input: Write a function to design a basic chatbot in Python for responding to casual inquiries. The chatbot should randomly select a response from a predefined list of answers and continue the conversation until the user inputs 'Goodbye'. If the user inputs 'Goodbye', the chatbot should respond with 'Goodbye!' and end the conversation.
  assert chatbot_response("What's up?") in ["That's a great question!", "I'm not sure, but I'll try to find out!", "That sounds interesting, tell me more!", "I have no idea, sorry!"]
  assert chatbot_response("How's it going?") in ["That's a great question!", "I'm not sure, but I'll try to find out!", "That sounds interesting, tell me more!", "I have no idea, sorry!"]
output: import random
  
  def chatbot_response(user_input):
      responses = ["That's a great question!", "I'm not sure, but I'll try to find out!", "That sounds interesting, tell me more!", "I have no idea, sorry!"]
      if user_input == "Goodbye":
          return "Goodbye!"
      else:
          return random.choice(responses)