Bring over DOM helper implementation. #258

Implementation from https://github.com/cibernox/ember-native-dom-helpers/blob/v0.5.8/addon-test-support/wait-until.js.

Original implementations are from https://github.com/cibernox/ember-native-dom-helpers and then modified: * Prefer default exports when reasonable * Remove manual run-wrapping when firing events (event listeners should already be run-wrapped). * Allow `focusin` to bubble in `focus` * Remove `context` arguments from helper methods.

Original implementations are from https://github.com/cibernox/ember-native-dom-helpers and then modified: * Added `fireEvent(element, 'focusout')` * Remove run wrapping

Original implementations are from https://github.com/cibernox/ember-native-dom-helpers and then modified: * Remove run wrapping

Extract `_focus` helper method that can be used from `click` to avoid the assertion...

Even though https://w3c.github.io/uievents/#events-focusevent-event-order suggests that `focus` is always fired after `focusin`, after testing on Firefox, Chrome, and Safari (snippet below) this is not true. ```js let element = document.createElement('input'); ['mousedown', 'mouseup', 'click', 'focus', 'focusin'].forEach(type => { element.addEventListener(type, () => { console.log('event:', type); }); }); document.body.appendChild(element); ```

Never fire events synchronously.

In order to ensure "time traveling" (sinon's fake timers, timecop, etc) we need to capture our `setTimeout` early during evaluation.

Brings in the changes from qunitjs/qunit@6a7910a.

* ensure always async * fire correct events (in order) To ensure correct event order, used the following snippet: ```js let element = document.createElement('input'); ['blur', 'focusout'].forEach(type => { element.addEventListener(type, () => { console.log('event:', type); }); }); document.body.appendChild(element); ```

Prior to this change the `nextTick` would run and _might_ not be properly waited on by the returned `settle()` promise (though in practice `nextTick` did finish first). This updates to ensure that we only return `settled()` after the actual events have been fired.

Intial implementation from https://github.com/cibernox/ember-native-dom-helpers, but modified in a few ways: * Ensure validations are ran sync * Ensure events are triggered async * Remove run loop wrapping * Tweak error message and validation.

Also add extra underscores :P

* Use `target` to mean `selectorOrElement` * Properly indicate optional params * Show default values

Avoid `setContext(this)` (use `setContext(localVariable)`) to make it much clearer what is going on.

These tests previously used a sync version of click that allowed `settled` to be tested with _only_ waiting for some portions of settledness. When the tests were converted to use the new public version of `click` the test began failing (because `click` doesn't kick off until the next tick of the event loop, so `settled` resolves immediately).

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Bring over DOM helper implementation. #258

Bring over DOM helper implementation. #258

Commits on Dec 15, 2017