code: def test_astype_arrow_timestamp(using_copy_on_write):
      pytest.importorskip("pyarrow")
      df = DataFrame(
          {
              "a": [
                  Timestamp("2020-01-01 01:01:01.000001"),
                  Timestamp("2020-01-01 01:01:01.000001"),
              ]
          },
          dtype="M8[ns]",
      )
      result = df.astype("timestamp[ns][pyarrow]")
      if using_copy_on_write:
          assert not result._mgr._has_no_reference(0)
          if pa_version_under12p0:
              assert not np.shares_memory(
                  get_array(df, "a"), get_array(result, "a")._pa_array
              )
          else:
              assert np.shares_memory(
                  get_array(df, "a"), get_array(result, "a")._pa_array
              )
  
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 12 for calling a global function with example usage: test_astype_arrow_timestamp(using_copy_on_write) without return types