Function trigger

packages/core/test/acceptance/defer_spec.ts:231–235

(loadingResourcesTime: number)

  fixture.detectChanges();

  const trigger = (loadingResourcesTime: number) => () => {
    loadingTimeout = loadingResourcesTime;
    fixture.componentInstance.trigger = true;
    fixture.detectChanges();
  };

  const triggerPrefetch = (loadingResourcesTime: number) => () => {
    loadingTimeout = loadingResourcesTime;