code: def test_init(self):
      # Test that the shards were actually created during setUp
      self.assertTrue(os.path.isfile(self.tmp_fname + ".1"))
  
imports: import os
  import unittest
  import random
  import shutil
  import numpy
  from scipy import sparse
  from gensim.utils import is_corpus, mock_data
  from gensim.corpora.sharded_corpus import ShardedCorpus
label_desc: Use image node_id 3 for calling the TestShardedCorpus obj's underlying member method code with example usage: obj.test_init() without return types