Injectable Mixins

class MyInjectable() {
  val myString = "my String"
}

trait MyTrait {
  @Inject
  val myInjectable: MyInjectable = null // Initialize to null so that it isn't abstract and will be injected by guice. Is there a better way to do this though?
}

class MyObject extends Controller with MyTrait {}

@RunWith(classOf[JUnitRunner])
class MixinInjectionSpec extends Specification {
  "Guice" should { 
    "inject the mixin trait" in {
      val injector = Guice.createInjector()
      val myObject = injector.getInstance(classOf[MyObject])
      myObject.myInjectable.myString must equalTo("my String")
    }
  }
}