code: def test_gamma():
      assert Hyper_Function([2, 3], [-1]).gamma == 0
      assert Hyper_Function([-2, -3], [-1]).gamma == 2
      n = Dummy(integer=True)
      assert Hyper_Function([-1, n, 1], []).gamma == 1
      assert Hyper_Function([-1, -n, 1], []).gamma == 1
      p = Dummy(integer=True, positive=True)
      assert Hyper_Function([-1, p, 1], []).gamma == 1
      assert Hyper_Function([-1, -p, 1], []).gamma == 2
  
file_path: sympy/sympy/simplify/tests/test_function.py
imports: from sympy.core import symbols, Dummy, Tuple, S, Rational
  from sympy.functions import hyper
  from sympy.simplify.hyperexpand import Hyper_Function
label_desc: Use image node_id 5 for calling a global function with example usage: test_gamma() without return types