TST: fix datetime test for pandas 2.0 (preserves ms resolution) (#239)

Author: jorisvandenbossche

pyogrio/tests/test_geopandas_io.py

@@ -1,5 +1,6 @@
 from datetime import datetime
 import os
+from packaging.version import Version
 
 import numpy as np
 import pytest
@@ -130,7 +131,11 @@ def test_read_layer_invalid(naturalearth_lowres_all_ext):
 @pytest.mark.filterwarnings("ignore: Measured")
 def test_read_datetime(test_fgdb_vsi):
     df = read_dataframe(test_fgdb_vsi, layer="test_lines", max_features=1)
-    assert df.SURVEY_DAT.dtype.name == "datetime64[ns]"
+    if Version(pd.__version__) >= Version("2.0.0"):
+        # starting with pandas 2.0, it preserves the passed datetime resolution
+        assert df.SURVEY_DAT.dtype.name == "datetime64[ms]"
+    else:
+        assert df.SURVEY_DAT.dtype.name == "datetime64[ns]"
 
 
 def test_read_null_values(test_fgdb_vsi):