Mock promise supported interface to produce delayed values

mock-promise-interface.js

function fPromise(timeout, result, error) {
  return new Promise(function(fulfill, reject) {
    setTimeout(function () {
      if (!error) fulfill(result);
      else if (error instanceof Error) throw error;
      else reject(error);
    }, timeout);
  });
}

/*
How to use:
  - Fulfilled promise: fPromise(1000, 'ok-result');
  - Rejected promise: fPromise(1000, null, 'error-result');
  - Throwing promise: fPromise(1000, null, new Error('message'));
*/

doing a throw in other event loop cycle, will never get caught by promises. (Unless you are using zone.js or nodejs domains)

This should work

function doSomething() {
  return new Promise(...);
}


doSomething
  .then(function() {
    throw new Error('will be caught');
  })
  .catch(function(err) {
     console.log(err.message);
  });

Yep. Notice the gist try to simulate an async implementation throwing an Error, not a handler throwing an error. Nothing more.