1// Copyright (C) 2018 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15import {defer, Deferred} from './deferred'; 16 17test('deferred can resolve', async () => { 18 const deferred: Deferred<void> = defer<void>(); 19 let i = 0; 20 deferred.then(() => i++); 21 22 expect(i).toBe(0); 23 deferred.resolve(); 24 expect(i).toBe(0); 25 await deferred; 26 expect(i).toBe(1); 27}); 28 29test('deferred can resolve with value', () => { 30 const deferred: Deferred<string> = defer<string>(); 31 deferred.resolve('foo'); 32 return expect(deferred).resolves.toBe('foo'); 33}); 34 35test('deferred can reject', () => { 36 const deferred: Deferred<string> = defer<string>(); 37 deferred.reject('foo'); 38 return expect(deferred).rejects.toBe('foo'); 39}); 40