code: def test_astype_no_pandas_dtype(self):
      # https://github.com/pandas-dev/pandas/pull/24866
      ser = Series([1, 2], dtype="int64")
      # Don't have NumpyEADtype in the public API, so we use `.array.dtype`,
      # which is a NumpyEADtype.
      result = ser.astype(ser.array.dtype)
      tm.assert_series_equal(result, ser)
  
imports: from datetime import datetime, timedelta
  from importlib import reload
  import string
  import sys
  import numpy
  import pytest
  from pandas._libs.tslibs import iNaT
  import pandas.util._test_decorators
  from pandas import NA, Categorical, CategoricalDtype, DatetimeTZDtype, Index, Interval, NaT, Series, Timedelta, Timestamp, cut, date_range, to_datetime
  import pandas._testing
label_desc: Use image node_id 6 for calling the TestAstype obj's underlying member method code with example usage: obj.test_astype_no_pandas_dtype() without return types