code: def test_unicodize_deep_nested():
      assert strings.unicodize_deep(
          {
              "key 1": "value 1",
              "ключ 2": {
                  "subkey 1": "value 1",
                  "подключ 2": "значение 2",
                  "подключ 3".encode("utf-8"): "значение 3".encode(
                      "utf-8"
                  ),
              },
          }
      ) == {
          "key 1": "value 1",
          "ключ 2": {
              "subkey 1": "value 1",
              "подключ 2": "значение 2",
              "подключ 3": "значение 3",
          },
      }
  
imports: import pytest
  import six
  from library.python import strings
label_desc: Use image node_id 15 for calling a global function with example usage: test_unicodize_deep_nested() without return types