code: def test_stringize_deep_plain():
      assert (
          strings.stringize_deep("str") == "str" if six.PY2 else b"str"
      )
      assert strings.stringize_deep("юникод") == "юникод".encode(
          "utf-8"
      )
      assert strings.stringize_deep(
          "юникод".encode("utf-8")
      ) == "юникод".encode("utf-8")
  
imports: import pytest
  import six
  from library.python import strings
label_desc: Use image node_id 12 for calling a global function with example usage: test_stringize_deep_plain() without return types