code: def test_isinf_(self):
      self.run_test(
          "def isinf_(a):\n from math import isinf\n n=1\n while not isinf(a):\n  a=a*a\n  n+=1\n return isinf(a)",
          2.0,
          isinf_=[float],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 37 for calling the TestMath obj's underlying member method code with example usage: obj.test_isinf_() without return types