anchor.diff:  /// This is for compatibility reasons only and should not be used otherwise.
   NgTestBed<T> createDynamicTestBed<T>({
     Element host,
  +  InjectorFactory rootInjector,
     bool watchAngularLifecycle: true,
   }) {
     return new NgTestBed<T>._allowDynamicType(
       host: host,
  +    rootInjector: rootInjector,
       watchAngularLifecycle: watchAngularLifecycle,
     );
   }
  
positive.code:   /// by setting [watchAngularLifecycle] to `false`.
    factory NgTestBed({
      Element host,
      bool watchAngularLifecycle: true,
    }) {
      if (T == dynamic) {
  
negative.code:     }
      return new NgTestBed<T>._allowDynamicType(
        host: host,
        rootInjector: rootInjector,
        watchAngularLifecycle: watchAngularLifecycle,
      );
    }
  