How to use toThrowCustomAsyncMatcherError method in Jest

1/**
2 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
3 *
4 * This source code is licensed under the MIT license found in the
5 * LICENSE file in the root directory of this source tree.
6 */
7
8expect.extend({toThrowCustomAsyncMatcherError});
9
10test('showing the stack trace for an async matcher', () =>
11  expect(true).toThrowCustomAsyncMatcherError());
12
13function toThrowCustomAsyncMatcherError() {
14  const message = () =>
15    'We expect the stack trace and code fence for this matcher to be shown in the console.';
16  return Promise.resolve({message, pass: false});
17}
18

Source: asynchronous.test.js

/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

expect.extend({toThrowCustomAsyncMatcherError});

test('showing the stack trace for an async matcher', () =>
  expect(true).toThrowCustomAsyncMatcherError());

function toThrowCustomAsyncMatcherError() {
  const message = () =>
    'We expect the stack trace and code fence for this matcher to be shown in the console.';
  return Promise.resolve({message, pass: false});
}