code: def test_difference_sort_special():
      # GH-24959
      idx = MultiIndex.from_product([[1, 0], ["a", "b"]])
      # sort=None, the default
      result = idx.difference([])
      tm.assert_index_equal(result, idx)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import CategoricalIndex, DataFrame, Index, IntervalIndex, MultiIndex, Series
  import pandas._testing
  from pandas.api.types import is_float_dtype, is_unsigned_integer_dtype
label_desc: Use image node_id 9 for calling a global function with example usage: test_difference_sort_special() without return types