code: def test_to_xarray_with_multiindex(self):
      from xarray import DataArray
  
      mi = MultiIndex.from_product(
          [["a", "b"], range(3)], names=["one", "two"]
      )
      ser = Series(range(6), dtype="int64", index=mi)
      result = ser.to_xarray()
      assert len(result) == 2
      tm.assert_almost_equal(list(result.coords.keys()), ["one", "two"])
      assert isinstance(result, DataArray)
      res = result.to_series()
      tm.assert_series_equal(res, ser)
  
file_path: pandas/pandas/tests/generic/test_to_xarray.py
imports: import numpy
  import pytest
  from pandas import Categorical, DataFrame, MultiIndex, Series, date_range
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestSeriesToXArray obj's underlying member method code with example usage: obj.test_to_xarray_with_multiindex() without return types