code: def test_dict_len(self):
      self.run_test(
          "def dict_len(d): return len(d)",
          {1: "e", 2: "f"},
          dict_len=[Dict[int, str]],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import Dict, List
label_desc: Use image node_id 12 for calling the TestDict obj's underlying member method code with example usage: obj.test_dict_len() without return types