code: def test_tokenize_handles_unicode_letters(self):
      sentence = "HAL9000   and    Ångström"
      expected_tokens = [
          Token("HAL", 0),
          Token("9000", 3),
          Token("and", 10),
          Token("Ångström", 17),
      ]
      tokens = self.word_tokenizer.tokenize(sentence)
      assert [t.text for t in tokens] == [
          t.text for t in expected_tokens
      ]
      assert [t.idx for t in tokens] == [t.idx for t in expected_tokens]
  
file_path: allennlp/tests/data/tokenizers/letters_digits_tokenizer_test.py
imports: from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.tokenizers import Token, LettersDigitsTokenizer
label_desc: Use image node_id 3 for calling the TestLettersDigitsTokenizer obj's underlying member method code with example usage: obj.test_tokenize_handles_unicode_letters() without return types