[英]Karma/Jasmine test cases for Angular2 service
api-connector.service.ts import { Injectable } from '@angular/core'; import { HttpClient, HttpParams } from '@angular/common/http'; import { ErrorObservable } from 'rxjs/observable/ErrorObservable'; import { Observable } from 'rxjs/Observable'; import {environment} from '../../../environments/environment'; import { catchError } from 'rxjs/operators/catchError'; @Injectable() export class ApiConnectorService { constructor(private http: HttpClient) { } private getQueryString(params): string { const queryString = Object.keys(params).map(key => key + '=' + params[key]).join('&'); console.log('QUERY STRING', queryString); return ('?' + queryString); } private formatErrors(error: any) { return new ErrorObservable(error.error); } get(path: string, payload: Object = {}): Observable<any> { return this.http.get(`${environment.base_url}${path}` + this.getQueryString(payload)) .pipe(catchError(this.formatErrors)); } put(path: string, body: Object = {}): Observable<any> { return this.http.put( `${environment.base_url}${path}`, body ).pipe(catchError(this.formatErrors)); } post(path: string, body: Object): Observable<any> { // console.log('API SERVICE BODY', body) return this.http.post( `${environment.base_url}${path}`, body ).pipe(catchError(this.formatErrors)); } delete(path): Observable<any> { return this.http.delete( `${environment.base_url}${path}` ).pipe(catchError(this.formatErrors)); } }
login.contract.ts export interface LoginRequest { env?: string; userid: string; password: string; newpassword: string; } export interface LoginResponse { token: string; }
我对Angular以及Karma / Jasmine都还很陌生。
我创建了一个简单的登录组件和登录服务。 为此目的编写测试用例时,我遵循了一些文档和angular.io网站。 我已经在文档的帮助下为登录组件编写了一些测试用例,但是我没有设法为登录服务编写测试用例。
如何为登录服务编写测试用例?
这是我的login.service.ts文件
import { Injectable } from '@angular/core';
import { ApiConnectorService } from '../api-handlers/api-connector.service';
import { LoginRequest, LoginResponse } from './login.contract';
import { Observable } from 'rxjs/Observable';
import { map } from 'rxjs/operators';
@Injectable()
export class LoginService {
constructor(private apiConnector: ApiConnectorService) { }
login(payload: LoginRequest): Observable<LoginResponse> {
console.log('Login payload ', payload);
return this.apiConnector.post('/api/login', payload)
.pipe(
map((data: LoginResponse) => data)
)
}
}
考虑了一下,这就是我将如何测试您的服务的方法。 我无法提供上次测试的确切详细信息,因为我没有您的ApiConnectorService或LoginResponse对象的详细信息,但是我敢肯定您会明白的。
import { TestBed, inject } from '@angular/core/testing';
import { LoginService } from './login.service';
import { LoginResponse, LoginRequest } from './login.contract';
import { Observable, of } from 'rxjs';
import { ApiConnectorService } from './api-connector.service';
class ApiConnectorServiceStub {
constructor() { }
post(address: string, payload: LoginRequest): Observable<LoginResponse> {
return of(new LoginResponse());
}
}
describe('LoginService', () => {
beforeEach(() => {
TestBed.configureTestingModule({
providers: [LoginService,
{provide: ApiConnectorService, useClass: ApiConnectorServiceStub }]
});
});
it('should be created', inject([LoginService], (service: LoginService) => {
expect(service).toBeTruthy();
}));
it('should call post on apiConnectorService with right parameters when login is called',
inject([LoginService], (service: LoginService) => {
const apiConnectorStub = TestBed.get(ApiConnectorService);
const spy = spyOn(apiConnectorStub, 'post').and.returnValue(of(new LoginResponse()));
const loginRequest = of(new LoginRequest());
service.login(loginRequest);
expect(spy).toHaveBeenCalledWith('/api/login', loginRequest);
}));
it('should map data correctly when login is called', inject([LoginService], (service: LoginService) => {
const apiConnectorStub = TestBed.get(ApiConnectorService);
// Set you apiConnector output data here
const apiData = of('Test Data');
const spy = spyOn(apiConnectorStub, 'post').and.returnValue(apiData);
const result = service.login(of(new LoginRequest()));
// Set your expected LoginResponse here.
const expextedResult = of(new LoginResponse());
expect(result).toEqual(expextedResult);
}));
});
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