code: def test_constructor_no_precision_raises(self):
      # GH-24753, GH-24739
  
      msg = "with no precision is not allowed"
      with pytest.raises(ValueError, match=msg):
          TimedeltaIndex(["2000"], dtype="timedelta64")
  
      msg = "The 'timedelta64' dtype has no unit. Please pass in"
      with pytest.raises(ValueError, match=msg):
          pd.Index(["2000"], dtype="timedelta64")
  
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 16 for calling the TestTimedeltaIndex obj's underlying member method code with example usage: obj.test_constructor_no_precision_raises() without return types