Mark test_accessor_sliced_datacube as xfail due to upstream bug (#1895)

Author: seisman

pygmt/tests/test_accessor.py

@@ -5,9 +5,13 @@
 
 import pytest
 import xarray as xr
-from pygmt import which
+from packaging.version import Version
+from pygmt import clib, which
 from pygmt.exceptions import GMTInvalidInput
 
+with clib.Session() as _lib:
+    gmt_version = Version(_lib.info["version"])
+
 
 def test_accessor_gridline_cartesian():
     """
@@ -70,6 +74,10 @@ def test_accessor_set_non_boolean():
         grid.gmt.gtype = 2
 
 
+@pytest.mark.skipif(
+    gmt_version < Version("6.4.0"),
+    reason="Upstream bug fixed in https://github.com/GenericMappingTools/gmt/pull/6615",
+)
 def test_accessor_sliced_datacube():
     """
     Check that a 2D grid which is sliced from an n-dimensional datacube works
@@ -87,6 +95,6 @@ def test_accessor_sliced_datacube():
             grid = dataset.sel(level=500, month=1, drop=True).z
 
         assert grid.gmt.registration == 0  # gridline registration
-        assert grid.gmt.gtype == 0  # cartesian coordinate type
+        assert grid.gmt.gtype == 1  # geographic coordinate type
     finally:
         os.remove(fname)