inject is defined in angular-mocks file, and is intended for unit tests only. If you're using Karma just add it to the files array.
e2e tests are on top of the browser, and run by angular-scenario. you can't inject any Angular components there.
BTW the Angular team are in the process of migrating their functional testing to protractor which is based on Selenium. I'd catch up with that instead of the angular-scenario testing framework. Protractor is a lot better.