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fix(router): prevent
RouterLinkActive
from causing an infinite CD loop
fixes #15825
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/** | ||
* @license | ||
* Copyright Google Inc. All Rights Reserved. | ||
* | ||
* Use of this source code is governed by an MIT-style license that can be | ||
* found in the LICENSE file at https://angular.io/license | ||
*/ | ||
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import {CommonModule} from '@angular/common'; | ||
import {Component, NgModule, Type} from '@angular/core'; | ||
import {ComponentFixture, TestBed, fakeAsync, tick} from '@angular/core/testing'; | ||
import {Router} from '@angular/router'; | ||
import {RouterTestingModule} from '@angular/router/testing'; | ||
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describe('Integration', () => { | ||
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describe('routerLinkActive', () => { | ||
it('should not cause infinite loops in the change detection - #15825', fakeAsync(() => { | ||
@Component({selector: 'simple', template: 'simple'}) | ||
class SimpleCmp { | ||
} | ||
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@Component({ | ||
selector: 'some-root', | ||
template: ` | ||
<div *ngIf="show"> | ||
<ng-container *ngTemplateOutlet="tpl"></ng-container> | ||
</div> | ||
<router-outlet></router-outlet> | ||
<ng-template #tpl> | ||
<a routerLink="/simple" routerLinkActive="active"></a> | ||
</ng-template>` | ||
}) | ||
class MyCmp { | ||
show: boolean = false; | ||
} | ||
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@NgModule({ | ||
imports: [CommonModule, RouterTestingModule], | ||
declarations: [MyCmp, SimpleCmp], | ||
entryComponents: [SimpleCmp], | ||
}) | ||
class MyModule { | ||
} | ||
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TestBed.configureTestingModule({imports: [MyModule]}); | ||
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const router: Router = TestBed.get(Router); | ||
const fixture = createRoot(router, MyCmp); | ||
router.resetConfig([{path: 'simple', component: SimpleCmp}]); | ||
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router.navigateByUrl('/simple'); | ||
advance(fixture); | ||
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const instance = fixture.componentInstance; | ||
instance.show = true; | ||
expect(() => advance(fixture)).not.toThrow(); | ||
})); | ||
}); | ||
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}); | ||
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function advance<T>(fixture: ComponentFixture<T>): void { | ||
tick(); | ||
fixture.detectChanges(); | ||
} | ||
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function createRoot<T>(router: Router, type: Type<T>): ComponentFixture<T> { | ||
const f = TestBed.createComponent(type); | ||
advance(f); | ||
router.initialNavigation(); | ||
advance(f); | ||
return f; | ||
} |