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