code: def test_config_singleton(self):
      c1 = Config()
      c2 = Config()
      assert c1 == c2
      c1.test = "foo"
      assert c2.test == "foo"
  
file_path: datmo/datmo/tests/test_config.py
imports: import os
  import tempfile
  import platform
  from datmo.config import Config
label_desc: Use image node_id 3 for calling the TestConfigModule obj's underlying member method code with example usage: obj.test_config_singleton() without return types