/
ChildProcessWorker.test.js
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/
ChildProcessWorker.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.
*/
import EventEmitter from 'events';
import {PassThrough} from 'stream';
import getStream from 'get-stream';
import supportsColor from 'supports-color';
import {
CHILD_MESSAGE_CALL,
CHILD_MESSAGE_INITIALIZE,
PARENT_MESSAGE_CLIENT_ERROR,
PARENT_MESSAGE_CUSTOM,
PARENT_MESSAGE_OK,
} from '../../types';
jest.useFakeTimers();
let Worker;
let forkInterface;
let childProcess;
let originalExecArgv;
beforeEach(() => {
jest.mock('child_process');
originalExecArgv = process.execArgv;
childProcess = require('child_process');
childProcess.fork.mockImplementation(() => {
forkInterface = Object.assign(new EventEmitter(), {
kill: jest.fn(),
send: jest.fn(),
stderr: new PassThrough(),
stdout: new PassThrough(),
});
return forkInterface;
});
Worker = require('../ChildProcessWorker').default;
});
afterEach(() => {
jest.resetModules();
process.execArgv = originalExecArgv;
});
it('passes fork options down to child_process.fork, adding the defaults', () => {
const child = require.resolve('../processChild');
process.execArgv = ['--inspect', '-p'];
// eslint-disable-next-line no-new
new Worker({
forkOptions: {
cwd: '/tmp',
execPath: 'hello',
},
maxRetries: 3,
workerId: process.env.JEST_WORKER_ID - 1,
workerPath: '/tmp/foo/bar/baz.js',
});
expect(childProcess.fork.mock.calls[0][0]).toBe(child);
expect(childProcess.fork.mock.calls[0][2]).toEqual({
cwd: '/tmp', // Overridden default option.
env: {...process.env, FORCE_COLOR: supportsColor.stdout ? '1' : undefined}, // Default option.
execArgv: ['-p'], // Filtered option.
execPath: 'hello', // Added option.
serialization: 'advanced', // Default option.
silent: true, // Default option.
});
});
it('passes workerId to the child process and assign it to 1-indexed env.JEST_WORKER_ID', () => {
// eslint-disable-next-line no-new
new Worker({
forkOptions: {},
maxRetries: 3,
workerId: 2,
workerPath: '/tmp/foo',
});
expect(childProcess.fork.mock.calls[0][2].env.JEST_WORKER_ID).toEqual('3');
});
it('initializes the child process with the given workerPath', () => {
// eslint-disable-next-line no-new
new Worker({
forkOptions: {},
maxRetries: 3,
setupArgs: ['foo', 'bar'],
workerPath: '/tmp/foo/bar/baz.js',
});
expect(forkInterface.send.mock.calls[0][0]).toEqual([
CHILD_MESSAGE_INITIALIZE,
false,
'/tmp/foo/bar/baz.js',
['foo', 'bar'],
]);
});
it('stops initializing the worker after the amount of retries is exceeded', () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo/bar/baz.js',
});
const request = [CHILD_MESSAGE_CALL, false, 'foo', []];
const onProcessStart = jest.fn();
const onProcessEnd = jest.fn();
worker.send(request, onProcessStart, onProcessEnd);
// We fail four times (initial + three retries).
forkInterface.emit('exit', 1);
forkInterface.emit('exit', 1);
forkInterface.emit('exit', 1);
forkInterface.emit('exit', 1);
expect(childProcess.fork).toHaveBeenCalledTimes(5);
expect(onProcessStart).toBeCalledWith(worker);
expect(onProcessEnd).toHaveBeenCalledTimes(1);
expect(onProcessEnd.mock.calls[0][0]).toBeInstanceOf(Error);
expect(onProcessEnd.mock.calls[0][0].type).toBe('WorkerError');
expect(onProcessEnd.mock.calls[0][1]).toBe(null);
});
it('provides stdout and stderr from the child processes', async () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
const stdout = worker.getStdout();
const stderr = worker.getStderr();
forkInterface.stdout.end('Hello ', 'utf8');
forkInterface.stderr.end('Jest ', 'utf8');
forkInterface.emit('exit', 1);
forkInterface.stdout.end('World!', 'utf8');
forkInterface.stderr.end('Workers!', 'utf8');
forkInterface.emit('exit', 0);
await expect(getStream(stdout)).resolves.toEqual('Hello World!');
await expect(getStream(stderr)).resolves.toEqual('Jest Workers!');
});
it('sends the task to the child process', () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
setupArgs: [],
workerPath: '/tmp/foo',
});
const request = [CHILD_MESSAGE_CALL, false, 'foo', []];
worker.send(
request,
() => {},
() => {},
);
// Skipping call "0" because it corresponds to the "initialize" one.
expect(forkInterface.send.mock.calls[1][0]).toEqual(request);
});
it('resends the task to the child process after a retry', () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo/bar/baz.js',
});
const request = [CHILD_MESSAGE_CALL, false, 'foo', []];
worker.send(
request,
() => {},
() => {},
);
// Skipping call "0" because it corresponds to the "initialize" one.
expect(forkInterface.send.mock.calls[1][0]).toEqual(request);
const previousForkInterface = forkInterface;
forkInterface.emit('exit', 1);
expect(forkInterface).not.toBe(previousForkInterface);
// Skipping call "0" because it corresponds to the "initialize" one.
expect(forkInterface.send.mock.calls[1][0]).toEqual(request);
});
it('calls the onProcessStart method synchronously if the queue is empty', () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
const onProcessStart = jest.fn();
const onProcessEnd = jest.fn();
worker.send(
[CHILD_MESSAGE_CALL, false, 'foo', []],
onProcessStart,
onProcessEnd,
);
// Only onProcessStart has been called
expect(onProcessStart).toHaveBeenCalledTimes(1);
expect(onProcessEnd).not.toHaveBeenCalled();
// then first call replies...
forkInterface.emit('message', [PARENT_MESSAGE_OK]);
expect(onProcessEnd).toHaveBeenCalledTimes(1);
});
it('can send multiple messages to parent', () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
const onProcessStart = jest.fn();
const onProcessEnd = jest.fn();
const onCustomMessage = jest.fn();
worker.send(
[CHILD_MESSAGE_CALL, false, 'foo', []],
onProcessStart,
onProcessEnd,
onCustomMessage,
);
// Only onProcessStart has been called
expect(onProcessStart).toHaveBeenCalledTimes(1);
expect(onProcessEnd).not.toHaveBeenCalled();
expect(onCustomMessage).not.toHaveBeenCalled();
// then first call replies...
forkInterface.emit('message', [
PARENT_MESSAGE_CUSTOM,
{message: 'foo bar', otherKey: 1},
]);
expect(onProcessEnd).not.toHaveBeenCalled();
expect(onCustomMessage).toHaveBeenCalledTimes(1);
expect(onCustomMessage).toHaveBeenCalledWith({
message: 'foo bar',
otherKey: 1,
});
});
it('creates error instances for known errors', () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
const callback1 = jest.fn();
const callback2 = jest.fn();
const callback3 = jest.fn();
// Testing a generic ECMAScript error.
worker.send([CHILD_MESSAGE_CALL, false, 'method', []], () => {}, callback1);
forkInterface.emit('message', [
PARENT_MESSAGE_CLIENT_ERROR,
'TypeError',
'bar',
'TypeError: bar',
{},
]);
expect(callback1.mock.calls[0][0]).toBeInstanceOf(TypeError);
expect(callback1.mock.calls[0][0].message).toBe('bar');
expect(callback1.mock.calls[0][0].type).toBe('TypeError');
expect(callback1.mock.calls[0][0].stack).toBe('TypeError: bar');
// Testing a custom error.
worker.send([CHILD_MESSAGE_CALL, false, 'method', []], () => {}, callback2);
forkInterface.emit('message', [
PARENT_MESSAGE_CLIENT_ERROR,
'RandomCustomError',
'bar',
'RandomCustomError: bar',
{qux: 'extra property'},
]);
expect(callback2.mock.calls[0][0]).toBeInstanceOf(Error);
expect(callback2.mock.calls[0][0].message).toBe('bar');
expect(callback2.mock.calls[0][0].type).toBe('RandomCustomError');
expect(callback2.mock.calls[0][0].stack).toBe('RandomCustomError: bar');
expect(callback2.mock.calls[0][0].qux).toBe('extra property');
// Testing a non-object throw.
worker.send([CHILD_MESSAGE_CALL, false, 'method', []], () => {}, callback3);
forkInterface.emit('message', [
PARENT_MESSAGE_CLIENT_ERROR,
'Number',
null,
null,
412,
]);
expect(callback3.mock.calls[0][0]).toBe(412);
});
it('throws when the child process returns a strange message', () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
worker.send(
[CHILD_MESSAGE_CALL, false, 'method', []],
() => {},
() => {},
);
// Type 27 does not exist.
expect(() => {
forkInterface.emit('message', [27]);
}).toThrow(TypeError);
});
it('does not restart the child if it cleanly exited', () => {
// eslint-disable-next-line no-new
new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
expect(childProcess.fork).toHaveBeenCalledTimes(1);
forkInterface.emit('exit', 0);
expect(childProcess.fork).toHaveBeenCalledTimes(1);
});
it('resolves waitForExit() after the child process cleanly exited', async () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
expect(childProcess.fork).toHaveBeenCalledTimes(1);
forkInterface.emit('exit', 0);
await worker.waitForExit(); // should not timeout
});
it('restarts the child when the child process dies', () => {
// eslint-disable-next-line no-new
new Worker({
workerPath: '/tmp/foo',
});
expect(childProcess.fork).toHaveBeenCalledTimes(1);
forkInterface.emit('exit', 1);
expect(childProcess.fork).toHaveBeenCalledTimes(2);
});
it('sends SIGTERM when forceExit() is called', async () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
worker.forceExit();
expect(forkInterface.kill.mock.calls).toEqual([['SIGTERM']]);
});
it('sends SIGKILL some time after SIGTERM', async () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
worker.forceExit();
jest.runAllTimers();
expect(forkInterface.kill.mock.calls).toEqual([['SIGTERM'], ['SIGKILL']]);
});
it('does not send SIGKILL if SIGTERM exited the process', async () => {
const worker = new Worker({
forkOptions: {},
maxRetries: 3,
workerPath: '/tmp/foo',
});
worker.forceExit();
forkInterface.emit('exit', 143 /* SIGTERM exit code */);
await Promise.resolve();
jest.runAllTimers();
expect(forkInterface.kill.mock.calls).toEqual([['SIGTERM']]);
});