forked from jestjs/jest
/
index.test.js
179 lines (146 loc) · 4.28 KB
/
index.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';
let Farm;
let WorkerPool;
let Queue;
beforeEach(() => {
jest.mock('../Farm', () => {
const fakeClass = jest.fn(() => ({
doWork: jest.fn().mockResolvedValue(42),
}));
return {
__esModule: true,
default: fakeClass,
};
});
jest.mock('../WorkerPool', () => {
const fakeWorker = jest.fn(() => ({
createWorker: jest.fn(),
end: jest.fn(),
getStderr: () => jest.fn(a => a),
getStdout: () => jest.fn(a => a),
send: jest.fn(),
}));
return {
__esModule: true,
default: fakeWorker,
};
});
jest.mock(
'/fake-worker.js',
() => ({
_shouldNotExist1() {},
methodA() {},
methodB() {},
}),
{virtual: true},
);
jest.mock('/fake-worker-with-default-method.js', () => () => {}, {
virtual: true,
});
Farm = require('..').Worker;
Queue = require('../Farm').default;
WorkerPool = require('../WorkerPool').default;
});
afterEach(() => {
jest.resetModules();
});
it('makes a non-existing relative worker throw', () => {
expect(() => {
// eslint-disable-next-line no-new
new Farm('./relative/worker-module.js');
}).toThrow("'workerPath' must be absolute");
});
it('exposes the right API using default working', () => {
const farm = new Farm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
});
expect(typeof farm.foo).toBe('function');
expect(typeof farm.bar).toBe('function');
});
it('exposes the right API using passed worker', () => {
const WorkerPool = jest.fn(() => ({
createWorker: jest.fn(),
end: jest.fn(),
getStderr: () => jest.fn(a => a),
getStdout: () => jest.fn(a => a),
send: jest.fn(),
}));
const farm = new Farm('/tmp/baz.js', {
WorkerPool,
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
});
expect(typeof farm.foo).toBe('function');
expect(typeof farm.bar).toBe('function');
});
it('breaks if any of the forbidden methods is tried to be exposed', () => {
expect(
() => new Farm('/tmp/baz.js', {exposedMethods: ['getStdout']}),
).toThrow();
expect(
() => new Farm('/tmp/baz.js', {exposedMethods: ['getStderr']}),
).toThrow();
expect(() => new Farm('/tmp/baz.js', {exposedMethods: ['end']})).toThrow();
});
it('works with minimal options', () => {
const farm1 = new Farm('/fake-worker.js');
expect(Queue).toHaveBeenCalledTimes(1);
expect(WorkerPool).toHaveBeenCalledTimes(1);
expect(typeof farm1.methodA).toBe('function');
expect(typeof farm1.methodB).toBe('function');
expect(typeof farm1._shouldNotExist).not.toBe('function');
const farm2 = new Farm('/fake-worker-with-default-method.js');
expect(typeof farm2.default).toBe('function');
});
it('does not let make calls after the farm is ended', () => {
const farm = new Farm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
});
farm.end();
expect(farm._workerPool.end).toHaveBeenCalledTimes(1);
expect(() => farm.foo()).toThrow(
'Farm is ended, no more calls can be done to it',
);
expect(() => farm.bar()).toThrow(
'Farm is ended, no more calls can be done to it',
);
});
it('does not let end the farm after it is ended', async () => {
const farm = new Farm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
});
farm.end();
expect(farm._workerPool.end).toHaveBeenCalledTimes(1);
await expect(farm.end()).rejects.toThrow(
'Farm is ended, no more calls can be done to it',
);
await expect(farm.end()).rejects.toThrow(
'Farm is ended, no more calls can be done to it',
);
expect(farm._workerPool.end).toHaveBeenCalledTimes(1);
});
it('calls doWork', async () => {
const farm = new Farm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 1,
});
const promise = farm.foo('car', 'plane');
expect(await promise).toEqual(42);
});
it('calls getStderr and getStdout from worker', async () => {
const farm = new Farm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 1,
});
expect(farm.getStderr()('err')).toEqual('err');
expect(farm.getStdout()('out')).toEqual('out');
});