code: def test_add():
      assert h + l == h + x == 1
      assert l + h == x + h == 2
      assert x + l == l + x == x - 1
  
imports: from sympy.core.decorators import call_highest_priority
  from sympy.core.expr import Expr
  from sympy.core.mod import Mod
  from sympy.core.numbers import Integer
  from sympy.core.symbol import Symbol
  from sympy.functions.elementary.integers import floor
label_desc: Use image node_id 2 for calling a global function with example usage: test_add() without return types