code: def test_datetime(cls):
      assert_dshape_equal(cls(), cls())
      assert_dshape_equal(cls("US/Eastern"), cls("US/Eastern"))
  
      with pytest.raises(AssertionError) as e:
          assert_dshape_equal(cls("US/Eastern"), cls("US/Central"))
      assert "'US/Eastern' != 'US/Central'" in str(e.value)
      assert "_.tz" in str(e.value)
  
      assert_dshape_equal(
          cls("US/Eastern"),
          cls("US/Central"),
          check_tz=False,
      )
  
file_path: datashader/datashader/datashape/util/tests/test_testing.py
imports: import pytest
  from datashader.datashape.coretypes import DateTime, R, String, Time, TimeDelta, Tuple, Option, int32, float32
  from datashader.datashape.util import dshape
  from datashader.datashape.util.testing import assert_dshape_equal
label_desc: Use image node_id 8 for calling a global function with example usage: test_datetime(cls) without return types