code: def test_merge_multiple_cols_with_mixed_cols_index(self):
      # GH29522
      s = Series(
          range(6),
          MultiIndex.from_product(
              [["A", "B"], [1, 2, 3]], names=["lev1", "lev2"]
          ),
          name="Amount",
      )
      df = DataFrame(
          {"lev1": list("AAABBB"), "lev2": [1, 2, 3, 1, 2, 3], "col": 0}
      )
      result = merge(df, s.reset_index(), on=["lev1", "lev2"])
      expected = DataFrame(
          {
              "lev1": list("AAABBB"),
              "lev2": [1, 2, 3, 1, 2, 3],
              "col": [0] * 6,
              "Amount": range(6),
          }
      )
      tm.assert_frame_equal(result, expected)
  
imports: import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import DataFrame, Index, MultiIndex, RangeIndex, Series, Timestamp, option_context
  import pandas._testing
  from pandas.core.reshape.concat import concat
  from pandas.core.reshape.merge import merge
label_desc: Use image node_id 4 for calling the TestMergeMulti obj's underlying member method code with example usage: obj.test_merge_multiple_cols_with_mixed_cols_index() without return types