code: def test_fifth_week_of_month_infer():
      # see gh-9425
      #
      # Only attempt to infer up to WOM-4.
      index = DatetimeIndex(["2014-03-31", "2014-06-30", "2015-03-30"])
      assert frequencies.infer_freq(index) is None
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas._libs.tslibs.ccalendar import DAYS, MONTHS
  from pandas._libs.tslibs.offsets import _get_offset
  from pandas._libs.tslibs.period import INVALID_FREQ_ERR_MSG
  from pandas.compat import is_platform_windows
  from pandas import DatetimeIndex, Index, RangeIndex, Series, Timestamp, date_range, period_range
  import pandas._testing
  from pandas.core.arrays import DatetimeArray, TimedeltaArray
  from pandas.core.tools.datetimes import to_datetime
  from pandas.tseries import frequencies, offsets
label_desc: Use image node_id 9 for calling a global function with example usage: test_fifth_week_of_month_infer() without return types