如何在Angular 2中模拟函数的click事件?对于我的Home Component,我有:
主页组件
import { Component } from '@angular/core';
import { Router } from '@angular/router';
@Component({
moduleId: module.id,
templateUrl: 'home.component.html',
styleUrls: ['home.component.css'],
selector: 'home',
})
export class HomeComponent {
constructor(private router: Router) {
}
redirectToUpload() {
this.router.navigate(['/upload']);
}
redirectToAbout() {
this.router.navigate(['/about']);
}
}
主页组件规范
import { ComponentFixture, TestBed, async } from '@angular/core/testing';
import { HomeComponent } from './home.component';
import { DebugElement } from '@angular/core';
import { By } from '@angular/platform-browser';
import { Router } from '@angular/router';
import { HomeModule } from './home.module';
import { RouterLinkStubDirective, RouterOutletStubComponent } from '../../../test/router-stubs';
import { RouterModule } from '@angular/router';
export function main() {
let de: DebugElement;
let comp: HomeComponent;
let fixture: ComponentFixture<HomeComponent>;
let mockRouter:any;
class MockRouter {
//noinspection TypeScriptUnresolvedFunction
navigate = jasmine.createSpy('navigate');
}
describe('Home component', () => {
// preparing module for testing
beforeEach(async(() => {
mockRouter = new MockRouter();
TestBed.configureTestingModule({
imports: [HomeModule],
}).overrideModule(HomeModule, {
remove: {
imports: [ RouterModule ],
},
add: {
declarations: [ RouterLinkStubDirective, RouterOutletStubComponent ],
providers: [ { provide: Router, useValue: mockRouter }],
}
}).compileComponents().then(() => {
fixture = TestBed.createComponent(HomeComponent);
comp = fixture.componentInstance;
});
}));
tests();
});
function tests() {
beforeEach(() => {
// trigger initial data binding
fixture.detectChanges();
de = fixture.debugElement.query(By.css('h1'));
});
it('can instantiate Home', () => {
expect(comp).not.toBeNull();
});
it('should have expected <h1> text', () => {
fixture.detectChanges();
const h1 = de.nativeElement;
expect(h1.innerText).toMatch("Home");
});
}
}
我想测试redirectToUpload()和redirectToAbout()。我如何模拟点击并确保重定向是指定链接?
答案 0 :(得分:7)
首先,我建议您在Typescript中编写测试,它会保持组件与测试之间的内聚。
以下是规范文件中的基本步骤:
获取元素(如果可能,我建议使用Id标记)
const element = fixture.debugElement.query(By.css("#your-element"));
触发事件。 注意:元素上必须有(click)
个事件
element.triggerEventHandler("click", null);
然后检测事件的变化
fixture.detectChanges();
在HTML模板中,您需要指向要测试的功能的点击事件(click)="redirectToUpload()"
答案 1 :(得分:6)
您需要获取按钮然后单击它
de.nativeElement.querySelector('.theButtonClass').click();
然后检查是否使用正确的参数
调用了存根的navigate
方法
expect(mockRouter.navigate).toHaveBeenCalledWith(['/about']);
您可能需要也可能不需要async
。如果它不起作用,您可能需要使用async
并等待异步点击事件以稳定
import { async } from '@angular/core/async';
it('..', async(() => {
...click();
fixture.whenStable().then(() => {
expect(mockRouter.navigate).toHaveBeenCalledWith(['/about']);
})
})