code: def test_multiindex_one_dimensional_tuple_columns(self, indexer):
      # GH#37711
      mi = MultiIndex.from_tuples([("a", "A"), ("b", "A")])
      obj = DataFrame([1, 2], index=mi)
      obj.loc[indexer, :] = 0
      expected = DataFrame([0, 2], index=mi)
      tm.assert_frame_equal(obj, 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 18 for calling the TestMultiIndexLoc obj's underlying member method code with example usage: obj.test_multiindex_one_dimensional_tuple_columns(indexer) without return types