For tutorial: Testing JavaScript Code with Timeouts and Promises

fetchMessage.js

export const fetchMessage = () => {
  const messages = ["Message 1", "Message 2", "Message 3"]
  const randomIndex = Math.floor(Math.random() * messages.length);

  return new Promise(resolve => {
    setTimeout(() => { 
      resolve(messages[randomIndex])
    }, 2000)  
  })
}

handleFetchedMessage.js

import { fetchMessage } from "./fetchMessage.js" 

export const handleFetchedMessage = (callback) => {
  setTimeout(async () => {
    const fetchedMessage = await fetchMessage()
    callback(fetchedMessage)
  }, 1000000)
}