angular-docs-cn/modules/@angular/common/test/directives/ng_switch_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 {NgSwitch, NgSwitchCase, NgSwitchDefault} from '@angular/common';
import {Component} from '@angular/core';
import {TestComponentBuilder} from '@angular/core/testing';
import {AsyncTestCompleter, beforeEach, ddescribe, describe, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
import {expect} from '@angular/platform-browser/testing/matchers';

export function main() {
  describe('switch', () => {
    describe('switch value changes', () => {
      it('should switch amongst when values',
         inject(
             [TestComponentBuilder, AsyncTestCompleter],
             (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
               var template = '<div>' +
                   '<ul [ngSwitch]="switchValue">' +
                   '<template ngSwitchCase="a"><li>when a</li></template>' +
                   '<template ngSwitchCase="b"><li>when b</li></template>' +
                   '</ul></div>';

               tcb.overrideTemplate(TestComponent, template)
                   .createAsync(TestComponent)
                   .then((fixture) => {
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('');

                     fixture.debugElement.componentInstance.switchValue = 'a';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when a');

                     fixture.debugElement.componentInstance.switchValue = 'b';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when b');

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

      // TODO(robwormald): deprecate and remove
      it('should switch amongst when values using switchWhen',
         inject(
             [TestComponentBuilder, AsyncTestCompleter],
             (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
               var template = '<div>' +
                   '<ul [ngSwitch]="switchValue">' +
                   '<template ngSwitchWhen="a"><li>when a</li></template>' +
                   '<template ngSwitchWhen="b"><li>when b</li></template>' +
                   '</ul></div>';

               tcb.overrideTemplate(TestComponent, template)
                   .createAsync(TestComponent)
                   .then((fixture) => {
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('');

                     fixture.debugElement.componentInstance.switchValue = 'a';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when a');

                     fixture.debugElement.componentInstance.switchValue = 'b';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when b');

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

      it('should switch amongst when values with fallback to default',
         inject(
             [TestComponentBuilder, AsyncTestCompleter],
             (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
               var template = '<div>' +
                   '<ul [ngSwitch]="switchValue">' +
                   '<li template="ngSwitchCase \'a\'">when a</li>' +
                   '<li template="ngSwitchDefault">when default</li>' +
                   '</ul></div>';

               tcb.overrideTemplate(TestComponent, template)
                   .createAsync(TestComponent)
                   .then((fixture) => {
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when default');

                     fixture.debugElement.componentInstance.switchValue = 'a';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when a');

                     fixture.debugElement.componentInstance.switchValue = 'b';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when default');

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

      it('should support multiple whens with the same value',
         inject(
             [TestComponentBuilder, AsyncTestCompleter],
             (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
               var template = '<div>' +
                   '<ul [ngSwitch]="switchValue">' +
                   '<template ngSwitchCase="a"><li>when a1;</li></template>' +
                   '<template ngSwitchCase="b"><li>when b1;</li></template>' +
                   '<template ngSwitchCase="a"><li>when a2;</li></template>' +
                   '<template ngSwitchCase="b"><li>when b2;</li></template>' +
                   '<template ngSwitchDefault><li>when default1;</li></template>' +
                   '<template ngSwitchDefault><li>when default2;</li></template>' +
                   '</ul></div>';

               tcb.overrideTemplate(TestComponent, template)
                   .createAsync(TestComponent)
                   .then((fixture) => {
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement)
                         .toHaveText('when default1;when default2;');

                     fixture.debugElement.componentInstance.switchValue = 'a';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when a1;when a2;');

                     fixture.debugElement.componentInstance.switchValue = 'b';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when b1;when b2;');

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

    describe('when values changes', () => {
      it('should switch amongst when values',
         inject(
             [TestComponentBuilder, AsyncTestCompleter],
             (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
               var template = '<div>' +
                   '<ul [ngSwitch]="switchValue">' +
                   '<template [ngSwitchCase]="when1"><li>when 1;</li></template>' +
                   '<template [ngSwitchCase]="when2"><li>when 2;</li></template>' +
                   '<template ngSwitchDefault><li>when default;</li></template>' +
                   '</ul></div>';

               tcb.overrideTemplate(TestComponent, template)
                   .createAsync(TestComponent)
                   .then((fixture) => {
                     fixture.debugElement.componentInstance.when1 = 'a';
                     fixture.debugElement.componentInstance.when2 = 'b';
                     fixture.debugElement.componentInstance.switchValue = 'a';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when 1;');

                     fixture.debugElement.componentInstance.switchValue = 'b';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when 2;');

                     fixture.debugElement.componentInstance.switchValue = 'c';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when default;');

                     fixture.debugElement.componentInstance.when1 = 'c';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when 1;');

                     fixture.debugElement.componentInstance.when1 = 'd';
                     fixture.detectChanges();
                     expect(fixture.debugElement.nativeElement).toHaveText('when default;');

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

@Component(
    {selector: 'test-cmp', directives: [NgSwitch, NgSwitchCase, NgSwitchDefault], template: ''})
class TestComponent {
  switchValue: any;
  when1: any;
  when2: any;

  constructor() {
    this.switchValue = null;
    this.when1 = null;
    this.when2 = null;
  }
}