code: def test_get_loc_decreasing(self, values):
      # GH 25860
      index = IntervalIndex.from_arrays(values[1:], values[:-1])
      result = index.get_loc(index[0])
      expected = 0
      assert result == expected
  
imports: import re
  import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import NA, CategoricalIndex, DatetimeIndex, Index, Interval, IntervalIndex, MultiIndex, NaT, Timedelta, Timestamp, array, date_range, interval_range, isna, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 7 for calling the TestGetLoc obj's underlying member method code with example usage: obj.test_get_loc_decreasing(values) without return types