Mark test_binstats_quantile as xfail in the GMT Legacy Tests workflow

.github/workflows/ci_tests_legacy.yaml

@@ -12,7 +12,7 @@ on:
   # push:
   #   branches: [ main ]
   # Uncomment the 'pull_request' line below to trigger the workflow in PR
-  # pull_request:
+  pull_request:
     # types: [ready_for_review]
     # paths:
     #  - 'pygmt/**'

pygmt/tests/test_binstats.py

@@ -6,7 +6,9 @@
 
 import numpy.testing as npt
 import pytest
+from packaging.version import Version
 from pygmt import binstats
+from pygmt.clib import __gmt_version__
 from pygmt.enums import GridRegistration, GridType
 from pygmt.helpers import GMTTempFile
 
@@ -67,7 +69,13 @@ def test_binstats_quantile():
     assert temp_grid.dims == ("y", "x")
     assert temp_grid.gmt.gtype is GridType.CARTESIAN
     assert temp_grid.gmt.registration is GridRegistration.GRIDLINE
+    assert temp_grid.dtype == "float32"
     npt.assert_allclose(temp_grid.max(), 15047685)
-    npt.assert_allclose(temp_grid.min(), 53)
-    npt.assert_allclose(temp_grid.median(), 543664.5)
-    npt.assert_allclose(temp_grid.mean(), 1661363.6)
+    if Version(__gmt_version__) > Version("6.4.0"):
+        npt.assert_allclose(temp_grid.min(), 53)
+        npt.assert_allclose(temp_grid.median(), 543664.5)
+        npt.assert_allclose(temp_grid.mean(), 1661363.6)
+    else:  # TODO(GMT>=6.5.0): Remove if-condition with different min/median/mean values
+        npt.assert_allclose(temp_grid.min(), 0)
+        npt.assert_allclose(temp_grid.median(), 330700.0)
+        npt.assert_allclose(temp_grid.mean(), 1459889.1)