angular-docs-cn/packages/zone.js/test/zone-spec/sync-test.spec.ts

/**
 * @license
 * Copyright Google LLC 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 {ifEnvSupports} from '../test-util';

describe('SyncTestZoneSpec', () => {
  const SyncTestZoneSpec = (Zone as any)['SyncTestZoneSpec'];
  let testZoneSpec;
  let syncTestZone: Zone;

  beforeEach(() => {
    testZoneSpec = new SyncTestZoneSpec('name');
    syncTestZone = Zone.current.fork(testZoneSpec);
  });

  it('should fail on Promise.then', () => {
    syncTestZone.run(() => {
      expect(() => {
        Promise.resolve().then(function() {});
      }).toThrow(new Error('Cannot call Promise.then from within a sync test.'));
    });
  });

  it('should fail on setTimeout', () => {
    syncTestZone.run(() => {
      expect(() => {
        setTimeout(() => {}, 100);
      }).toThrow(new Error('Cannot call setTimeout from within a sync test.'));
    });
  });

  describe('event tasks', ifEnvSupports('document', () => {
             it('should work with event tasks', () => {
               syncTestZone.run(() => {
                 const button = document.createElement('button');
                 document.body.appendChild(button);
                 let x = 1;
                 try {
                   button.addEventListener('click', () => {
                     x++;
                   });

                   button.click();
                   expect(x).toEqual(2);

                   button.click();
                   expect(x).toEqual(3);
                 } finally {
                   document.body.removeChild(button);
                 }
               });
             });
           }));
});