code: def test_saxpy(self):
      self.run_test(
          "def saxpy(a, x, y): return list(map(lambda xi, yi: a * xi + yi, x, y))",
          1.5,
          [1, 2, 3],
          [0.0, 2.0, 4.0],
          saxpy=[float, List[int], List[float]],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import *
label_desc: Use image node_id 1 for calling the TestCopperhead obj's underlying member method code with example usage: obj.test_saxpy() without return types