code: def test_length_zero_copy(dtype, copy):
      arr = np.array([], dtype=dtype)
      result = astype_overflowsafe(
          arr, copy=copy, dtype=np.dtype("M8[ns]")
      )
      if copy:
          assert not np.shares_memory(result, arr)
      elif arr.dtype == result.dtype:
          assert result is arr
      else:
          assert not np.shares_memory(result, arr)
  
file_path: pandas/pandas/tests/tslibs/test_conversion.py
imports: from datetime import datetime
  import numpy
  import pytest
  from pytz import UTC
  from pandas._libs.tslibs import OutOfBoundsTimedelta, astype_overflowsafe, conversion, iNaT, timezones, tz_convert_from_utc, tzconversion
  from pandas import Timestamp, date_range
  import pandas._testing
label_desc: Use image node_id 8 for calling a global function with example usage: test_length_zero_copy(dtype, copy) without return types