DEV: prevents test timeout (PR #12631)

clock manipulation seems not reliable in component tests. This blog post does a great job of explaining it: Bending Time in Ember Tests - DockYard

Sadly, we don’t have all the “recent” ember test helpers and can’t use things like getSettledState().

For now this pattern seems the most reliable and easy to apply, albeit not great.

Note if you wist to reproduce the current timeout, the following command should do it: QUNIT_SEED=215263717493121190480103670124734840282 rake qunit:test


I think isHidden can be removed completely by changing attributeBindings to ["showPrompt::aria-hidden"]