code: def test_merge_dicts(self):
      d1 = {"word1": 5, "word2": 1, "word3": 2}
      d2 = {"word1": 2, "word3": 3, "word4": 10}
  
      res_dict = utils.merge_counts(d1, d2)
      expected_dict = {"word1": 7, "word2": 1, "word3": 5, "word4": 10}
      self.assertEqual(res_dict, expected_dict)
  
imports: import logging
  import unittest
  import numpy
  from gensim import utils
  from gensim.test.utils import datapath, get_tmpfile
label_desc: Use image node_id 1 for calling the TestMergeDicts obj's underlying member method code with example usage: obj.test_merge_dicts() without return types