docstr: The count method should return a value of 0
  when nothing has been saved to the database.
code: def test_count_returns_zero(self):
      """
      The count method should return a value of 0
      when nothing has been saved to the database.
      """
      self.assertEqual(self.adapter.count(), 0)
  
imports: from unittest import TestCase
  from chatterbot.conversation import Statement
  from chatterbot.storage.sql_storage import SQLStorageAdapter
label_desc: Use image node_id 3 for calling the SQLStorageAdapterTests obj's underlying member method code with example usage: obj.test_count_returns_zero() without return types