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f541c34067
Summary: This PR add tests for several utilities in `Libraries/Utilities`, as a follow-up of #23903. The following utilities are now tested: * `clamp.js` * `binareToBase64.js` * `DeviceInfo.js` * `mergeIntoFast.js` * `PixelRatio.js` * `infoLog.js` * `logError.js` * `warnOnce.js` * `mapWithSeparator` (added a missing test) Not applicable, since it only adds tests. Pull Request resolved: https://github.com/facebook/react-native/pull/23989 Differential Revision: D14502806 Pulled By: cpojer fbshipit-source-id: e2c3b3a35f4f765d5336b998ab92dba14eeac7bc
28 lines
693 B
JavaScript
28 lines
693 B
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @emails oncall+react_native
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*/
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'use strict';
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describe('warnOnce', () => {
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const warnOnce = require('warnOnce');
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it('logs warning messages to the console exactly once', () => {
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console.error = jest.fn();
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warnOnce('test-message', 'This is a log message');
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warnOnce('test-message', 'This is a second log message');
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expect(console.error).toHaveBeenCalledWith(
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'Warning: This is a log message',
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);
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expect(console.error).toHaveBeenCalledTimes(1);
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});
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});
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