code: def test_warns_non_roundtrippable_names(self, idx):
      # GH 19130
      df = DataFrame(index=idx)
      df.index.name = "index"
      with tm.assert_produces_warning():
          set_default_names(df)
  
imports: from collections import OrderedDict
  from io import StringIO
  import json
  import numpy
  import pytest
  from pandas.core.dtypes.dtypes import CategoricalDtype, DatetimeTZDtype, PeriodDtype
  import pandas
  from pandas import DataFrame
  import pandas._testing
  from pandas.io.json._table_schema import as_json_table_type, build_table_schema, convert_json_field_to_pandas_type, convert_pandas_type_to_json_field, set_default_names
label_desc: Use image node_id 17 for calling the TestTableOrient obj's underlying member method code with example usage: obj.test_warns_non_roundtrippable_names(idx) without return types