Unit testing Angular 2 RC4:具有依赖项注入的单元测试组件—具有自己的
由于Angular团队不断升级/弃用Angular 2 RC版本中的内容,我遇到了这个问题 我有一个具有依赖注入(DI)的组件,它实际上是一个服务(在本例中是UserService)。这个用户服务当然有自己的一些DIs。在升级到Angular 2的最新RC4之后,我意识到我不能再创建类似的测试了 因此,由于文档中没有提到相关内容,所以我的代码(针对这个问题简化了) 我的组件:Unit testing Angular 2 RC4:具有依赖项注入的单元测试组件—具有自己的,unit-testing,typescript,dependency-injection,angular,jasmine,Unit Testing,Typescript,Dependency Injection,Angular,Jasmine,由于Angular团队不断升级/弃用Angular 2 RC版本中的内容,我遇到了这个问题 我有一个具有依赖注入(DI)的组件,它实际上是一个服务(在本例中是UserService)。这个用户服务当然有自己的一些DIs。在升级到Angular 2的最新RC4之后,我意识到我不能再创建类似的测试了 因此,由于文档中没有提到相关内容,所以我的代码(针对这个问题简化了) 我的组件: import { Component } from '@angular/core'; import { MdButton
import { Component } from '@angular/core';
import { MdButton } from '@angular2-material/button';
import {
MdIcon,
MdIconRegistry
} from '@angular2-material/icon';
import { UserService } from '../../services/index';
@Component({
moduleId: module.id,
selector: 'logout-button',
templateUrl: 'logout-button.component.html',
styleUrls: ['logout-button.component.css'],
providers: [MdIconRegistry, UserService],
directives: [MdButton, MdIcon]
})
export class LogoutButtonComponent {
constructor(public userService: UserService) {}
/**
* Call UserService and logout() method
*/
logout() {
this.userService.logout();
}
}
import { Injectable } from '@angular/core';
import {
Http,
Headers
} from '@angular/http';
import {
AuthHttp,
JwtHelper
} from 'angular2-jwt';
import { Router } from '@angular/router';
import { UMS } from '../common/index';
@Injectable()
export class UserService {
constructor(
private router: Router,
private authHttp: AuthHttp,
private http: Http) {
this.router = router;
this.authHttp = authHttp;
this.http = http;
}
/**
* Logs out user
*/
public logout() {
this.authHttp.get(UMS.url + UMS.apis.logout)
.subscribe(
data => this.logoutSuccess(),
err => this.logoutSuccess()
);
}
}
import { By } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';
import {
beforeEach,
beforeEachProviders,
describe,
expect,
it,
inject,
fakeAsync,
TestComponentBuilder
} from '@angular/core/testing';
import { AuthHttp } from 'angular2-jwt';
import { Router } from '@angular/router';
import { Http } from '@angular/http';
import { LogoutButtonComponent } from './logout-button.component';
import { UserService } from '../../services/index';
describe('Component: LogoutButtonComponent', () => {
beforeEachProviders(() => [
LogoutButtonComponent,
UserService
]);
it('should inject UserService', inject([LogoutButtonComponent],
(component: LogoutButtonComponent) => {
expect(component).toBeTruthy();
}));
});
组件的DI、用户服务,如您所见,它有一些DI(路由器、AuthHttp和Http):
import { Component } from '@angular/core';
import { MdButton } from '@angular2-material/button';
import {
MdIcon,
MdIconRegistry
} from '@angular2-material/icon';
import { UserService } from '../../services/index';
@Component({
moduleId: module.id,
selector: 'logout-button',
templateUrl: 'logout-button.component.html',
styleUrls: ['logout-button.component.css'],
providers: [MdIconRegistry, UserService],
directives: [MdButton, MdIcon]
})
export class LogoutButtonComponent {
constructor(public userService: UserService) {}
/**
* Call UserService and logout() method
*/
logout() {
this.userService.logout();
}
}
import { Injectable } from '@angular/core';
import {
Http,
Headers
} from '@angular/http';
import {
AuthHttp,
JwtHelper
} from 'angular2-jwt';
import { Router } from '@angular/router';
import { UMS } from '../common/index';
@Injectable()
export class UserService {
constructor(
private router: Router,
private authHttp: AuthHttp,
private http: Http) {
this.router = router;
this.authHttp = authHttp;
this.http = http;
}
/**
* Logs out user
*/
public logout() {
this.authHttp.get(UMS.url + UMS.apis.logout)
.subscribe(
data => this.logoutSuccess(),
err => this.logoutSuccess()
);
}
}
import { By } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';
import {
beforeEach,
beforeEachProviders,
describe,
expect,
it,
inject,
fakeAsync,
TestComponentBuilder
} from '@angular/core/testing';
import { AuthHttp } from 'angular2-jwt';
import { Router } from '@angular/router';
import { Http } from '@angular/http';
import { LogoutButtonComponent } from './logout-button.component';
import { UserService } from '../../services/index';
describe('Component: LogoutButtonComponent', () => {
beforeEachProviders(() => [
LogoutButtonComponent,
UserService
]);
it('should inject UserService', inject([LogoutButtonComponent],
(component: LogoutButtonComponent) => {
expect(component).toBeTruthy();
}));
});
下面是组件的测试:
import { Component } from '@angular/core';
import { MdButton } from '@angular2-material/button';
import {
MdIcon,
MdIconRegistry
} from '@angular2-material/icon';
import { UserService } from '../../services/index';
@Component({
moduleId: module.id,
selector: 'logout-button',
templateUrl: 'logout-button.component.html',
styleUrls: ['logout-button.component.css'],
providers: [MdIconRegistry, UserService],
directives: [MdButton, MdIcon]
})
export class LogoutButtonComponent {
constructor(public userService: UserService) {}
/**
* Call UserService and logout() method
*/
logout() {
this.userService.logout();
}
}
import { Injectable } from '@angular/core';
import {
Http,
Headers
} from '@angular/http';
import {
AuthHttp,
JwtHelper
} from 'angular2-jwt';
import { Router } from '@angular/router';
import { UMS } from '../common/index';
@Injectable()
export class UserService {
constructor(
private router: Router,
private authHttp: AuthHttp,
private http: Http) {
this.router = router;
this.authHttp = authHttp;
this.http = http;
}
/**
* Logs out user
*/
public logout() {
this.authHttp.get(UMS.url + UMS.apis.logout)
.subscribe(
data => this.logoutSuccess(),
err => this.logoutSuccess()
);
}
}
import { By } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';
import {
beforeEach,
beforeEachProviders,
describe,
expect,
it,
inject,
fakeAsync,
TestComponentBuilder
} from '@angular/core/testing';
import { AuthHttp } from 'angular2-jwt';
import { Router } from '@angular/router';
import { Http } from '@angular/http';
import { LogoutButtonComponent } from './logout-button.component';
import { UserService } from '../../services/index';
describe('Component: LogoutButtonComponent', () => {
beforeEachProviders(() => [
LogoutButtonComponent,
UserService
]);
it('should inject UserService', inject([LogoutButtonComponent],
(component: LogoutButtonComponent) => {
expect(component).toBeTruthy();
}));
});
现在不要为这件事担心
如你所见,我;我在每个提供者之前的上添加相关提供者
在这种情况下,我在运行测试时出错:
错误:路由器没有提供程序!(注销按钮组件->用户服务->路由器)
比如说,这是意料之中的
因此,为了避免出现这些错误,我还将服务的DIs添加到提供者中:
beforeEachProviders(() => [
LogoutButtonComponent,
Router,
AuthHttp,
Http,
UserService
]);
但现在我发现了这个错误:
错误:无法解析“路由器”的所有参数(?、?、?、?、?、?、?、?、?)。确保所有参数都用Inject修饰或具有有效的类型注释,并且“Router”用Injectable修饰
我真的想弄清楚发生了什么,所以我在这里找到了一些相关的答案,但都是过时的,涵盖了旧的路由器弃用
或angular2/路由器
,但两者都弃用,不涵盖此案例
我希望在这方面能得到一些帮助,也许还需要一些资源,因为我找不到与最新版本路由器相关的任何东西:“@angular/Router”:“3.0.0-beta.2”
,以及RC4
谢谢
更新
我设法绕过了上面的两个错误,现在我可以访问组件了。以下是描述代码:
describe('Component: LogoutButtonComponent', () => {
let component: LogoutButtonComponent;
let router: any = Router;
let authHttp: any = AuthHttp;
let http: any = Http;
let service: any = new UserService(router, authHttp, http);
beforeEachProviders(() => [
LogoutButtonComponent
]);
beforeEach(() => {
component = new LogoutButtonComponent(service);
});
it('should inject UserService', () => {
expect(component.userService).toBeTruthy();
});
it('should logout user', () => {
localStorage.setItem('token', 'FOO');
component.logout();
expect(localStorage.getItem('token')).toBeUndefined();
});
});
但是,似乎即使DI服务被注入并可访问,服务的DIs也不可访问。现在我得到了这个错误:
TypeError:this.authHttp.get不是函数
有什么想法吗?看起来您遇到了依赖项循环问题,因为您的UserSerivce还需要注入AuthHttp、Http等。。。如果您需要测试您的组件,它确实会被干扰一次。
我的方法是创建一个mock UserSerivce并通过UserService.logout()
方法返回预期的mock值,因为您不必知道UserService中到底发生了什么,只需要返回值:
let MockUserService = {
logout() {
// return some value you need
}
}
然后,在测试套件中:
import { provide } from '@angular/core'
beforeEachProviders(() => [
provide(UserService, {useClass: MockUserService})
])
... detail test code here
我希望这对你有用。
这里有一个帖子对我很有帮助:
对于RC4,在测试中使用http需要一些变通方法。另请参见此问题(应在RC5中修复):
将此添加到我的unit-tests.html为我修复了它:
System.import('@angular/platform-browser/src/browser/browser_adapter').then(function(browser_adapter) {
browser_adapter.BrowserDomAdapter.makeCurrent();
})
在从jasmine测试中获取使用http的服务时,我遇到了类似的问题。不幸的是,我还没有在最新的RC中找到关于这些类型测试的文档。您是否尝试过使用UserService和Router的模拟?tymspy抱歉,因为还有很多事情要做,还没有。但是谢谢,当我要尝试的时候,我会告诉你结果的。