code: def test_unit_m_y_raises(self, unit):
      msg = "Units 'M', 'Y', and 'y' are no longer supported"
      depr_msg = "The 'unit' keyword in TimedeltaIndex construction is deprecated"
      with pytest.raises(ValueError, match=msg):
          with tm.assert_produces_warning(
              FutureWarning, match=depr_msg
          ):
              TimedeltaIndex([1, 3, 7], unit)
  
imports: from datetime import timedelta
  import numpy
  import pytest
  import pandas
  from pandas import Timedelta, TimedeltaIndex, timedelta_range, to_timedelta
  import pandas._testing
  from pandas.core.arrays.timedeltas import TimedeltaArray
label_desc: Use image node_id 3 for calling the TestTimedeltaIndex obj's underlying member method code with example usage: obj.test_unit_m_y_raises(unit) without return types