code: def test_cast_timestamp_to_string():
      # GH-35370
      pytest.importorskip("pytz")
      import pytz
  
      dt = datetime.datetime(2000, 1, 1, 0, 0, 0, tzinfo=pytz.utc)
      ts = pa.scalar(dt, type=pa.timestamp("ns", tz="UTC"))
      assert ts.cast(pa.string()) == pa.scalar(
          "2000-01-01 00:00:00.000000000Z"
      )
  
imports: import datetime
  import decimal
  import pytest
  import sys
  import weakref
  import numpy
  import pyarrow
  import pyarrow.compute
  from pyarrow.tests import util
label_desc: Use image node_id 17 for calling a global function with example usage: test_cast_timestamp_to_string() without return types