So today I encountered a little bug while upgrading Angular 2 from RC4 to RC5. When I ran my unit tests in Chrome, everything was working fine. However, with the Chutzpah Visual Studio Extension I kept receiving Error: Can't resolve all parameters for HeroService: (?) when running tests, even though the configuration seemed fine.
Turns out it was PhantomJS not being fully compatible to ECMAScript 6, so I needed to include es6-shim in my npm package.json file and add it as the first reference in chutzpah.json.
I hope I can save you a bit of searching for the cause with this post. Happy testing!