[英]angular2 unit test of nested services
我正在尝试为服务编写一些单元测试:
export class Service1 {
...
public constructor(service2: Service2, service3: Service3) {}
...
}
其中Service2包含Service3:
export class Service2 {
...
public constructor(service3: Service3, stringa: string) {}
...
}
我以一种非常糟糕的方式开始测试,例如:
it("check XXX", () => {
let service3: Service3= new Service3();
let service2: service2= new service2(service3, "stringa");
let service1: Service1 = new Service1(service2, service3);
expect(X).toEqual(X);
});
但是现在,我正在使用beforeEachProviders,这会发生什么:
beforeEachProviders(() => {
return [
provide(Service2, { useclass: MockService2}),
provide(Service3, { useclass: MockService3}),
provide('stringa', { useValue: "stringa"}),
Service1
];
});
it('check XXX ', inject(
[Service2, Service3], (service2: Service2, service3: Service3) => {
expect(true).toEqual(true);
}));
是:
Failed: No provider for String! (Service2-> String).
有人可以帮我吗?
提前致谢。
如果要从依赖项注入中注入字符串值,则需要使用@Inject
装饰器:
export class Service2 {
...
public constructor(service3: Service3, @Inject('stringa') stringa: string) {}
...
}
实际上,如果您不使用@Inject
装饰器,则注入默认情况下依赖于参数类型。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.