def METHOD_NAME(self):
    task, model = self.obt_task(["en", "ro", "zh"])
    assert obt._lang_token("en") in task.dictionary
    assert obt._lang_token("ro") in task.dictionary
    assert obt._lang_token("zh") in task.dictionary
    en_bos = obt._lang_token_index(task.common_dict, "en")
    assert "en" == task.common_dict[en_bos].strip("_")
    zh_bos = obt._lang_token_index(task.common_dict, "zh")
    assert "zh" == task.common_dict[zh_bos].strip("_")
    zh_sample = mk_sample([zh_bos, 16, 14, 12, 10])
    # we expect to receive the bos token for translation
    assert task.get_bos_token_from_sample(zh_sample) == en_bos