code: def test_handle_overlap_arbitrary_key(self, df, df2):
      joined = merge(
          df,
          df2,
          left_on="key2",
          right_on="key1",
          suffixes=(".foo", ".bar"),
      )
      assert "key1.foo" in joined
      assert "key2.bar" in joined
  
imports: import re
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Categorical, DataFrame, Index, MultiIndex, Series, Timestamp, bdate_range, concat, merge, option_context
  import pandas._testing
label_desc: Use image node_id 9 for calling the TestJoin obj's underlying member method code with example usage: obj.test_handle_overlap_arbitrary_key(df, df2) without return types