code: def test_to_xarray_index_types(self, index_flat):
      index = index_flat
      # MultiIndex is tested in test_to_xarray_with_multiindex
  
      from xarray import DataArray
  
      ser = Series(range(len(index)), index=index, dtype="int64")
      ser.index.name = "foo"
      result = ser.to_xarray()
      repr(result)
      assert len(result) == len(index)
      assert len(result.coords) == 1
      tm.assert_almost_equal(list(result.coords.keys()), ["foo"])
      assert isinstance(result, DataArray)
  
      # idempotency
      tm.assert_series_equal(result.to_series(), 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 1 for calling the TestSeriesToXArray obj's underlying member method code with example usage: obj.test_to_xarray_index_types(index_flat) without return types