code: def test_idm(self):
      self.run_test(
          "def idm(x): return list(map(lambda b: b, x))",
          [1, 2, 3],
          idm=[List[int]],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import *
label_desc: Use image node_id 8 for calling the TestCopperhead obj's underlying member method code with example usage: obj.test_idm() without return types