code: def test_to_params(self):
      tokenizer = CharacterTokenizer(
          byte_encoding="utf-8", start_tokens=[259], end_tokens=[260]
      )
      params = tokenizer.to_params()
      assert isinstance(params, Params)
      assert params.params == {
          "type": "character",
          "byte_encoding": "utf-8",
          "end_tokens": [260],
          "start_tokens": [259],
          "lowercase_characters": False,
      }
  
file_path: allennlp/tests/data/tokenizers/character_tokenizer_test.py
imports: from allennlp.common import Params
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.tokenizers import CharacterTokenizer
label_desc: Use image node_id 4 for calling the TestCharacterTokenizer obj's underlying member method code with example usage: obj.test_to_params() without return types