code: def test_astype_int(self, dtype):
      arr = DatetimeArray._from_sequence(
          [pd.Timestamp("2000"), pd.Timestamp("2001")], dtype="M8[ns]"
      )
  
      if np.dtype(dtype) != np.int64:
          with pytest.raises(
              TypeError, match=r"Do obj.astype\('int64'\)"
          ):
              arr.astype(dtype)
          return
  
      result = arr.astype(dtype)
      expected = arr._ndarray.view("i8")
      tm.assert_numpy_array_equal(result, 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 6 for calling the TestDatetimeArray obj's underlying member method code with example usage: obj.test_astype_int(dtype) without return types