Async/await in model hooks fail in tests

Given a model hook that uses async/await and calls Ember.set after an await statement, this will fail in an acceptance test visiting that route, with an You have turned on testing mode, which disabled the run-loop's autorun. You will need to wrap any code with asynchronous side-effects in a run error. This does not happen when rewriting this using Promises.

If I understand this correctly, the root issue seems to be that native Promises do not integrate into the Ember run loop, while RSVP.Promise do, and is the same as reported in #15240 and https://github.com/emberjs/rfcs/issues/175. But I thought creating this issue here would help others getting bitten by this to find this.

As reported elsewhere, a workaround is possible by

• replacing the native Promise in tests with the RSVP one: window.Promise = Ember.RSVP.Promise;. (you can add that e.g. to tests/index.html)
• making sure your targets.js is configured to make Babel transpile async/await. Using native async/await in e.g. Chrome does always lead to those failing tests.

[pixelhandler]

@simonihmig @jrjohnson @caseywatts @offirgolan @alvincrespo Perhaps this post sheds some light on the considerations for running with async/await …

http://rwjblue.com/2017/10/30/async-await-configuration-adventure/

[rwjblue]

Hoping to kickstart more efforts to enable this, but we should probably track the actual issue over on https://github.com/emberjs/rfcs/issues/175 (which I think predates this issue a bit). I’ll try to chime in over there with a quick status update and lay out the game plan that @krisselden is coaching me on…