Random Ghost-Admin Travis failures

[kevinansfield]

Issue Summary

The switch to using vertical-collection in the Tags screen has resulted in a lot more random failures in Travis than usual. Many times the tests will fail with the following error:

not ok 1039 Firefox 54.0 - Acceptance: Settings - Tags when logged in loads tag via slug when accessed directly
    ---
        message: >
            tag list count after direct load: expected 0 to equal 2
        stack: >
            AssertionError@http://localhost:7357/assets/test-support-6dc08e045d81c5f7acd87d484acadd55.js:21502:18
            [3]</module.exports/Assertion.prototype.assert@http://localhost:7357/assets/test-support-6dc08e045d81c5f7acd87d484acadd55.js:16155:13
            assertEqual@http://localhost:7357/assets/test-support-6dc08e045d81c5f7acd87d484acadd55.js:16725:7
            [10]</module.exports/ctx[name]@http://localhost:7357/assets/test-support-6dc08e045d81c5f7acd87d484acadd55.js:20141:18
            _callee4$@http://localhost:7357/assets/tests-0953d936855fea30820dd1605a3ebf8f.js:4820:34
            tryCatch@http://localhost:7357/assets/vendor-8c5651d938520676ebf73bd9d810a8d6.js:12140:37
            invoke@http://localhost:7357/assets/vendor-8c5651d938520676ebf73bd9d810a8d6.js:12431:22
            defineIteratorMethods/</prototype[method]@http://localhost:7357/assets/vendor-8c5651d938520676ebf73bd9d810a8d6.js:12192:16
            step@http://localhost:7357/assets/tests-0953d936855fea30820dd1605a3ebf8f.js:4519:36
            step/<@http://localhost:7357/assets/tests-0953d936855fea30820dd1605a3ebf8f.js:4530:29
            run@http://localhost:7357/assets/vendor-8c5651d938520676ebf73bd9d810a8d6.js:9900:22
            notify/<@http://localhost:7357/assets/vendor-8c5651d938520676ebf73bd9d810a8d6.js:9913:28
            flush@http://localhost:7357/assets/vendor-8c5651d938520676ebf73bd9d810a8d6.js:7198:9

I've seen this occur in both Chrome and Firefox and it happens much less frequently when testing locally (if you can get it to appear at all there).

[kirrg001]

From #9301:

Ghost-Admin tests on Travis have started failing very often and it's becoming increasingly frustrating trying to get the build to pass due to failures unrelated to the build's changes. This issue is for collecting a list of the tests that randomly fail so that we can dig into why they fail and find ways to increase their reliability.

```
not ok 1593 Firefox 57.0 - Integration: Component: gh-psm-tags-input exposes all tags as options
---
    message: >
        expected 0 to equal 4
```

[kevinansfield]

Another one that pops up pretty frequently:

not ok 1087 Firefox 57.0 - Acceptance: Editor when logged in renders the editor correctly, PSM Publish Date and Save Button
    ---
        message: >
            notification countdown: expected '' to include 'Post will be published in'

[kevinansfield]

A new one, haven't seen this before but logging as it definitely shouldn't have failed:

not ok 1598 Firefox 57.0 - Integration: Component: gh-psm-tags-input updateTags modifies post.tags
    ---
        message: >
            You called "selectChoose('.ember-power-select-trigger', 'Tag One')" but "Tag One" didn't match any option

[kevinansfield]

It's possible that these issues (or at least the power-select based tags input ones) have something to do with the browser environment. I can only get the tests to pass locally if the tests tab has focus, if the tests run whilst a different tab has focus then the same test failures are seen as reported above.

[kevinansfield]

Closing in favour of a new issue with more relevant details as the tests and ember versions have now changed.