code: def test_acos_(self):
      self.run_test(
          "def acos_(a):\n from math import acos\n return acos(a)",
          1,
          acos_=[int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 28 for calling the TestMath obj's underlying member method code with example usage: obj.test_acos_() without return types