code: def test_to_csv_idx_ncols(self, nrows, ncols):
      df = DataFrame(
          np.ones((nrows, ncols)),
          index=Index([f"i-{i}" for i in range(nrows)], name="a"),
          columns=Index([f"i-{i}" for i in range(ncols)], name="a"),
      )
      result, expected = self._return_result_expected(df, 1000)
      tm.assert_frame_equal(result, expected, check_names=False)
  
imports: import csv
  from io import StringIO
  import os
  import numpy
  import pytest
  from pandas.errors import ParserError
  import pandas
  from pandas import DataFrame, Index, MultiIndex, NaT, Series, Timestamp, date_range, period_range, read_csv, to_datetime
  import pandas._testing
  import pandas.core.common
  from pandas.io.common import get_handle
label_desc: Use image node_id 13 for calling the TestDataFrameToCSV obj's underlying member method code with example usage: obj.test_to_csv_idx_ncols(nrows, ncols) without return types