code: def test_copysign_(self):
      self.run_test(
          "def copysign_(a,b):\n from math import copysign\n return copysign(a,b)",
          2,
          -2,
          copysign_=[int, int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 27 for calling the TestMath obj's underlying member method code with example usage: obj.test_copysign_() without return types