code: def test_factorial_(self):
      self.run_test(
          "def factorial_(a):\n from math import factorial\n return factorial(a)",
          2,
          factorial_=[int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 34 for calling the TestMath obj's underlying member method code with example usage: obj.test_factorial_() without return types