anchor.diff:    /// by setting [watchAngularLifecycle] to `false`.
     factory NgTestBed({
       Element host,
  +    InjectorFactory rootInjector,
       bool watchAngularLifecycle: true,
     }) {
       if (T == dynamic) {
  
positive.code:     }
      return new NgTestBed<T>._allowDynamicType(
        host: host,
        watchAngularLifecycle: watchAngularLifecycle,
      );
    }
  
negative.code: /// 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,
    );
  }
  