我似乎无法测试绑定到Angluar2模型的输入框。我对此有点新意,请耐心等待。
我有一个非常基本的Angular2组件,它包含一个绑定到模型的输入框。
<form>
<input type="text" [(ngModel)]="searchTerm" name="termsearchTerm" (keyup)="search()" value=""/>
</form>
这是背后的代码:
import { Component, Input, Output, EventEmitter } from '@angular/core';
@Component({
moduleId: module.id,
selector: 'sc-search',
templateUrl: 'search.component.html'
})
export class SearchComponent {
@Input() data: any;
@Output() onSearchTermChanged = new EventEmitter<string>();
private searchTerm: string;
search() {
this.onSearchTermChanged.emit(this.searchTerm);
}
}
运行以下测试时,请将Expected undefined设置为等于'John'。 我期待测试通过。
searchableHierarchyComponentFixture.detectChanges();
let termInputDbg = searchableHierarchyComponentFixture.debugElement.query(By.css('input[name="termsearchTerm"]'));
let input = searchableHierarchyComponentFixture.nativeElement.querySelector('input');
input.value = 'John';
let evt = document.createEvent('Event');
evt.initEvent('keyup', true, false);
termInputDbg.triggerEventHandler('keyup', null);
input.dispatchEvent(evt);
tick(50);
searchableHierarchyComponentFixture.detectChanges();
searchableHierarchyComponentFixture.whenStable();
expect(searchableHierarchyComponentFixture.componentInstance.searchTerm).toEqual('John');
答案 0 :(得分:4)
所以有几件事:
tick
。不完全确定,但我认为模型绑定是异步发生的。没有滴答作响,测试将失败。input
事件,而不是keyup
。发生input
事件时,指令会更新绑定。这是一个完整的测试(也在Plunker)
import { Component } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { TestBed, fakeAsync, tick } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
@Component({
selector: 'test',
template: `
<form>
<input type="text" [(ngModel)]="query" name="query" />
</form>
`
})
class TestComponent {
query: string;
}
describe('TestComponent: ngModel', () => {
let fixture;
let component;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [FormsModule],
declarations: [TestComponent]
});
fixture = TestBed.createComponent(TestComponent);
component = fixture.componentInstance;
});
it('should change the value', fakeAsync(() => {
let input = fixture.debugElement.query(By.css('input')).nativeElement;
fixture.detectChanges();
tick();
expect(component.query).toBeFalsy();
input.value = 'Hello World';
input.dispatchEvent(new Event('input'));
tick();
expect(component.query).toBe('Hello World');
}));
});
另见