code: def test_loc_getitem_series(self):
      # GH14730
      # passing a series as a key with a MultiIndex
      index = MultiIndex.from_product([[1, 2, 3], ["A", "B", "C"]])
      x = Series(index=index, data=range(9), dtype=np.float64)
      y = Series([1, 3])
      expected = Series(
          data=[0, 1, 2, 6, 7, 8],
          index=MultiIndex.from_product([[1, 3], ["A", "B", "C"]]),
          dtype=np.float64,
      )
      result = x.loc[y]
      tm.assert_series_equal(result, expected)
  
      result = x.loc[[1, 3]]
      tm.assert_series_equal(result, expected)
  
      # GH15424
      y1 = Series([1, 3], index=[1, 2])
      result = x.loc[y1]
      tm.assert_series_equal(result, expected)
  
      empty = Series(data=[], dtype=np.float64)
      expected = Series(
          [],
          index=MultiIndex(
              levels=index.levels, codes=[[], []], dtype=np.float64
          ),
          dtype=np.float64,
      )
      result = x.loc[empty]
      tm.assert_series_equal(result, expected)
  
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 5 for calling the TestMultiIndexLoc obj's underlying member method code with example usage: obj.test_loc_getitem_series() without return types