code: def test_type_string():
      t = pa.string()
      assert str(t) == "string"
  
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 8 for calling a global function with example usage: test_type_string() without return types