code: def test_s_input():
      expr = Basic(S(1), S(2))
      a, b = map(Symbol, "ab")
      pattern = Basic(a, b)
      assert list(unify(expr, pattern, {}, (a, b))) == [{a: 1, b: 2}]
      assert list(unify(expr, pattern, {a: 5}, (a, b))) == []
  
imports: from sympy.core.add import Add
  from sympy.core.basic import Basic
  from sympy.core.containers import Tuple
  from sympy.core.singleton import S
  from sympy.core.symbol import Symbol, symbols
  from sympy.logic.boolalg import And
  from sympy.core.symbol import Str
  from sympy.unify.core import Compound, Variable
  from sympy.unify.usympy import deconstruct, construct, unify, is_associative, is_commutative
  from sympy.abc import x, y, z, n
label_desc: Use image node_id 6 for calling a global function with example usage: test_s_input() without return types