dtype(), reason="TODO(infer_string) None is cast to NaN"
-    )
     def test_pivot_values_is_none(self):
         # GH#48293
         df = DataFrame({None: [1], "b": 2, "c": 3})