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index.test.ts
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index.test.ts
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import type {JestWorkerFarm, Worker, WorkerFarmOptions} from '../';
import type FarmClass from '../Farm';
import type WorkerPoolClass from '../WorkerPool';
let WorkerFarm: typeof Worker;
let WorkerPool: typeof WorkerPoolClass;
let Farm: typeof FarmClass;
beforeEach(() => {
jest.mock('../Farm', () => {
const fakeClass = jest.fn(() => ({
doWork: jest.fn(() => 42),
}));
return {
__esModule: true,
default: fakeClass,
};
});
jest.mock('../WorkerPool', () => {
const fakeWorker = jest.fn(() => ({
createWorker: jest.fn(),
end: jest.fn(),
getStderr: () => '<mocked stderr>',
getStdout: () => '<mocked stdout>',
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,
});
WorkerFarm = (require('../') as typeof import('../')).Worker;
Farm = (require('../Farm') as typeof import('../Farm')).default;
WorkerPool = (require('../WorkerPool') as typeof import('../WorkerPool'))
.default;
});
afterEach(() => {
jest.resetModules();
});
it('makes a non-existing relative worker throw', () => {
expect(() => {
// eslint-disable-next-line no-new
new WorkerFarm('./relative/worker-module.js');
}).toThrow("'workerPath' must be absolute");
});
it('exposes the right API using default working', () => {
const farm = new WorkerFarm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
}) as JestWorkerFarm<{foo(): void; bar(): void}>;
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(),
getStdout: jest.fn(),
getWorkers: jest.fn(),
send: jest.fn(),
start: jest.fn(),
}));
const farm = new WorkerFarm('/tmp/baz.js', {
WorkerPool,
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
} as WorkerFarmOptions) as JestWorkerFarm<{foo(): void; bar(): void}>;
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 WorkerFarm('/tmp/baz.js', {exposedMethods: ['getStdout']}),
).toThrow('Cannot define a method called getStdout');
expect(
() => new WorkerFarm('/tmp/baz.js', {exposedMethods: ['getStderr']}),
).toThrow('Cannot define a method called getStderr');
expect(
() => new WorkerFarm('/tmp/baz.js', {exposedMethods: ['end']}),
).toThrow('Cannot define a method called end');
});
it('works with minimal options', () => {
const farm1 = new WorkerFarm('/fake-worker.js') as JestWorkerFarm<{
methodA(): void;
methodB(): void;
}>;
expect(Farm).toHaveBeenCalledTimes(1);
expect(WorkerPool).toHaveBeenCalledTimes(1);
expect(typeof farm1.methodA).toBe('function');
expect(typeof farm1.methodB).toBe('function');
expect(typeof farm1).toEqual(
expect.not.objectContaining({
_shouldNotExist: expect.anything,
}),
);
const farm2 = new WorkerFarm(
'/fake-worker-with-default-method.js',
) as JestWorkerFarm<{default(): void}>;
expect(typeof farm2.default).toBe('function');
});
it('does not let make calls after the farm is ended', () => {
const farm = new WorkerFarm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
}) as JestWorkerFarm<{foo(): void; bar(): void}>;
farm.end();
// @ts-expect-error: Testing internal method
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 WorkerFarm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 4,
});
farm.end();
// @ts-expect-error: Testing internal method
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',
);
// @ts-expect-error: Testing internal method
expect(farm._workerPool.end).toHaveBeenCalledTimes(1);
});
it('calls doWork', async () => {
const farm = new WorkerFarm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 1,
}) as JestWorkerFarm<{foo(a: string, b: string): number}>;
const promise = farm.foo('car', 'plane');
expect(await promise).toBe(42);
});
it('calls getStderr and getStdout from worker', async () => {
const farm = new WorkerFarm('/tmp/baz.js', {
exposedMethods: ['foo', 'bar'],
numWorkers: 1,
});
expect(farm.getStderr()).toBe('<mocked stderr>');
expect(farm.getStdout()).toBe('<mocked stdout>');
});