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child.test.js
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child.test.js
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/**
* Copyright (c) 2017-present, Facebook, Inc. 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';
const mockError = new TypeError('Booo');
const mockExtendedError = new ReferenceError('Booo extended');
const processExit = process.exit;
const processSend = process.send;
const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
import {
CHILD_MESSAGE_INITIALIZE,
CHILD_MESSAGE_CALL,
CHILD_MESSAGE_END,
PARENT_MESSAGE_OK,
PARENT_MESSAGE_ERROR,
} from '../types';
let mockCount;
beforeEach(() => {
mockCount = 0;
jest.mock(
'../my-fancy-worker',
() => {
mockCount++;
return {
fooPromiseThrows() {
return new Promise((resolve, reject) => {
setTimeout(() => reject(mockError), 5);
});
},
fooPromiseWorks() {
return new Promise((resolve, reject) => {
setTimeout(() => resolve(1989), 5);
});
},
fooThrows() {
throw mockError;
},
fooThrowsANumber() {
// eslint-disable-next-line no-throw-literal
throw 412;
},
fooThrowsAnErrorWithExtraProperties() {
mockExtendedError.baz = 123;
mockExtendedError.qux = 456;
throw mockExtendedError;
},
fooThrowsNull() {
// eslint-disable-next-line no-throw-literal
throw null;
},
fooWorks() {
return 1989;
},
};
},
{virtual: true},
);
jest.mock(
'../my-fancy-standalone-worker',
() => jest.fn().mockImplementation(() => 12345),
{virtual: true},
);
// This mock emulates a transpiled Babel module that carries a default export
// that corresponds to a method.
jest.mock(
'../my-fancy-babel-worker',
() => ({
__esModule: true,
default: jest.fn().mockImplementation(() => 67890),
}),
{virtual: true},
);
process.exit = jest.fn();
process.send = jest.fn();
// Require the child!
require('../child');
});
afterEach(() => {
jest.resetModules();
process.removeAllListeners('message');
process.exit = processExit;
process.send = processSend;
});
it('lazily requires the file', () => {
expect(mockCount).toBe(0);
process.emit('message', [
CHILD_MESSAGE_INITIALIZE,
true, // Not really used here, but for flow type purity.
'./my-fancy-worker',
]);
expect(mockCount).toBe(0);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooWorks',
[],
]);
expect(mockCount).toBe(1);
});
it('returns results immediately when function is synchronous', () => {
process.send = jest.fn();
process.emit('message', [
CHILD_MESSAGE_INITIALIZE,
true, // Not really used here, but for flow type purity.
'./my-fancy-worker',
]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooWorks',
[],
]);
expect(process.send.mock.calls[0][0]).toEqual([PARENT_MESSAGE_OK, 1989]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooThrows',
[],
]);
expect(process.send.mock.calls[1][0]).toEqual([
PARENT_MESSAGE_ERROR,
'TypeError',
'Booo',
mockError.stack,
{},
]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooThrowsANumber',
[],
]);
expect(process.send.mock.calls[2][0]).toEqual([
PARENT_MESSAGE_ERROR,
'Number',
void 0,
void 0,
412,
]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooThrowsAnErrorWithExtraProperties',
[],
]);
expect(process.send.mock.calls[3][0]).toEqual([
PARENT_MESSAGE_ERROR,
'ReferenceError',
'Booo extended',
mockExtendedError.stack,
{baz: 123, qux: 456},
]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooThrowsNull',
[],
]);
expect(process.send.mock.calls[4][0][0]).toBe(PARENT_MESSAGE_ERROR);
expect(process.send.mock.calls[4][0][1]).toBe('Error');
expect(process.send.mock.calls[4][0][2]).toEqual(
'"null" or "undefined" thrown',
);
expect(process.send.mock.calls.length).toBe(5);
});
it('returns results when it gets resolved if function is asynchronous', async () => {
jest.useRealTimers();
process.emit('message', [
CHILD_MESSAGE_INITIALIZE,
true, // Not really used here, but for flow type purity.
'./my-fancy-worker',
]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooPromiseWorks',
[],
]);
await sleep(10);
expect(process.send.mock.calls[0][0]).toEqual([PARENT_MESSAGE_OK, 1989]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooPromiseThrows',
[],
]);
await sleep(10);
expect(process.send.mock.calls[1][0]).toEqual([
PARENT_MESSAGE_ERROR,
'TypeError',
'Booo',
mockError.stack,
{},
]);
expect(process.send.mock.calls.length).toBe(2);
});
it('calls the main module if the method call is "default"', () => {
process.emit('message', [
CHILD_MESSAGE_INITIALIZE,
true, // Not really used here, but for flow type purity.
'./my-fancy-standalone-worker',
]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'default',
[],
]);
expect(process.send.mock.calls[0][0]).toEqual([PARENT_MESSAGE_OK, 12345]);
});
it('calls the main export if the method call is "default" and it is a Babel transpiled one', () => {
process.emit('message', [
CHILD_MESSAGE_INITIALIZE,
true, // Not really used here, but for flow type purity.
'./my-fancy-babel-worker',
]);
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'default',
[],
]);
expect(process.send.mock.calls[0][0]).toEqual([PARENT_MESSAGE_OK, 67890]);
});
it('finishes the process with exit code 0 if requested', () => {
process.emit('message', [
CHILD_MESSAGE_INITIALIZE,
true, // Not really used here, but for flow type purity.
'./my-fancy-worker',
]);
process.emit('message', [
CHILD_MESSAGE_END,
true, // Not really used here, but for flow type purity.
]);
expect(process.exit.mock.calls[0]).toEqual([0]);
});
it('throws if an invalid message is detected', () => {
// Type 27 does not exist.
expect(() => {
process.emit('message', [27]);
}).toThrow(TypeError);
});
it('throws if child is not forked', () => {
delete process.send;
process.emit('message', [
CHILD_MESSAGE_INITIALIZE,
true, // Not really used here, but for flow type purity.
'./my-fancy-worker',
]);
expect(() => {
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooWorks',
[],
]);
}).toThrow();
expect(() => {
process.emit('message', [
CHILD_MESSAGE_CALL,
true, // Not really used here, but for flow type purity.
'fooThrows',
[],
]);
}).toThrow();
});