Angular 2:MockBackend 返回“未定义"响应 [英] Angular 2 : MockBackend returning 'undefined' response
问题描述
我正在尝试使用 MockBackend 为我的服务编写单元测试,每次我收到未定义的响应时.任何帮助,将不胜感激.我已经检查了下面的所有这些解决方案,与我的相比,我真的没有看到太大的差异.
I am trying to write up a unit test for my service using MockBackend and each time I get a response as undefined. Any help would be appreciated. I have checked all these solutions below and compared to mine I really don't see much differences.
这是我的服务:
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import { SomeObject } from './someObject';
@Injectable()
export class SomeService {
private serviceUrl: string = 'http://localhost:8080/getObjects';
constructor( private http: Http ) { }
getObjects() {
return this.http.get( this.serviceUrl )
.map(( response ) => response.json().content as SomeObject[])
}
}
这是我的测试:
import { Http, BaseRequestOptions, Response, ResponseOptions } from '@angular/http';
import { TestBed, tick, fakeAsync, inject } from '@angular/core/testing';
import { MockBackend } from '@angular/http/testing';
import { SomeService } from './some.service';
import { SomeObject } from './someObject';
describe( 'SomeServiceTest', () => {
let stubData: SomeObject[] = [
new SomeObject( 1, "Title" )
];
beforeEach(() => {
TestBed.configureTestingModule( {
providers: [
SomeService,
MockBackend,
BaseRequestOptions,
{
provide: Http,
useFactory: ( backend: MockBackend, options: BaseRequestOptions ) => {
return new Http( backend, options );
},
deps: [MockBackend, BaseRequestOptions]
}
]
});
});
it( 'should fetch data', inject( [SomeService, MockBackend], fakeAsync(( service: SomeService, mockBackend: MockBackend ) => {
let res: SomeObject[];
mockBackend.connections.subscribe( c => {
expect( c.request.url ).toBe( 'http://localhost:8080/getObjects' );
c.mockRespond( new Response( new ResponseOptions( {
body: JSON.stringify( stubData )
}) ) );
});
service.getObjects().subscribe(( response ) => {
console.log( "response :: " + JSON.stringify( response ) ); // this is where I am seeing undefined
res = response;
});
tick();
expect( res[0].name ).toBe( 'Title' ); // this returns an exception TypeError: Cannot read property '0' of undefined
}) ) );
});
推荐答案
我可能错了,但我相信您的问题是,首先,您将 response.json().content 作为 Object[]
来自您的服务.content
属性很可能是未定义的.我建议只将您的响应映射到 json 对象并让您的组件处理它.
I might be wrong, but I believe your issue is, first, that you are returning response.json().content as Object[]
from your from your service.the content
property is most likely undefined. I would suggest just mapping your response to a json object and having your component handle it.
getObjects() {
return this.http.get( this.dealsUrl )
.map(( response ) => response.json());
}
然后
service.getSomeObjectsUsingObservable().subscribe(( response ) => {
console.log( "response :: " + JSON.stringify( response ) );
if (response.content){
res = response as SomeObject[];
}
else {
//- fail test
}
});
tick();
expect( res[0].name ).toBe( 'Title' );
希望能帮到你
这篇关于Angular 2:MockBackend 返回“未定义"响应的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!