我在为Angular2组件的测试中为RouteParams依赖项注入模拟时遇到了一些麻烦。我的一般想法是,我可能会错过一些提供者。
测试失败:
Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.
有谁知道这个问题可能是什么?
import {
it,
inject,
injectAsync,
describe,
beforeEach,
beforeEachProviders,
TestComponentBuilder
} from 'angular2/testing';
import {Component, provide} from 'angular2/core';
import {BaseRequestOptions, Http} from 'angular2/http';
import {MockBackend} from 'angular2/http/testing';
import {RouteParams, ROUTER_PROVIDERS, ROUTER_PRIMARY_COMPONENT} from 'angular2/router';
// Load the implementations that should be tested
import {Home} from './home';
import {Title} from './providers/title';
describe('Home', () => {
// provide our implementations or mocks to the dependency injector
beforeEachProviders(() => [
Title,
Home,
provide(RouteParams, { useValue: new RouteParams({ id: '1' }) }),
BaseRequestOptions,
MockBackend,
provide(Http, {
useFactory: function(backend, defaultOptions) {
return new Http(backend, defaultOptions);
},
deps: [MockBackend, BaseRequestOptions]
}),
provide(RouteParams, {
useFactory: function() {
return new RouteParams({ 'id':'1' });
}
})
]);
it('should have a title', inject([ Home ], (home) => {
expect(home.title.value).toEqual('Angular 2');
}));
it('should have a http', inject([ Home ], (home) => {
expect(!!home.http).toEqual(true);
}));
it('should log ngOnInit', inject([ Home ], (home) => {
spyOn(console, 'log');
spyOn(console, 'info');
expect(console.log).not.toHaveBeenCalled();
expect(console.info).not.toHaveBeenCalled();
home.ngOnInit();
expect(console.log).toHaveBeenCalled();
expect(console.info).toHaveBeenCalledWith('1');
}));
});
答案 0 :(得分:9)
管理自己解决这个问题,你使用
provide(RouteParams, { useValue: new RouteParams({ id: '1' }) })模拟RouteProvider
import {
it,
inject,
injectAsync,
describe,
beforeEach,
beforeEachProviders,
TestComponentBuilder
} from 'angular2/testing';
import {Component, provide} from 'angular2/core';
import {BaseRequestOptions, Http} from 'angular2/http';
import {MockBackend} from 'angular2/http/testing';
import {RouteParams, ROUTER_PROVIDERS, ROUTER_PRIMARY_COMPONENT} from 'angular2/router';
// Load the implementations that should be tested
import {Home} from './home';
import {Title} from './providers/title';
describe('Home', () => {
// provide our implementations or mocks to the dependency injector
beforeEachProviders(() => [
Title,
Home,
provide(RouteParams, { useValue: new RouteParams({ id: '1' }) }),
BaseRequestOptions,
MockBackend,
provide(Http, {
useFactory: function(backend, defaultOptions) {
return new Http(backend, defaultOptions);
},
deps: [MockBackend, BaseRequestOptions]
})
]);
it('should have a title', inject([ Home ], (home) => {
expect(home.title.value).toEqual('Angular 2');
}));
it('should have a http', inject([ Home ], (home) => {
expect(!!home.http).toEqual(true);
}));
it('should log ngOnInit', inject([ Home ], (home) => {
spyOn(console, 'log');
spyOn(console, 'info');
expect(console.log).not.toHaveBeenCalled();
expect(console.info).not.toHaveBeenCalled();
home.ngOnInit();
expect(console.log).toHaveBeenCalled();
expect(console.info).toHaveBeenCalledWith('1');
}));
});
答案 1 :(得分:1)
对于那些在这里登陆的人,即使他们正在使用 Angular4
我只是继续创造了一个模拟。我想诀窍是嘲笑你需要的ActivatedRoute
部分。对我来说,这样做了:
import {ActivatedRoute, ParamMap} from '@angular/router';
/**
* Mocking the ActivatedRoute which is injected in the Component on creation.
* This allows for easier testing as values can be set as needed.
*/
class MockActivatedRoute {
paramMap = Observable.of(new Params());
}
/**
* Bare bones implementation of ParamMap used in mock. Further tests can expand
* on this implementation as needed.
*/
class Params implements ParamMap {
keys: string[];
private routes: {[key: string]: string|null} = {
subject: 'foo',
time: 'd-123-1',
device: 'all',
location: 'c-123'
};
constructor() {
this.keys = Object.keys(this.routes);
}
has(name: string): boolean {
throw new Error('Method not implemented.');
}
get(name: string): string|null {
return this.routes[name];
}
getAll(name: string): string[] {
throw new Error('Method not implemented.');
}
}
然后在您的测试模块中确保您提供真实ActivatedRoute
上的模拟服务:
providers: [
{
provide: ActivatedRoute,
useValue: new MockActivatedRoute(),
}
]
为了完成,我在组件I测试中使用它的方式:
ngOnInit() {
this.route.paramMap
.map((params: ParamMap) => params.get('subject') as string)
.subscribe((subject: string) => this.subject = subject);
}