Broken tests in v0.7.0-beta.8

[Turbo87]

It looks like v0.7.0-beta.8 (with #229) broke some of our existing old API tests.

Most failures seem to look like this:

        actual: >
            Element .edit-order-email-dialog does not exist
        expected: >
            Element .edit-order-email-dialog exists

[rwjblue]

What kind of test (moduleForComponent, etc)? Are all failing or just some? If you inspect the DOM at the time of the failed assertion does it contain the correct things (but just in a nested element or something)?

[Turbo87]

This was apparently caused by qunit-dom caching the reference to the #ember-testing element, but #229 changed the behavior to recreate a new element for each test. This issue was resolved in mainmatter/qunit-dom#33 and released as qunit-dom@0.3.3.