Jasmine 2 plug in to re-enable waitsFor and runs functionality

waitsForAndRuns.js

// This is the equivalent of the old waitsFor/runs syntax
// which was removed from Jasmine 2
waitsForAndRuns = function(escapeFunction, runFunction, escapeTime) {
  // check the escapeFunction every millisecond so as soon as it is met we can escape the function
  var interval = setInterval(function() {
    if (escapeFunction()) {
      clearMe();
      runFunction();
    }
  }, 1);

  // in case we never reach the escapeFunction, we will time out
  // at the escapeTime
  var timeOut = setTimeout(function() {
    clearMe();
    runFunction();
  }, escapeTime);

  // clear the interval and the timeout
  function clearMe(){
    clearInterval(interval);
    clearTimeout(timeOut);
  }
};

Thanks for this. This got me started and I reworked it to my liking. Here's another variation if anyone is interested:

/**
 * Polls an escape function. Once the escape function returns true, executes a run function.
 * @param {Function} escapeFunction A function that will be repeatedly executed and should return
 * true when the run function should be called.
 * @param {number} checkDelay Number of milliseconds to wait before checking the escape function
 * again.
 * @returns {{then: Function}} The run function should be registered via the then method.
 */
window.waitUntil = function(escapeFunction, checkDelay) {
  var _runFunction;

  var interval = setInterval(function() {
    if (escapeFunction()) {
      clearInterval(interval);

      if (_runFunction) {
        _runFunction();
      }
    }
  }, checkDelay || 1);

  return {
    then: function(runFunction) {
      _runFunction = runFunction;
    }
  };
};

Usage:

waitUntil(function() { return true }).then(function() { // do my thing });

I published a module doing this. Quickly hacked together, but it works 😄
http://npm.im/wait-until-promise

This is really useful for testing a Promise library.

@SimenB, @RoyTinker
i'm getting this error 'expect' was used when there was no current spec, this could be because an asynchronous test timed out

it('validate target view data for application option auto gaps', () => {
	// component mount
        const Component = mount(
            h(Provider, { store }, [
                h(IntlProvider, { locale: 'en' },
                    h(RDSMContainer),
                )],
           ));
     Component.find('.dropdown-choice').first().simulate('click');
     waitUntil(function () {
            // update the component
            Component.update();
            return Component.find('.targetView').length > 0
        }).then((result) => {
            const TargetComponent = RDSMComponent.find(TargetView);
            expect(TargetComponent.instance().state.applications.length > 0).toBe(true);
      },3000);
});