code: def test_astype_numpy_to_ea():
      ser = Series([1, 2, 3])
      with pd.option_context("mode.copy_on_write", True):
          result = ser.astype("Int64")
      assert np.shares_memory(get_array(ser), get_array(result))
  
imports: import pickle
  import numpy
  import pytest
  from pandas.compat.pyarrow import pa_version_under12p0
  import pandas
  from pandas import DataFrame, Series, Timestamp, date_range
  import pandas._testing
  from pandas.tests.copy_view.util import get_array
label_desc: Use image node_id 4 for calling a global function with example usage: test_astype_numpy_to_ea() without return types