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