使用Angular v4.4.4,我使用(submit)
元素上的<form>
事件保存表单。在实时代码上一切正常。但是,在单元测试中,单击<button>
不会触发(submit)
并且测试失败。例如,
组件(伪代码):
@Component({
template: `
<form [formGroup]="formGroup" (submit)="onSave()">
Your name: <input type="text" formControlName="name">
<button id="saveButton">Save</button>
</form>
`
})
export class FooComponent {
public formGroup: FormGroup;
public onSave(): void {
// save and route somewhere
}
}
单元测试(伪代码):
describe('FooComponent', () => {
let fixture, component, _router, routerSpy;
beforeAll(done => (async() => {
TestBed.configureTestingModule({
imports: [
RouterTestingModule.withRoutes([]),
FormsModule,
ReactiveFormsModule
]
});
fixture = TestBed.createComponent(FooComponent);
component = fixture.componentInstance;
_router = fixture.debugElement.injector.get(Router);
routerSpy = spyOn(_router, 'navigate');
fixture.detectChanges();
})().then(done).catch(done.fail));
it('should save the form', () => {
const saveButton = fixture.debugElement.query(By.css('#saveButton'));
saveButton.triggerEventHandler('click', null);
expect(routerSpy).toHaveBeenCalled();
// the test fails because the form is not actually submitted
});
});
我确定问题出在(submit)
事件上,因为如果我删除它并将onSave()
调用移动到按钮上的(click)
,则单元测试会起作用。
所以这在单元测试中失败了:
<form [formGroup]="formGroup" (submit)="onSave()">
但这成功了:
<button id="saveButton" (click)="onSave()">Save</button>
我在规范中做错了什么?
答案 0 :(得分:2)
因为按钮上没有事件处理程序。这就是为什么triggerEventHandler
无法触发按钮上的任何处理程序的原因。在您的情况下,您必须使用saveButton.nativeElement.click()
,因为现在点击事件将被冒泡并且submit
事件将被触发