code: def test_round_invalid_arg(self):
      stamp = Timestamp("2000-01-05 05:09:15.13")
      with pytest.raises(ValueError, match=INVALID_FREQ_ERR_MSG):
          stamp.round("foo")
  
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 7 for calling the TestTimestampRound obj's underlying member method code with example usage: obj.test_round_invalid_arg() without return types