code: def test_proxy_local(self):
      tableset = TableSet(
          self.tables.values(), self.tables.keys(), key_name="foo"
      )
  
      self.assertEqual(tableset._key_name, "foo")
  
imports: import json
  import shutil
  from collections import OrderedDict
  from io import StringIO
  from agate import Table, TableSet
  from agate.computations import Formula
  from agate.data_types import Number, Text
  from agate.testcase import AgateTestCase
label_desc: Use image node_id 22 for calling the TestTableSet obj's underlying member method code with example usage: obj.test_proxy_local() without return types