E2e testing

[dmitrytrager]

Currently we have both feature tests and system tests for e2e testing.
It would be great to use single approach. Let's move system tests info feature folder and have them separated by controller.
Also, we can replace view tests with e2e tests

• Merge system tests and feature tests
• Substitute view tests with e2e tests

[Niraj22]

I'd like to work on this — could you please assign it to me?