Add xfail mark to tests failing on pandas bug

Adds xfail mark to 2 tests failing as a result of a bug in pandas
(see comments in tests code for details). Bug manifests in tests,
not in package. Bug should be fixed from pandas version after
2.2.2. Should then be able to remove the xfail.

tests/test_helpers.py

@@ -312,6 +312,11 @@ def test_volume_to_na(intraday_pt, intraday_pt_ss):
     assert_frame_equal(rtrn, df)
 
 
+# TODO Remove xfail when pandas >2.2 released
+# NB pd bug manifests in test, not package (manifests where evaluate
+# `expected_ooo.index = df[::12]`)
+# pandas issue ref is https://github.com/pandas-dev/pandas/issues/58604
+@pytest.mark.xfail(reason="Known pd issue with py3.12, should resolve with pd>2.2")
 def test_resample(intraday_pt):
     """Test `resample`.
 

tests/test_pt.py

@@ -2142,6 +2142,11 @@ def test_cbday_freq(self, daily_pt_ss, xnys):
             df.pt.downsample("3d", xnys),
         )
 
+    # TODO Remove xfail when pandas >2.2 released
+    # NB pd bug manifests in test, not package (manifests where takes a slice to
+    # evaluate 'subset').
+    # pandas issue ref is https://github.com/pandas-dev/pandas/issues/58604
+    @pytest.mark.xfail(reason="Known pd issue with py3.12, should resolve with pd>2.2")
     def test_monthly_freq(self, daily_pt, xnys, x247, one_day, symbols):
         """Verify "MS" and "QS" frequencies."""
         df = daily_pt