angular-docs-cn/modules/@angular/common/test/directives/ng_template_outlet_spec.ts

/**
 * @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 {beforeEach, ddescribe, describe, expect, iit, inject, it, xit,} from '@angular/core/testing/testing_internal';
import {TestComponentBuilder} from '@angular/core/testing';
import {AsyncTestCompleter} from '@angular/core/testing/testing_internal';
import {Component, Directive, TemplateRef, ContentChildren, QueryList} from '@angular/core';
import {NgTemplateOutlet} from '@angular/common';

export function main() {
  describe('insert', () => {
    it('should do nothing if templateRef is null',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template = `<template [ngTemplateOutlet]="null"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {

                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('');

                   async.done();
                 });
           }));

    it('should insert content specified by TemplateRef',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template =
                 `<tpl-refs #refs="tplRefs"><template>foo</template></tpl-refs><template [ngTemplateOutlet]="currentTplRef"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {

                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('');

                   var refs = fixture.debugElement.children[0].references['refs'];

                   fixture.componentInstance.currentTplRef = refs.tplRefs.first;
                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('foo');

                   async.done();
                 });
           }));

    it('should clear content if TemplateRef becomes null',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template =
                 `<tpl-refs #refs="tplRefs"><template>foo</template></tpl-refs><template [ngTemplateOutlet]="currentTplRef"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {

                   fixture.detectChanges();
                   var refs = fixture.debugElement.children[0].references['refs'];

                   fixture.componentInstance.currentTplRef = refs.tplRefs.first;
                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('foo');

                   fixture.componentInstance.currentTplRef = null;
                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('');

                   async.done();
                 });
           }));

    it('should swap content if TemplateRef changes',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template =
                 `<tpl-refs #refs="tplRefs"><template>foo</template><template>bar</template></tpl-refs><template [ngTemplateOutlet]="currentTplRef"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {

                   fixture.detectChanges();
                   var refs = fixture.debugElement.children[0].references['refs'];

                   fixture.componentInstance.currentTplRef = refs.tplRefs.first;
                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('foo');

                   fixture.componentInstance.currentTplRef = refs.tplRefs.last;
                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('bar');

                   async.done();
                 });
           }));

    it('should display template if context is null',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template =
                 `<tpl-refs #refs="tplRefs"><template>foo</template></tpl-refs><template [ngTemplateOutlet]="currentTplRef" [ngOutletContext]="null"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {

                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('');

                   var refs = fixture.debugElement.children[0].references['refs'];

                   fixture.componentInstance.currentTplRef = refs.tplRefs.first;
                   fixture.detectChanges();
                   expect(fixture.nativeElement).toHaveText('foo');

                   async.done();
                 });
           }));

    it('should reflect initial context and changes',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template =
                 `<tpl-refs #refs="tplRefs"><template let-foo="foo"><span>{{foo}}</span></template></tpl-refs><template [ngTemplateOutlet]="currentTplRef" [ngOutletContext]="context"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {
                   fixture.detectChanges();

                   var refs = fixture.debugElement.children[0].references['refs'];
                   fixture.componentInstance.currentTplRef = refs.tplRefs.first;

                   fixture.detectChanges();
                   expect(fixture.debugElement.nativeElement).toHaveText('bar');

                   fixture.componentInstance.context.foo = 'alter-bar';

                   fixture.detectChanges();
                   expect(fixture.debugElement.nativeElement).toHaveText('alter-bar');

                   async.done();
                 });
           }));

    it('should reflect user defined $implicit property in the context',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template =
                 `<tpl-refs #refs="tplRefs"><template let-ctx><span>{{ctx.foo}}</span></template></tpl-refs><template [ngTemplateOutlet]="currentTplRef" [ngOutletContext]="context"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {
                   fixture.detectChanges();

                   var refs = fixture.debugElement.children[0].references['refs'];
                   fixture.componentInstance.currentTplRef = refs.tplRefs.first;

                   fixture.componentInstance.context = {
                     $implicit: fixture.componentInstance.context
                   };
                   fixture.detectChanges();
                   expect(fixture.debugElement.nativeElement).toHaveText('bar');

                   async.done();
                 });
           }));

    it('should reflect context re-binding',
       inject(
           [TestComponentBuilder, AsyncTestCompleter],
           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
             var template =
                 `<tpl-refs #refs="tplRefs"><template let-shawshank="shawshank"><span>{{shawshank}}</span></template></tpl-refs><template [ngTemplateOutlet]="currentTplRef" [ngOutletContext]="context"></template>`;
             tcb.overrideTemplate(TestComponent, template)
                 .createAsync(TestComponent)
                 .then((fixture) => {
                   fixture.detectChanges();

                   var refs = fixture.debugElement.children[0].references['refs'];
                   fixture.componentInstance.currentTplRef = refs.tplRefs.first;
                   fixture.componentInstance.context = {shawshank: 'brooks'};

                   fixture.detectChanges();
                   expect(fixture.debugElement.nativeElement).toHaveText('brooks');

                   fixture.componentInstance.context = {shawshank: 'was here'};

                   fixture.detectChanges();
                   expect(fixture.debugElement.nativeElement).toHaveText('was here');

                   async.done();
                 });
           }));
  });
}


@Directive({selector: 'tpl-refs', exportAs: 'tplRefs'})
class CaptureTplRefs {
  @ContentChildren(TemplateRef) tplRefs: QueryList<TemplateRef<any>>;
}

@Component({selector: 'test-cmp', directives: [NgTemplateOutlet, CaptureTplRefs], template: ''})
class TestComponent {
  currentTplRef: TemplateRef<any>;
  context: any = {foo: 'bar'};
}