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messageParent.test.js
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messageParent.test.js
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/**
* 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.
*/
'use strict';
import {PARENT_MESSAGE_CUSTOM} from '../../types';
const processSend = process.send;
let messageParent;
let mockWorkerThreads;
beforeEach(() => {
mockWorkerThreads = {};
process.send = jest.fn();
jest.mock('worker_threads', () => mockWorkerThreads);
messageParent = require('../messageParent').default;
});
afterEach(() => {
jest.resetModules();
// console.log(require('worker_threads'));
process.send = processSend;
});
describe('with worker threads', () => {
beforeEach(() => {
mockWorkerThreads.parentPort = {
postMessage: jest.fn(),
};
});
it('cand send a message', () => {
messageParent('some-message');
expect(mockWorkerThreads.parentPort.postMessage).toHaveBeenCalledWith([
PARENT_MESSAGE_CUSTOM,
'some-message',
]);
});
it('removes circular references from the message being sent', () => {
const circular = {ref: null, some: 'thing'};
circular.ref = circular;
messageParent(circular);
expect(mockWorkerThreads.parentPort.postMessage).toHaveBeenCalledWith([
PARENT_MESSAGE_CUSTOM,
{
ref: '[Circular]',
some: 'thing',
},
]);
});
});
describe('without worker threads', () => {
it('cand send a message', () => {
messageParent('some-message');
expect(process.send).toHaveBeenCalledWith([
PARENT_MESSAGE_CUSTOM,
'some-message',
]);
});
it('removes circular references from the message being sent', () => {
const circular = {ref: null, some: 'thing'};
circular.ref = circular;
messageParent(circular);
expect(process.send).toHaveBeenCalledWith([
PARENT_MESSAGE_CUSTOM,
{
ref: '[Circular]',
some: 'thing',
},
]);
});
});