code: def test_utf8_chars(self):
      words = ["hello", "💩", "¯\\_(ツ)_/¯", "今日"]
      for word in words:
          self.assertEqual(list(word), utf8_chars(word))
  
file_path: pytext/pytext/torchscript/tests/test_tokenizer.py
imports: import io
  import pickle
  import unittest
  import torch
  from pytext.torchscript.tokenizer import ScriptBPE, ScriptWordTokenizer
  from pytext.torchscript.utils import make_byte_inputs, utf8_chars
label_desc: Use image node_id 1 for calling the BPETest obj's underlying member method code with example usage: obj.test_utf8_chars() without return types