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});
}