link to add new car
link to add new car

explanation from
http://hashrocket.com/blog/posts/test-driving-a-stubbed-api-in-ember-with-ember-cli-mirage

"Our test fails because there's no link with an id of add-car. This link
should take us to the cars.new route"

omouse/ember-cli-mirage-tutorial,omouse/ember-cli-mirage-tutorial