code: def test_series_align_multiindex_with_nan_overlap_only(self):
      # GH 38439
      mi1 = MultiIndex.from_arrays([[81.0, np.nan], [np.nan, np.nan]])
      mi2 = MultiIndex.from_arrays([[np.nan, 82.0], [np.nan, np.nan]])
      ser1 = Series([1, 2], index=mi1)
      ser2 = Series([1, 2], index=mi2)
      result1, result2 = ser1.align(ser2)
  
      mi = MultiIndex.from_arrays(
          [[81.0, 82.0, np.nan], [np.nan, np.nan, np.nan]]
      )
      expected1 = Series([1.0, np.nan, 2.0], index=mi)
      expected2 = Series([np.nan, 2.0, 1.0], index=mi)
  
      tm.assert_series_equal(result1, expected1)
      tm.assert_series_equal(result2, expected2)
  
imports: import numpy
  import pytest
  import pandas._libs.index
  from pandas.errors import PerformanceWarning
  import pandas
  from pandas import CategoricalDtype, DataFrame, Index, MultiIndex, Series
  import pandas._testing
  from pandas.core.arrays.boolean import BooleanDtype
label_desc: Use image node_id 9 for calling the TestMultiIndexBasic obj's underlying member method code with example usage: obj.test_series_align_multiindex_with_nan_overlap_only() without return types