imports: import unittest
  from transformers.models.whisper import WhisperTokenizer
  from transformers.testing_utils import slow
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 6 for calling the SpeechToTextTokenizerMultilinguialTest obj's underlying member method code with example usage: obj.test_batch_encoding() without return types