You get almost everything that you get from protractor and more with Ember. There’s some debate around that suggests you should drive your application from the outside using something Seleniumesque. My personal experience with both Selenium and the Protractor combination is one of painfully slow tests. I’ve use Rails with Capybara, Angular with Grunt + Protractor, etc, and they are all hideously slow.
One of the things I LOVE the most about Ember is the tight and super well thought out testing strategies. Having a test suite that runs thousands of both unit and integration tests in seconds is amazing.
If you want to see this kind of thing in action, I highly recommend cloning the Discourse project and running their test suite (it’s the things that this site is actually build on). I think that would give you the kind of confidence that there’s enough there for you to not miss Protractor and Selenium, in fact, you’ll probably be cursing yourself for not finding this out sooner