code: def test_atan2_(self):
      self.run_test(
          "def atan2_(a,b):\n from math import atan2\n return atan2(a,b)",
          2,
          4,
          atan2_=[int, int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 18 for calling the TestMath obj's underlying member method code with example usage: obj.test_atan2_() without return types