code: def test_str_join2(self):
      self.run_test(
          "def str_join2(a): return 'o'.join(filter(len, a))",
          ["l", "l"],
          str_join2=[List[str]],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import List
  import unittest
label_desc: Use image node_id 34 for calling the TestStr obj's underlying member method code with example usage: obj.test_str_join2() without return types