code: def test_timestamp_invalid_key(self, key):
      # GH#20464
      tdi = timedelta_range(0, periods=10)
      with pytest.raises(KeyError, match=re.escape(repr(key))):
          tdi.get_loc(key)
  
imports: from datetime import datetime
  import re
  import numpy
  import pytest
  from pandas import Index, NaT, Timedelta, TimedeltaIndex, Timestamp, notna, offsets, timedelta_range, to_timedelta
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestGetItem obj's underlying member method code with example usage: obj.test_timestamp_invalid_key(key) without return types