code: def test_encoding_keys(self):
      tokenizer = self.canine_tokenizer
      src_text = [
          "Once there was a man.",
          "He wrote a test in HuggingFace Tranformers.",
      ]
      batch = tokenizer(src_text, padding=True, return_tensors="pt")
      # check if input_ids, attention_mask and token_type_ids are returned
      self.assertIn("input_ids", batch)
      self.assertIn("attention_mask", batch)
      self.assertIn("token_type_ids", batch)
  
imports: import json
  import os
  import shutil
  import tempfile
  import unittest
  from transformers import BatchEncoding, CanineTokenizer
  from transformers.testing_utils import require_tokenizers, require_torch
  from transformers.tokenization_utils import AddedToken
  from transformers.utils import cached_property
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 5 for calling the CanineTokenizationTest obj's underlying member method code with example usage: obj.test_encoding_keys() without return types