Model Fragments is failing CI

[runspired]

It passes for us because when the smoke-test and the test against commit both fail we don't consider it a regresssion. Based on the CI stack traces it appears the failures may be due to changes in Ember's object model. We should investigate soon.

cc @pzuraq

[runspired]

looks like they already investigated and is not object model related: adopted-ember-addons/ember-data-model-fragments#338

The confusing bit is that the smoke-test should run against ember-data 3.5: https://github.com/lytics/ember-data-model-fragments/blob/master/package.json#L50

So I investigated and it appears it does fail, but gets marked as passing: https://github.com/emberjs/data/pull/6784/checks?check_run_id=313187376

Then I remembered we'd set it up as allowed-fail :( https://travis-ci.org/emberjs/data/jobs/614897070?utm_medium=notification&utm_source=github_status

[runspired]

We should improve our monitoring of allowed-fail scenarios so that we're always clear on when one is failing and can move it back if it begins passing.

[runspired]

closing in favor of #7529