angular-cn/packages/core/test/acceptance/query_spec.ts

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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
*/
import {Component, ContentChild, ContentChildren, ElementRef, QueryList, TemplateRef, Type, ViewChild, ViewChildren} from '@angular/core';
import {TestBed} from '@angular/core/testing';
import {expect} from '@angular/platform-browser/testing/src/matchers';
import {onlyInIvy} from '@angular/private/testing';
describe('query logic', () => {
beforeEach(() => {
TestBed.configureTestingModule({declarations: [AppComp, QueryComp, SimpleCompA, SimpleCompB]});
});
it('should return Component instances when Components are labelled and retrieved via View query',
() => {
const template = `
<div><simple-comp-a #viewQuery></simple-comp-a></div>
<div><simple-comp-b #viewQuery></simple-comp-b></div>
`;
const fixture = initWithTemplate(QueryComp, template);
const comp = fixture.componentInstance;
expect(comp.viewChild).toBeAnInstanceOf(SimpleCompA);
expect(comp.viewChildren.first).toBeAnInstanceOf(SimpleCompA);
expect(comp.viewChildren.last).toBeAnInstanceOf(SimpleCompB);
});
it('should return Component instance when Component is labelled and retrieved via Content query',
() => {
const template = `
<local-ref-query-component #q>
<simple-comp-a #contentQuery></simple-comp-a>
</local-ref-query-component>
`;
const fixture = initWithTemplate(AppComp, template);
const comp = fixture.debugElement.children[0].references['q'];
expect(comp.contentChild).toBeAnInstanceOf(SimpleCompA);
expect(comp.contentChildren.first).toBeAnInstanceOf(SimpleCompA);
});
onlyInIvy('multiple local refs are supported in Ivy')
.it('should return Component instances when Components are labelled and retrieved via Content query',
() => {
const template = `
<local-ref-query-component #q>
<simple-comp-a #contentQuery></simple-comp-a>
<simple-comp-b #contentQuery></simple-comp-b>
</local-ref-query-component>
`;
const fixture = initWithTemplate(AppComp, template);
const comp = fixture.debugElement.children[0].references['q'];
expect(comp.contentChild).toBeAnInstanceOf(SimpleCompA);
expect(comp.contentChildren.first).toBeAnInstanceOf(SimpleCompA);
expect(comp.contentChildren.last).toBeAnInstanceOf(SimpleCompB);
expect(comp.contentChildren.length).toBe(2);
});
it('should return ElementRef when HTML element is labelled and retrieved via View query', () => {
const template = `
<div #viewQuery></div>
`;
const fixture = initWithTemplate(QueryComp, template);
const comp = fixture.componentInstance;
expect(comp.viewChild).toBeAnInstanceOf(ElementRef);
expect(comp.viewChildren.first).toBeAnInstanceOf(ElementRef);
});
onlyInIvy('multiple local refs are supported in Ivy')
.it('should return ElementRefs when HTML elements are labelled and retrieved via View query',
() => {
const template = `
<div #viewQuery #first>A</div>
<div #viewQuery #second>B</div>
`;
const fixture = initWithTemplate(QueryComp, template);
const comp = fixture.componentInstance;
expect(comp.viewChild).toBeAnInstanceOf(ElementRef);
expect(comp.viewChild.nativeElement)
.toBe(fixture.debugElement.children[0].nativeElement);
expect(comp.viewChildren.first).toBeAnInstanceOf(ElementRef);
expect(comp.viewChildren.last).toBeAnInstanceOf(ElementRef);
expect(comp.viewChildren.length).toBe(2);
});
it('should return TemplateRef when template is labelled and retrieved via View query', () => {
const template = `
<ng-template #viewQuery></ng-template>
`;
const fixture = initWithTemplate(QueryComp, template);
const comp = fixture.componentInstance;
expect(comp.viewChildren.first).toBeAnInstanceOf(TemplateRef);
});
onlyInIvy('multiple local refs are supported in Ivy')
.it('should return TemplateRefs when templates are labelled and retrieved via View query',
() => {
const template = `
<ng-template #viewQuery></ng-template>
<ng-template #viewQuery></ng-template>
`;
const fixture = initWithTemplate(QueryComp, template);
const comp = fixture.componentInstance;
expect(comp.viewChild).toBeAnInstanceOf(TemplateRef);
expect(comp.viewChild.elementRef.nativeElement)
.toBe(fixture.debugElement.childNodes[0].nativeNode);
expect(comp.viewChildren.first).toBeAnInstanceOf(TemplateRef);
expect(comp.viewChildren.last).toBeAnInstanceOf(TemplateRef);
expect(comp.viewChildren.length).toBe(2);
});
it('should return ElementRef when HTML element is labelled and retrieved via Content query',
() => {
const template = `
<local-ref-query-component #q>
<div #contentQuery></div>
</local-ref-query-component>
`;
const fixture = initWithTemplate(AppComp, template);
const comp = fixture.debugElement.children[0].references['q'];
expect(comp.contentChildren.first).toBeAnInstanceOf(ElementRef);
});
onlyInIvy('multiple local refs are supported in Ivy')
.it('should return ElementRefs when HTML elements are labelled and retrieved via Content query',
() => {
const template = `
<local-ref-query-component #q>
<div #contentQuery></div>
<div #contentQuery></div>
</local-ref-query-component>
`;
const fixture = initWithTemplate(AppComp, template);
const firstChild = fixture.debugElement.children[0];
const comp = firstChild.references['q'];
expect(comp.contentChild).toBeAnInstanceOf(ElementRef);
expect(comp.contentChild.nativeElement).toBe(firstChild.children[0].nativeElement);
expect(comp.contentChildren.first).toBeAnInstanceOf(ElementRef);
expect(comp.contentChildren.last).toBeAnInstanceOf(ElementRef);
expect(comp.contentChildren.length).toBe(2);
});
it('should return TemplateRef when template is labelled and retrieved via Content query', () => {
const template = `
<local-ref-query-component #q>
<ng-template #contentQuery></ng-template>
</local-ref-query-component>
`;
const fixture = initWithTemplate(AppComp, template);
const comp = fixture.debugElement.children[0].references['q'];
expect(comp.contentChildren.first).toBeAnInstanceOf(TemplateRef);
});
onlyInIvy('multiple local refs are supported in Ivy')
.it('should return TemplateRefs when templates are labelled and retrieved via Content query',
() => {
const template = `
<local-ref-query-component #q>
<ng-template #contentQuery></ng-template>
<ng-template #contentQuery></ng-template>
</local-ref-query-component>
`;
const fixture = initWithTemplate(AppComp, template);
const firstChild = fixture.debugElement.children[0];
const comp = firstChild.references['q'];
expect(comp.contentChild).toBeAnInstanceOf(TemplateRef);
expect(comp.contentChild.elementRef.nativeElement)
.toBe(firstChild.childNodes[0].nativeNode);
expect(comp.contentChildren.first).toBeAnInstanceOf(TemplateRef);
expect(comp.contentChildren.last).toBeAnInstanceOf(TemplateRef);
expect(comp.contentChildren.length).toBe(2);
});
});
function initWithTemplate(compType: Type<any>, template: string) {
TestBed.overrideComponent(compType, {set: new Component({template})});
const fixture = TestBed.createComponent(compType);
fixture.detectChanges();
return fixture;
}
@Component({selector: 'local-ref-query-component', template: '<ng-content></ng-content>'})
class QueryComp {
@ViewChild('viewQuery') viewChild !: any;
@ContentChild('contentQuery') contentChild !: any;
@ViewChildren('viewQuery') viewChildren !: QueryList<any>;
@ContentChildren('contentQuery') contentChildren !: QueryList<any>;
}
@Component({selector: 'app-comp', template: ``})
class AppComp {
}
@Component({selector: 'simple-comp-a', template: ''})
class SimpleCompA {
}
@Component({selector: 'simple-comp-b', template: ''})
class SimpleCompB {
}