angular - 单元测试将 Injector 与 Router(和其他服务)一起使用的父类

Question

假设我有一个类 Foo，它为其所有派生类提供依赖注入(inject)服务，如下所示:

export class Foo {
    protected fb : FormBuilder;
    protected router : Router;
    protected otherService : OtherService;
    protected anotherService : AnotherService;

    constructor(injector : Injector) {
        this.fb = injector.get(FormBuilder);
        this.router = injector.get(Router);
        this.otherService = injector.get(OtherService);
        this.anotherService = injector.get(AnotherService);
}

它具有派生自它的类:

export class Bar extends Foo {

    constructor(injector : Injector){
         super(injector);
    }
}

如何正确地对父类进行单元测试，而不会遇到:

错误:无法解析 Foo 的所有参数:(?)

此刻我已经(尝试了很多，很多不同的东西来让它工作，但失败了:( )

export function main() {

    describe('Class: Foo', () => {
        beforeEach(async(() => {

            TestBed.configureTestingModule({
                providers: [
                    Foo,
                    Injector,
                    OtherService,
                    AnotherService
                ]
            });
        }));


        it('should compile', inject([Foo, Injector], ( foo: Foo, injector : Injector ) => {
            console.log("INJECTOR", injector);
            expect(foo).toBeTruthy();
        }));

    });
}

我也试过这样使用 ReflectiveInjector.resolveAndCreate:

{
    provide : Injector,
    useValue: ReflectiveInjector.resolveAndCreate([FormBuilder, Router, OtherService, AnotherService])
}

但仍然没有骰子 :( 有什么想法吗？

Answer 1

看来你需要在 Foo 构造函数中为 Injector 添加 @Inject 装饰器

constructor(@Inject(Injector) injector: Injector) {

并正确配置TestBed。更准确地说，您必须导入 RouterModule，否则您将遇到 Router 的另一个问题:

TestBed.configureTestingModule({
  imports: [
    RouterModule.forRoot([])
  ],
  providers: [    
    FormBuilder,
    Foo,
    OtherService,
    AnotherService
  ]
});

您可以在 Plunker Example 中尝试实际操作