code: def test_round_nonstandard_freq(self):
      with tm.assert_produces_warning(False):
          Timestamp("2016-10-17 12:00:00.001501031").round("1010ns")
  
imports: from hypothesis import given, strategies
  import numpy
  import pytest
  import pytz
  from pandas._libs import lib
  from pandas._libs.tslibs import NaT, OutOfBoundsDatetime, Timedelta, Timestamp, iNaT, to_offset
  from pandas._libs.tslibs.dtypes import NpyDatetimeUnit
  from pandas._libs.tslibs.period import INVALID_FREQ_ERR_MSG
  import pandas._testing
label_desc: Use image node_id 6 for calling the TestTimestampRound obj's underlying member method code with example usage: obj.test_round_nonstandard_freq() without return types