class_docstr: tests Vocabulary Class
class_docstr_tok: ["tests","Vocabulary","Class"]
code: def test_lookup_int(self):
      with self.assertRaises(TypeError):
          self.vocab.lookup(1)
      with self.assertRaises(TypeError):
          list(self.vocab.lookup([1, 2]))
  
imports: import unittest
  from collections import Counter
  from timeit import timeit
  from nltk.lm import Vocabulary
label_desc: Use image node_id 16 for calling the NgramModelVocabularyTests obj's underlying member method code with example usage: obj.test_lookup_int() without return types