How to use toThrowCustomAsyncMatcherError method in Jest

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asynchronous.test.js

Source: asynchronous.test.js Github

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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
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