code: def test_atan_(self):
      self.run_test(
          "def atan_(a):\n from math import atan\n return atan(a)",
          1,
          atan_=[int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 17 for calling the TestMath obj's underlying member method code with example usage: obj.test_atan_() without return types