code: def test_period_index_from_datetime_index_invalid_freq(self, freq):
      # GH#56899
      msg = f"Invalid frequency: {freq[1:]}"
  
      rng = date_range("01-Jan-2012", periods=8, freq=freq)
      with pytest.raises(ValueError, match=msg):
          rng.to_period()
  
imports: import numpy
  import pytest
  from pandas._libs.tslibs.period import IncompatibleFrequency
  from pandas.core.dtypes.dtypes import PeriodDtype
  from pandas import Index, NaT, Period, PeriodIndex, Series, date_range, offsets, period_range
  import pandas._testing
  from pandas.core.arrays import PeriodArray
label_desc: Use image node_id 3 for calling the TestPeriodIndexDisallowedFreqs obj's underlying member method code with example usage: obj.test_period_index_from_datetime_index_invalid_freq(freq) without return types