new_contents: #!/usr/bin/env python
  
  from __future__ import absolute_import
  from __future__ import print_function
  
  import os
  import sys
  
  our_dir = os.path.dirname(os.path.abspath(__file__))
  # For dev setups, we can find the API in the repo itself.
  if os.path.exists(os.path.join(our_dir, '..')):
      sys.path.insert(0, '..')
  from bots_test_lib import BotTestCase
  
  class TestThesaurusBot(BotTestCase):
      bot_name = "thesaurus"
  
      def test_bot(self):
          self.assert_bot_output(
              {'content': "synonym good", 'type': "private", 'sender_email': "foo"},
              "great, satisfying, exceptional, positive, acceptable"
          )
          self.assert_bot_output(
              {'content': "synonym nice", 'type': "stream", 'display_recipient': "foo", 'subject': "foo"},
              "cordial, kind, good, okay, fair"
          )
          self.assert_bot_output(
              {'content': "synonym foo", 'type': "stream", 'display_recipient': "foo", 'subject': "foo"},
              "bar, thud, X, baz, corge"
          )
          self.assert_bot_output(
              {'content': "antonym dirty", 'type': "stream", 'display_recipient': "foo", 'subject': "foo"},
              "ordered, sterile, spotless, moral, clean"
          )
          self.assert_bot_output(
              {'content': "antonym bar", 'type': "stream", 'display_recipient': "foo", 'subject': "foo"},
              "loss, whole, advantage, aid, failure"
          )
          self.assert_bot_output(
              {'content': "", 'type': "stream", 'display_recipient': "foo", 'subject': "foo"},
              ("To use this bot, start messages with either "
               "@mention-bot synonym (to get the synonyms of a given word) "
               "or @mention-bot antonym (to get the antonyms of a given word). "
               "Phrases are not accepted so only use single words "
               "to search. For example you could search '@mention-bot synonym hello' "
               "or '@mention-bot antonym goodbye'."),
          )
  
subject: Add tests for thesaurus bot in contrib_bots.