code: def test_conf_scope_does_not_contain_fallback():
      config_dict = ConfigDict({"answer": 42})
  
      cfg = config_dict(fallback={"a": 21, "b": 10})
  
      assert set(cfg.keys()) == {"answer"}
  
imports: import pytest
  import sacred.optional
  from sacred.config import ConfigDict
  from sacred.config.custom_containers import DogmaticDict, DogmaticList
label_desc: Use image node_id 15 for calling a global function with example usage: test_conf_scope_does_not_contain_fallback() without return types