Mark test as xfail

and turn xpass into failure.

jdaviz/configs/imviz/tests/test_delete_data.py

@@ -1,4 +1,5 @@
 import numpy as np
+import pytest
 from astropy.coordinates import Angle
 from astropy.nddata import NDData
 from astropy.tests.helper import assert_quantity_allclose
@@ -75,6 +76,7 @@ def test_delete_with_subset_wcs(self):
         assert_allclose(subset2.subset_state.roi.ymax, 2)
 
 
+@pytest.mark.xfail(reason="FIXME: JDAT-3958")
 class TestDeleteWCSLayerWithSubset(BaseImviz_WCS_GWCS):
     """Regression test for https://jira.stsci.edu/browse/JDAT-3958"""
     def test_delete_wcs_layer_with_subset(self):

pyproject.toml

@@ -124,6 +124,7 @@ astropy_header = true
 doctest_plus = "enabled"
 text_file_format = "rst"
 addopts = "--doctest-rst --import-mode=append"
+xfail_strict = true
 filterwarnings = [
     "error",
     "ignore:numpy\\.ufunc size changed:RuntimeWarning",