code: def test_field_metadata(self):
      self.round_trip_field(
          lambda: pa.field("aa", pa.bool_(), {"a": "b"})
      )
  
imports: import decimal
  import gc
  import os
  import sys
  import unittest
  import xml.etree.ElementTree
  import jpype
  import pyarrow
  import pyarrow.ipc
  from pyarrow.cffi import ffi
label_desc: Use image node_id 18 for calling the TestPythonIntegration obj's underlying member method code with example usage: obj.test_field_metadata() without return types