react-native/Libraries/Utilities/__tests__/SceneTracker-test.js

29 lines
928 B
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
'use strict';
const SceneTracker = require('SceneTracker');
describe('setActiveScene', function() {
it('can handle multiple listeners and unsubscribe', function() {
const listeners = [jest.fn(), jest.fn(), jest.fn()];
const subscriptions = listeners.map(
(listener) => SceneTracker.addActiveSceneChangedListener(listener)
);
subscriptions[1].remove();
const newScene = {name: 'scene1'};
SceneTracker.setActiveScene(newScene);
expect(listeners[0]).toBeCalledWith(newScene);
expect(listeners[1]).not.toBeCalled();
expect(listeners[2]).toBeCalledWith(newScene);
});
});