code: def test_unicodize_deep_plain():
      assert strings.unicodize_deep("str") == "str"
      assert strings.unicodize_deep("юникод") == "юникод"
      assert (
          strings.unicodize_deep("юникод".encode("utf-8")) == "юникод"
      )
  
imports: import pytest
  import six
  from library.python import strings
label_desc: Use image node_id 16 for calling a global function with example usage: test_unicodize_deep_plain() without return types