code: def test_type_timestamp_with_tz():
      tz = "America/Los_Angeles"
      t = pa.timestamp("ns", tz=tz)
      assert t.unit == "ns"
      assert t.tz == tz
  
imports: from collections import OrderedDict
  import sys
  import weakref
  import pytest
  import numpy
  import pyarrow
  import pyarrow.tests.util
  from pyarrow.vendored.version import Version
label_desc: Use image node_id 9 for calling a global function with example usage: test_type_timestamp_with_tz() without return types