Cannot read property 'reopen' of undefined

[lolmaus]

Ran into this today:

"after each" hook for "Scenario: Applying a coupon with a free product"‣
TypeError: Cannot read property 'reopen' of undefined
    at Class.dropObject (<anonymous>:2978:18)
    at Class.willDestroy (<anonymous>:2951:18)
    at Class.superWrapper (assets/vendor.js:31574:22)
    at invoke (assets/vendor.js:54425:16)
    at Queue.flush (assets/vendor.js:54317:13)
    at DeferredActionQueues.flush (assets/vendor.js:54521:21)
    at Backburner._end (assets/vendor.js:55097:34)
    at Backburner.end (assets/vendor.js:54783:12)
    at Backburner._run (assets/vendor.js:55152:16)
    at Backburner.run (assets/vendor.js:54832:19)

Took me quite a while to figure out that the issue is caused by Ember Inspector. How freaky is that the Inspector breaks your tests! 😱

Found a report of this issue from four 😱😱 years ago: emberjs/ember.js#11863 (comment) @stefanpenner's reply is very interesting, though irrelevant to the cause of this particular problem.

Inspector crashes here:

ember-inspector/ember_debug/object-inspector.js

Lines 328 to 334 in f1ab36a

	dropObject(objectId) {
	let object = this.sentObjects[objectId];
	if (object.reopen) {
	object.reopen({ willDestroy: object._oldWillDestroy });
	delete object._oldWillDestroy;
	}

Simply closing and reopening the inspector resulted in the issue not happening again, so I'm unable to share a reproduction.

But the fix is obvious, natural and free from side effects. I'll make a PR.