code: def test_round_frac(val, precision, expected):
      # see gh-1979
      result = tmod._round_frac(val, precision=precision)
      assert result == expected
  
imports: import numpy
  import pytest
  import pandas
  from pandas import Categorical, DataFrame, DatetimeIndex, Index, Interval, IntervalIndex, Series, TimedeltaIndex, Timestamp, cut, date_range, interval_range, isna, qcut, timedelta_range, to_datetime
  import pandas._testing
  from pandas.api.types import CategoricalDtype
  import pandas.core.reshape.tile
label_desc: Use image node_id 24 for calling a global function with example usage: test_round_frac(val, precision, expected) without return types