Speed up feedback-tab tests

[epeach]

Combining scenarios in the feedback_tab.feature to minimize the number of times the expensive background is run.

Old Test Run: ~14 minutes
New Test Run: ~7 minutes

[Hamms]

🎉 50% speedup! 🎉

[joshlory]

Is there a way to make the expensive setup steps faster?

[epeach]

That's a good question! We're definitely limited by the fact that the background for these tests is a bit complicated (student has to be in a teacher section and submit 'work'). But the background is common for all the tests, so we do lose time in re-running the shared background. For test organization, I'm hesitant to combine the scenarios any further then they already are, although if this test continues to bloat run-time, that is a possibility. I spent some time trying to get a shared background to run once before all tests, but figured I'd get a fast band-aid fix out on this as soon as possible. I'm hoping to continue to look into how to run the background just once. And eventually, when this is out of development, one of these scenarios will be removed, resulting in additional speed up.