412554b2f06f3782c9336f5a4dfc5bb890219afd,pandas/tests/indexing/test_coercion.py,TestInsertIndexCoercion,test_insert_index_datetimes,#TestInsertIndexCoercion#Any#Any#Any#Any#,443

Before Change

        [pd.Timestamp("2012-01-01"), pd.Timestamp("2012-01-01", tz="Asia/Tokyo"), 1],
    )
    def test_insert_index_datetimes(self, request, fill_val, exp_dtype, insert_value):
        if not hasattr(insert_value, "tz"):
            request.node.add_marker(
                pytest.mark.xfail(reason="ToDo: must coerce to object")
            )
        elif fill_val.tz != insert_value.tz:
            request.node.add_marker(
                pytest.mark.xfail(reason="GH 37605 - require tz equality?")
            )

        obj = pd.DatetimeIndex(
            ["2011-01-01", "2011-01-02", "2011-01-03", "2011-01-04"], tz=fill_val.tz
        )
        assert obj.dtype == exp_dtype

After Change

            ts = pd.Timestamp("2012-01-01")
            result = obj.insert(1, ts)
            expected = obj.astype(object).insert(1, ts)
            assert expected.dtype == object
            tm.assert_index_equal(result, expected)

            // mismatched tz --> cast to object (could reasonably cast to commom tz)
            ts = pd.Timestamp("2012-01-01", tz="Asia/Tokyo")

Instances