code: def test_get_loc_single_level(self):
      single_level = MultiIndex(
          levels=[["foo", "bar", "baz", "qux"]],
          codes=[[0, 1, 2, 3]],
          names=["first"],
      )
      s = Series(
          np.random.default_rng(2).standard_normal(len(single_level)),
          index=single_level,
      )
      for k in single_level.values:
          s[k]
  
imports: import numpy
  import pytest
  from pandas.errors import IndexingError, PerformanceWarning
  import pandas
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
label_desc: Use image node_id 14 for calling the TestMultiIndexLoc obj's underlying member method code with example usage: obj.test_get_loc_single_level() without return types