code: def test_xs_level0(self, indexer, four_level_index_dataframe):
      df = four_level_index_dataframe
      expected_values = [
          [-0.5109, -2.3358, -0.4645, 0.05076, 0.364],
          [0.4473, 1.4152, 0.2834, 1.00661, 0.1744],
      ]
      expected_index = MultiIndex(
          levels=[["b", "q"], [10.0032, 20.0], [4, 5]],
          codes=[[0, 1], [0, 1], [1, 0]],
          names=["two", "three", "four"],
      )
      expected = DataFrame(
          expected_values, index=expected_index, columns=list("ABCDE")
      )
  
      result = indexer(df)
      tm.assert_frame_equal(result, expected)
  
imports: import re
  import numpy
  import pytest
  from pandas.errors import SettingWithCopyError
  from pandas import DataFrame, Index, IndexSlice, MultiIndex, Series, concat
  import pandas._testing
  from pandas.tseries.offsets import BDay
label_desc: Use image node_id 11 for calling the TestXSWithMultiIndex obj's underlying member method code with example usage: obj.test_xs_level0(indexer, four_level_index_dataframe) without return types