code: def test_gamma_(self):
      self.run_test(
          "def gamma_(a):\n from math import gamma\n return gamma(a)",
          1,
          gamma_=[int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 31 for calling the TestMath obj's underlying member method code with example usage: obj.test_gamma_() without return types