问没有提供$injector- In AngularJs + Angular 8混合应用单元测试用例

EN

    {provide: '$rootScope',useValue : {}}

This provider will be part of TestBed configuration like this :

    beforeEach(async(() => {
        TestBed.configureTestingModule({
          declarations: [],
          imports: [],
          providers : [{provide: '$rootScope',useValue : {}}]
        })
          .compileComponents();
      }));