[英]Angular unit test with @ContentChild fails
我在Angular Material菜單組件上關閉了一個自定義菜單,但我想對其進行測試,但是它一直失敗並輸出“ TypeError:無法讀取未定義的屬性'closeMenu'”
規格文件(底部測試):
@Component({
selector: 'app-test',
template: `
<app-header-menu>
<button [matMenuTriggerFor]="test">Test</button>
<mat-menu #test="matMenu">menu content</mat-menu>
</app-header-menu>
`
})
class TestComponent {}
describe('HeaderMenuComponent', () => {
let component: TestComponent;
let fixture: ComponentFixture<TestComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ TestComponent, HeaderMenuComponent ],
imports: [
MatMenuModule
]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(TestComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it ('should close on click', () => {
document.dispatchEvent(new MouseEvent('click'));
expect(fixture.debugElement.query(By.css('app-header-menu')).nativeElement.trigger.closeMenu()).toHaveBeenCalled();
});
});
組件文件:
export class HeaderMenuComponent {
@ContentChild(MatMenuTrigger) trigger: MatMenuTrigger;
@HostListener('document:click', ['$event'])
onClick = event => {
if (this.trigger && this.trigger.menuOpen && !this.elRef.nativeElement.contains(event.target)) {
this.trigger.closeMenu();
}
}
}
有人知道我在做什么錯嗎?
如果要測試@ContentChild(ren)
,則使用包裝器組件是正確的方法。
事實是,要測試觸發器是否關閉,您需要先打開它,然后才能實際觸發文檔上的click事件。
PFB我的測試設置和測試本身。 我還沒有發現為什么單擊該按鈕后無法打開該mat-menu
。 我直接使用內容子級觸發了openMenu。
從某種意義上說,恕我直言,無需測試角材的功能性,因此無論如何,直接觸發菜單對於您的測試用例來說應該沒問題。
我所做的不同,以測試設置中,我使用componentInstance
從具有MatMenuTrigger組件,因為本地的HtmlElement不具備觸發也沒有closeMenu方法窺探。
這是一個堆疊閃電戰 :
component.spec.ts
@Component({
selector: 'test-cmp',
template: `<app-component>
<button [matMenuTriggerFor]="test">Test</button>
<mat-menu #test="matMenu">menu content</mat-menu>
</app-component>`,
})
class TestWrapperComponent { }
describe('AppComponent', () => {
let component: AppComponent;
let fixture: ComponentFixture<TestWrapperComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [AppComponent, TestWrapperComponent],
providers: [],
imports: [MatMenuModule, BrowserAnimationsModule],
schemas: []
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(TestWrapperComponent);
component = fixture.debugElement.children[0].componentInstance;
});
it('should be created', () => {
fixture.detectChanges();
expect(component).toBeTruthy();
});
it ('should close on click', fakeAsync(() => {
fixture.detectChanges();
const closeMenueSpy: jasmine.Spy = spyOn(component.trigger, 'closeMenu');
// Not too sure why this menu doesn't open on click
// const debugElem: DebugElement = fixture.debugElement.query(By.css('button'));
// debugElem.triggerEventHandler('click', null);
component.trigger.openMenu();
tick();
expect(component.trigger.menuOpen).toBeTruthy();
document.dispatchEvent(new MouseEvent('click'));
tick();
expect(closeMenueSpy).toHaveBeenCalled();
}));
});
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