我一直在嘗試使用Jasmine爲Angular 2項目創建集成測試。我可以嘲笑服務和數據,並運行適當的單元測試,但現在我想測試以確保我的組件可以使用該服務實際連接到後端API。到目前爲止,我可以確認我的組件和服務中的方法是由我的間諜引發的,但是在組件內的.subscribe(....)方法直到測試完成/失敗之後纔會完成。我對我的規格代碼如下:Angular 2使用可觀測的組件測試組件而不嘲笑
import { async, ComponentFixture, TestBed, inject, fakeAsync } from '@angular/core/testing';
import { DebugElement } from "@angular/core";
import { By } from "@angular/platform-browser";
import { ReviewComponent } from './review.component';
import { FormsModule } from '@angular/forms';
import { UrlService } from 'app/shared/services/url.service';
import { HttpModule, Http } from '@angular/http';
import { ReviewService } from "./review.service";
describe('CommunicationLogComponent',() => {
let component: ReviewComponent;
let fixture: ComponentFixture<ReviewComponent>;
let serviceSpy: jasmine.Spy;
let componentSpy: jasmine.Spy;
let service: ReviewService;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [FormsModule, HttpModule],
providers: [UrlService],
declarations: [ReviewComponent]
})
.compileComponents();
});
beforeEach(() => {
fixture = TestBed.createComponent(ReviewComponent);
component = fixture.componentInstance;
component.processId = 6;
service = fixture.debugElement.injector.get(ReviewService);
componentSpy = spyOn(component, "ngOnInit").and.callThrough();
serviceSpy = spyOn(service, 'getReviewByProcess').and.callThrough();
});
it('should create component',() => {
expect(component).toBeTruthy();
});
it('should not have called ngOnInit() yet',() => {
expect(componentSpy).not.toHaveBeenCalled();
});
it('should make a call to ngOnInit() and by extension getReviewByProcess',() => {
fixture.detectChanges();
expect(componentSpy).toHaveBeenCalled();
expect(serviceSpy).toHaveBeenCalled();
});
//ISSUES HERE
it('should show review after the getReviewByProcess resolves', async(() => {
fixture.detectChanges();
fixture.whenStable().then(() => {
expect(componentSpy).toHaveBeenCalled();
fixture.detectChanges();
expect(component.Reviews[0]).not.toBe(undefined);
});
}), 5000);
});
所有的測試,直到一個標有「//問題對於這個問題」工作正常,並通過。
我正在使用async()並在試圖完成我的測試之前等待燈具變得穩定。它還通過componentSpy確認ngOnInit已被調用(它將連接到後端並訂閱Review)。
我的組件的代碼如下所示:
import { Component, EventEmitter, Input, OnInit } from '@angular/core';
//Service
import { ReviewService } from "app/process/monitoring/shared/components/review/review.service";
//Classes
import { Review } from "app/process/monitoring/shared/components/review/review";
@Component({
providers: [
ReviewService
],
selector: 'monitoring-review',
templateUrl: './review.component.html',
styleUrls: ['./review.component.css']
})
export class ReviewComponent implements OnInit {
public Review: Review = new Review();
public Reviews: Review[] = [];
@Input() public processId: number;
constructor(
private ReviewService: ReviewService
) { }
ngOnInit(): void {
this.ReviewService.getReviewByProcess(this.processId, true).first().subscribe(
Reviews => {
if (Reviews) {
this.Reviews = Reviews //doesn't trigger until test is finished
}
},
error => console.log(error)
);
}
}
最後我ReviewService看起來是這樣的:
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Headers, RequestOptions, RequestMethod, URLSearchParams } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';
// App-wide Services
import { UrlService } from 'app/shared/services/url.service';
// Classes
import { Review } from "app/process/monitoring/shared/components/review/review";
@Injectable()
export class ReviewService {
private devUrl: string;
private jsonHeaders: Headers = new Headers({ 'Content-Type': 'application/json' });
private prodUrl: string;
private reviewPath: string = 'monitoring/program/';
constructor(
private urlService: UrlService,
private http: Http
) {
this.devUrl = this.urlService.getUrl('dev').url;
this.prodUrl = this.urlService.getUrl('prod').url;
}
getReviewByProcess(processId: number, isProd: boolean = false): Observable<Review[]> {
let targetUrl: string = (isProd ? this.prodUrl : this.devUrl) + this.reviewPath + "/" + processId;
return this.http.get(targetUrl, { withCredentials: true })
.map((res: Response) => res.json())
.catch((error: any) => Observable.throw(error.json().error || 'Server error')
);
};
}
使用噶調試器,我可以證實,我測試調用ngOnInit,然後調用該服務,但直到我的測試完成之後,它纔會觸及我的組件訂閱的內部部分(標記爲「//不觸發」)。
總結:我想創建一個測試,可以測試我的組件與我的服務集成,使用「實時」後端來收集我的數據。這是服務,我的組件不會嘲笑任何東西。我可以確認我的方法已經達到,但在ReviewComponent的ngOnInit()方法中找到的.subscribe(...)不會完成,直到測試完成/失敗。
我不想從我的web API返回模擬數據,而是合法的數據。這只是茉莉花不能支持的東西,我應該尋找使用量角器的解決方案? – LandSharks
這是單元測試,它應該被限定範圍並專用於特定的組件/功能,並且您需要模擬環境來對其進行存檔。如果你想模擬http,你可以使用MockBackend來模擬http服務級別。如果您需要給您打電話Web API以進行測試 - 使用Protractor進行端到端測試,但具有角度2單元測試的強大功能,我並不認爲e2e沒有太多需求。 –
茉莉花不支持集成測試嗎?我注意到角度2的主要文檔視域:https://angular.io/docs/ts/latest/guide/testing.html#!#component-with-async-service 他們正在做的確切的事情我想要,但缺少一個http連接。那裏的數據是靜態的。 – LandSharks