我想了解更多關於Angular2單元測試的內容。 目前我無法獲得我的組件html模板中特定元素的計數。Angular2組件單元測試
我的組件
import { Component, OnInit } from '@angular/core';
@Component({
moduleId: module.id,
selector: 'cl-header',
templateUrl: 'cl-header.component.html',
styleUrls: ['cl-header.component.css']
})
export class ClHeaderComponent implements OnInit {
headerTitle: string = 'Some Title';
constructor() {}
ngOnInit() {
}
}
組件的HTML模板
<nav class="navbar navbar-default" role="navigation">
<ul class="nav navbar-nav">
<li><a href="#" class="fa fa-bars fa-2x"></a></li>
<li><a href="http://localhost:91/UserHome/" class="fa fa-home fa-2x no-padding"></a></li>
</ul>
<div class="nav navbar-text-center">{{headerTitle}}</div>
<a href="#" class="navbar-brand pull-right">
<img src="app/components/cl-header/shared/logo.png" height="28px" alt="logo" />
</a>
<i>testtext</i>
</nav>
我的SPEC文件
import {
beforeEach,
beforeEachProviders,
describe,
expect,
it,
inject,
injectAsync
} from '@angular/core/testing';
import { ComponentFixture, TestComponentBuilder } from '@angular/compiler/testing';
import { Component } from '@angular/core';
import { By } from '@angular/platform-browser';
import { ClHeaderComponent } from './cl-header.component';
describe('Component: ClHeader',() => {
it('should display header title: "Some Title"', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
return tcb.createAsync(ClHeaderComponent).then((fixture) => {
fixture.detectChanges();
var compiled = fixture.debugElement.nativeElement;
//WORKING
//To check that a given piece of text exists in the html template
//expect(compiled.innerHTML).toContain('ul');
//To check whether a given element type contains text
//expect(compiled.querySelector('div')).toHaveText('Some Title');
//END WORKING
//NOT WORKING - ALWAYS RETURNS SUCCESS NO MATTER WHAT THE TOEQUAL COUNT IS
//To check that a given element by type exists in the html template
expect(compiled.querySelector('div').length).toEqual(5);
});
}));
});
無論我如何設置toEqual表達式如下: expect(compiled.querySelector('div').length).toEqual(5);
測試將始終返回true。
有沒有人有任何建議如何準確得到組件html模板中給定的元素類型的計數?
謝謝
不知道這可能是'成功',但它應該是'querySelectorAll('div').length'。 – estus
首先,請確保您遵循@estus建議,因爲querySelector只會返回1個沒有'length'屬性的結果。接下來,您是否在瀏覽器中禁用了緩存?開放式開發人員工具通常會對此有所幫助 – Sjoerd
絕對是一個緩存問題。 'compiled.querySelector('div').length'會拋出一個異常。 – Michael