code: def test_subs_empty():
      assert subs({})(Basic(S(1), S(2))) == Basic(S(1), S(2))
  
imports: from sympy.strategies.tools import subs, typed
  from sympy.strategies.rl import rm_id
  from sympy.core.basic import Basic
  from sympy.core.singleton import S
label_desc: Use image node_id 2 for calling a global function with example usage: test_subs_empty() without return types