Angular w/Jasmine和Karma测试模拟服务
我想使用Jasmine/Karma来测试一个模拟服务,而不知道真正的服务。问题是,它希望我添加来自真实服务的所有依赖项,如HttpErrorHandler和MessageService 这是下面的实际服务代码:Angular w/Jasmine和Karma测试模拟服务,angular,unit-testing,Angular,Unit Testing,我想使用Jasmine/Karma来测试一个模拟服务,而不知道真正的服务。问题是,它希望我添加来自真实服务的所有依赖项,如HttpErrorHandler和MessageService 这是下面的实际服务代码: import { Injectable } from '@angular/core'; import { HttpClient } from '@angular/common/http'; import { catchError } from 'rxjs/operators'; impo
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { catchError } from 'rxjs/operators';
import { httpOptions } from '../http-options';
import { HttpErrorHandler, HandleError } from '../http-error-handler.service';
//
@Injectable({ providedIn: 'root' })
export class AboutService {
private handleError: HandleError;
constructor(
private http: HttpClient,
httpErrorHandler: HttpErrorHandler
) {
this.handleError = httpErrorHandler.createHandleError('AboutService');
}
// Skills
////////
getSkills() {
const url = 'path';
return this.http.get<any>(url, httpOptions)
.pipe(
catchError(this.handleError('getSkills', []))
);
}
}
从'@angular/core'导入{Injectable};
从'@angular/common/http'导入{HttpClient};
从“rxjs/operators”导入{catchError};
从“../http选项”导入{httpOptions};
从“../http error handler.service”导入{HttpErrorHandler,HandleError};
//
@可注射({providedIn:'root'})
导出类AboutService{
私有handleError:handleError;
建造师(
私有http:HttpClient,
httpErrorHandler:httpErrorHandler
) {
this.handleError=httpErrorHandler.createHandleError('AboutService');
}
//技巧
////////
getSkills(){
常量url='路径';
返回此.http.get(url,httpOptions)
.烟斗(
catchError(this.handleError('getSkills',[]))
);
}
}
还有我。规范文件
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { AboutComponent } from './about.component';
//
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';// Other imports
import { AboutService } from './about.service';
// import { HttpErrorHandler } from '../http-error-handler.service';
// import { MessageService } from '../message.service';
// import { MaterialModule } from "../material/material.module";
class MocksService extends AboutService{
// getSkills() {
// return [someRandomArray];
// }
}
describe('AboutComponent', () => {
let component: AboutComponent;
let fixture: ComponentFixture<AboutComponent>;
//
let httpTestingController: HttpTestingController;
let service: AboutService;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ AboutComponent ],
imports: [ HttpClientTestingModule, MaterialModule ],
providers: [
{ AboutService, useClass: MocksService },
// HttpErrorHandler,
// MessageService
]
})
.compileComponents();
//
httpTestingController = TestBed.get(HttpTestingController);
service = TestBed.get(AboutService);
}));
beforeEach(() => {
fixture = TestBed.createComponent(AboutComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
it('should be created', () => {
const service: AboutService = TestBed.get(AboutService);
expect(service).toBeTruthy();
});
});
从'@angular/core/testing'导入{async,ComponentFixture,TestBed};
从“./about.component”导入{AboutComponent};
//
从“@angular/common/http/testing”;/”导入{HttpClientTestingModule,HttpTestingController}其他进口
从“./about.service”导入{AboutService};
//从“../http error handler.service”导入{HttpErrorHandler};
//从“../message.service”导入{MessageService};
//从“./material/material.module”导入{MaterialModule};
类MocksService扩展了AboutService{
//getSkills(){
//返回[someRandomArray];
// }
}
描述('AboutComponent',()=>{
let组件:关于组件;
let夹具:组件夹具;
//
设httpTestingController:httpTestingController;
让服务:关于服务;
beforeach(异步(()=>{
TestBed.configureTestingModule({
声明:[关于组件],
导入:[HttpClientTestingModule,MaterialModule],
提供者:[
{AboutService,useClass:MocksService},
//HttpErrorHandler,
//消息服务
]
})
.compileComponents();
//
httpTestingController=TestBed.get(httpTestingController);
service=TestBed.get(关于服务);
}));
在每个之前(()=>{
fixture=TestBed.createComponent(关于组件);
组件=fixture.componentInstance;
fixture.detectChanges();
});
它('应该创建',()=>{
expect(component.toBeTruthy();
});
它('应该创建',()=>{
const-service:AboutService=TestBed.get(AboutService);
expect(service.toBeTruthy();
});
});
您只需注入它并创建spy来模拟您试图模拟/测试的任何东西:
const aboutService = TestBed.inject(AboutService);
const spy = spyOn(aboutService, 'getSkills').and.returnValue(of({...});
...
expect(spy).toHaveBeenCalled();
我是新来的。你能给我更多的代码吗,这样我就能理解它的用途了。是的,你可以把整个代码块放到你的
it(…)
函数(或规范)中。可以选择将服务器ICE注入移动到每个方法之前的中,以遵循与夹具
和组件
相同的模式,但这取决于您自己。