问题描述
在使用@ ngneat / spectator的Angular 9组件测试中,我遇到了模拟子组件的问题。模拟和传递模拟可以正常工作,但是会在日志中为输入抛出警告(即使它们有效)。
简化的组件如下:
@Component({
selector: 'child',template: '<h2>{{someInput}}</h2>'
})
export class ChildComponent {
@input() someInput: string;
}
@Component({
selector: 'parent',template: '<child [someInput]="inputVal"></child>'
})
export class ParentComponent {
public inputVal = 'hello';
}
现在是观众测试
import { createComponentFactory,spectator } from '@ngneat/spectator/jest';
import { MockComponent } from 'ng-mocks';
...
describe('ParentComponent',() => {
let spectator: spectator<ParentComponent>;
let createComponent: spectatorFactory<ParentComponent>;
beforeEach(() => {
createComponent = createComponentFactory({
component: ParentComponent,declarations: [MockComponent(ChildComponent)]
});
spectator = createComponent();
});
describe('example',() => {
it('should set the input',() => {
expect(spectator.query(ChildComponent).someInput).toEqual('hello');
});
});
});
测试运行正常并通过。但是,日志会显示警告:
console.warn
Can't bind to 'someInput' since it isn't a kNown property of 'child'.
有什么想法为什么要记录警告?
解决方法
发现了我自己的问题-事实证明createComponentFactory()
必须在beforeEach()
之外被调用。
一旦我将其从beforeEach
块中移出,模拟就开始按预期工作。