def METHOD_NAME(self):
    super().METHOD_NAME()
    # Use a simpler test file without japanese/chinese characters
    with open(f"{get_tests_dir()}/fixtures/sample_text_no_unicode.txt", encoding="utf-8") as f_data:
        self._data = f_data.read().replace("\n\n", "\n").strip()
    vocab = [
        "<s>",
        "</s>",
        "l",
        "o",
        "w",
        "e",
        "r",
        "s",
        "t",
        "i",
        "d",
        "n",
        "w</w>",
        "r</w>",
        "t</w>",
        "lo",
        "low",
        "er</w>",
        "low</w>",
        "lowest</w>",
        "newer</w>",
        "wider</w>",
        ",</w>",
        "<unk>",
    ]
    vocab_tokens = dict(zip(vocab, range(len(vocab))))
    merges = ["l o 123", "lo w 1456", "e r</w> 1789", ""]
    self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
    self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
    with open(self.vocab_file, "w") as fp:
        fp.write(json.dumps(vocab_tokens))
    with open(self.merges_file, "w") as fp:
        fp.write("\n".join(merges))