code: def test_int64_overflow_how_merge(self, left_right, join_type):
      left, right = left_right
  
      out = merge(left, right, how="outer")
      out.sort_values(out.columns.tolist(), inplace=True)
      out.index = np.arange(len(out))
      tm.assert_frame_equal(
          out, merge(left, right, how=join_type, sort=True)
      )
  
imports: from collections import defaultdict
  from datetime import datetime
  from itertools import product
  import numpy
  import pytest
  from pandas import NA, DataFrame, MultiIndex, Series, array, concat, merge
  import pandas._testing
  from pandas.core.algorithms import safe_sort
  import pandas.core.common
  from pandas.core.sorting import _decons_group_index, get_group_index, is_int64_overflow_possible, lexsort_indexer, nargsort
label_desc: Use image node_id 3 for calling the TestMerge obj's underlying member method code with example usage: obj.test_int64_overflow_how_merge(left_right, join_type) without return types