docstr: Tests respond() where the agent provides a string response to a single message.
docstr_tok: ["Tests","respond","(",")","where","the","agent","provides","a","string","response","to","a","single","message","."]
code: def test_respond(self):
      """
      Tests respond() where the agent provides a string response to a single message.
      """
      agent = create_agent(dict(model="repeat_query"))
      message = Message(
          {
              "text": "hi!",
              "label": ["A"],
              "episode_done": False,
              "label_candidates": ["A", "B", "C"],
          }
      )
      response = agent.respond(message)
      self.assertEqual(response, "hi!")
      message = Message({"text": "hello!", "episode_done": False})
      response = agent.respond(message, label=["A"])
      self.assertEqual(response, "hello!")
      response = agent.respond(Message(text="no way!"), label=["A"])
      self.assertEqual(response, "no way!")
      response = agent.respond("what's up?", episode_done=True)
      self.assertEqual(response, "what's up?")
      response = agent.respond("hey there!")
      self.assertEqual(response, "hey there!")
      response = agent.respond("")
      self.assertEqual(response, "Nothing to repeat yet.")
      response = agent.respond(
          Message(episode_done=True), text="I feel infinite."
      )
      self.assertEqual(response, "I feel infinite.")
  
file_path: ParlAI/tests/test_repeat_query_agent.py
imports: import unittest
  from parlai.core.agents import create_agent
  from parlai.core.message import Message
label_desc: Use image node_id 1 for calling the TestRepeatQueryAgent obj's underlying member method code with example usage: obj.test_respond() without return types