code: def test_sub_datetime64_reso_mismatch(self):
      dti = pd.date_range("2016-01-01", periods=3)
      left = dti._data.as_unit("s")
      right = left.as_unit("ms")
  
      result = left - right
      exp_values = np.array([0, 0, 0], dtype="m8[ms]")
      expected = TimedeltaArray._simple_new(
          exp_values,
          dtype=exp_values.dtype,
      )
      tm.assert_extension_array_equal(result, expected)
      result2 = right - left
      tm.assert_extension_array_equal(result2, expected)
  
imports: from __future__ import annotations
  from datetime import timedelta
  import operator
  import numpy
  import pytest
  from pandas._libs.tslibs import tz_compare
  from pandas.core.dtypes.dtypes import DatetimeTZDtype
  import pandas
  import pandas._testing
  from pandas.core.arrays import DatetimeArray, TimedeltaArray
label_desc: Use image node_id 21 for calling the TestNonNano obj's underlying member method code with example usage: obj.test_sub_datetime64_reso_mismatch() without return types