Jasmine 期望null是真实的。茉莉花/因果报应
我试图测试注入到我创建的模拟类中的组件。虽然当我尝试测试组件的存在性时,该组件可以工作,但它返回null 可注射成分:Jasmine 期望null是真实的。茉莉花/因果报应,jasmine,angular6,karma-jasmine,Jasmine,Angular6,Karma Jasmine,我试图测试注入到我创建的模拟类中的组件。虽然当我尝试测试组件的存在性时,该组件可以工作,但它返回null 可注射成分: import { Injectable, ElementRef, Renderer2, RendererFactory2 } from '@angular/core'; @Injectable() export class NgBackdropComponent { private renderer: Renderer2; private appElementRef:
import { Injectable, ElementRef, Renderer2, RendererFactory2 } from '@angular/core';
@Injectable()
export class NgBackdropComponent {
private renderer: Renderer2;
private appElementRef: ElementRef;
message: string = 'Carregando...';
constructor(rendererFactory: RendererFactory2) {
this.renderer = rendererFactory.createRenderer(null, null);
this.appElementRef = new ElementRef(<Element>document.getElementsByTagName('body').item(0));
}
show() {
const divSpinnerItem1 = this.renderer.createElement('i');
const divSpinnerItem2 = this.renderer.createElement('i');
const divSpinnerItem3 = this.renderer.createElement('i');
const divSpinner = this.renderer.createElement('div');
this.renderer.addClass(divSpinner, 'spinner');
this.renderer.appendChild(divSpinner, divSpinnerItem1);
this.renderer.appendChild(divSpinner, divSpinnerItem2);
this.renderer.appendChild(divSpinner, divSpinnerItem3);
const spanMensagem = this.renderer.createElement('span');
spanMensagem.innerHTML = this.message;
const div = this.renderer.createElement('div');
this.renderer.addClass(div, 'lock-content');
this.renderer.appendChild(div, divSpinner);
this.renderer.appendChild(div, spanMensagem);
this.renderer.appendChild(this.appElementRef.nativeElement, div);
}
hide() {
const elemento = this.appElementRef.nativeElement.querySelector('.lock-content');
if (elemento) {
elemento.remove();
}
}
}
从'@angular/core'导入{Injectable,ElementRef,Renderer2,RendererFactory2};
@可注射()
导出类NgBackdropComponent{
私有渲染器:渲染器2;
私人上诉中心:ElementRef;
消息:string='Carregando…';
构造函数(渲染器工厂:渲染器工厂2){
this.renderer=rendererFactory.createRenderer(null,null);
this.appElementRef=newelementref(document.getElementsByTagName('body')。项(0));
}
show(){
const divSpinnerItem1=this.renderer.createElement('i');
const divSpinnerItem2=this.renderer.createElement('i');
const divSpinnerItem3=this.renderer.createElement('i');
const divSpinner=this.renderer.createElement('div');
addClass(divSpinner,'spinner');
appendChild(divSpinner,divSpinnerItem1);
appendChild(divSpinner,divSpinnerItem2);
this.renderer.appendChild(divSpinner,divSpinnerItem3);
const spanmensage=this.renderer.createElement('span');
spanmensage.innerHTML=this.message;
const div=this.renderer.createElement('div');
addClass(div,'lock content');
appendChild(div,divSpinner);
this.renderer.appendChild(div,spanmensage);
this.renderer.appendChild(this.appElementRef.nativeElement,div);
}
隐藏(){
const elemento=this.applementref.nativeElement.querySelector('.lock content');
如果(elemento){
elemento.remove();
}
}
}
我的测试环境:
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { NgBackdropComponent } from './ng-backdrop.component';
import { Component } from '@angular/core';
import { By } from '@angular/platform-browser';
@Component({
template: `
<button (click)="clickButton()"></button>
`
})
class MockNgBackdropComponent {
constructor(private backdrop: NgBackdropComponent) { }
clickButton() {
this.backdrop.message = 'Teste BackDrop aesdas';
this.backdrop.show();
console.log('iniciei backdrop');
}
closeBackdrop() {
this.backdrop.hide();
}
}
describe('NgBackdropComponent', () => {
let component: MockNgBackdropComponent;
let fixture: ComponentFixture<MockNgBackdropComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [MockNgBackdropComponent],
providers: [NgBackdropComponent]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(MockNgBackdropComponent);
component = fixture.componentInstance;
});
describe('Deve injetar', async () => {
it('Deve ter uma div principal', function () {
const btnClick = fixture.nativeElement.querySelector('button');
btnClick.click();
fixture.detectChanges();
const el = fixture.nativeElement.querySelector('.lock-content');
console.log(el);
expect(el).toBeTruthy();
});
});
});
从'@angular/core/testing'导入{async,ComponentFixture,TestBed};
从“./ng background.component”导入{NgBackdropComponent};
从'@angular/core'导入{Component};
从“@angular/platform browser”导入{By}”;
@组成部分({
模板:`
`
})
类MockNgBackdropComponent{
构造函数(私有背景:NgBackdropComponent){}
单击按钮(){
this.background.message='Teste background aesdas';
this.background.show();
console.log('iniciei background');
}
关闭背景(){
this.background.hide();
}
}
描述('NgBackdropComponent',()=>{
let组件:MockNgBackdropComponent;
let夹具:组件夹具;
beforeach(异步(()=>{
TestBed.configureTestingModule({
声明:[MockNgBackdropComponent],
提供者:[NgBackdropComponent]
})
.compileComponents();
}));
在每个之前(()=>{
fixture=TestBed.createComponent(MockNgBackdropComponent);
组件=fixture.componentInstance;
});
描述('deveinjetar',async()=>{
它('deveter uma div principal',函数(){
const btnClick=fixture.nativeElement.querySelector('button');
b单击。单击();
fixture.detectChanges();
const el=fixture.nativeElement.querySelector('.lock content');
控制台日志(el);
expect(el.toBeTruthy();
});
});
});
在测试中,我创建了一个模拟类,在其中注入我的组件。
我不明白为什么它找不到类,因为它存在。我认为您应该使用DebugElement,例如:
it('Deve ter uma div principal', function () {
const btnClick = fixture.debugElement.query(By.css('button'));
btnClick.click();
fixture.detectChanges();
const el = fixture.debugElement.query(By.css('.lock-content'));
console.log(el);
expect(el).toBeTruthy();
});
请跟随以获取更多信息 在组件中找不到它的原因是您没有在组件中创建它。如果您查看构造函数中的这一行:
this.appElementRef = new ElementRef(<Element>document.getElementsByTagName('body').item(0))
注意按钮是如何使用id=“root0”
在div中创建的?但是,带有class=“lock content”
的div是在根
元素下创建的,因此不在组件的div内
事实上,当您看到标记名是“div”,它的内部HTML是“code>,并且它有两个属性:id:“root0”
和ng version:“7.0.1”
时,您可以非常清楚地看到这一点。把这些放在一起,看起来是这样的:
<div id="root0" ng-version="7.0.1">
<button></button>
</div>
因此,您可以清楚地看到,您无法在组件中找到创建的div,因为它是在组件外部创建的
我希望这能有所帮助。很乐意帮忙。:)
<body>
<div class="jasmine_html-reporter">
<div class="jasmine-banner"><a class="jasmine-title" href="http://jasmine.github.io/" target="_blank"></a><span
class="jasmine-version">3.3.0</span></div>
<ul class="jasmine-symbol-summary"></ul>
<div class="jasmine-alert"></div>
<div class="jasmine-results">
<div class="jasmine-failures"></div>
</div>
</div>
<div id="nprogress" style="transition: none 0s ease 0s; opacity: 1;">
<div class="bar" role="bar" style="transform: translate3d(0%, 0px, 0px); transition: all 200ms ease 0s;">
<div class="peg"></div>
</div>
</div>
<div id="root0" ng-version="7.0.1">
<button></button>
</div>
<div class="lock-content">
<div class="spinner">
<i></i>
<i></i>
<i></i>
</div>
<span>Teste BackDrop aesdas</span>
</div>
</body>
<div id="root0" ng-version="7.0.1">
<button></button>
</div>