code: def test_set_database_uri_none(self):
      adapter = SQLStorageAdapter(database_uri=None)
      self.assertEqual(adapter.database_uri, "sqlite://")
  
imports: from unittest import TestCase
  from chatterbot.conversation import Statement
  from chatterbot.storage.sql_storage import SQLStorageAdapter
label_desc: Use image node_id 1 for calling the SQLStorageAdapterTests obj's underlying member method code with example usage: obj.test_set_database_uri_none() without return types