code: def test_to_csv_timedelta_precision(self):
      # GH 6783
      s = pd.Series([1, 1]).astype("timedelta64[ns]")
      buf = io.StringIO()
      s.to_csv(buf)
      result = buf.getvalue()
      expected_rows = [
          ",0",
          "0,0 days 00:00:00.000000001",
          "1,0 days 00:00:00.000000001",
      ]
      expected = tm.convert_rows_list_to_csv_str(expected_rows)
      assert result == expected
  
imports: import io
  import os
  import sys
  from zipfile import ZipFile
  from _csv import Error
  import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, compat
  import pandas._testing
label_desc: Use image node_id 31 for calling the TestToCSV obj's underlying member method code with example usage: obj.test_to_csv_timedelta_precision() without return types