/
sockets.test.js
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/
sockets.test.js
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import { SOCKET_PING } from '../src/_constants';
import { WebSocket, Server } from 'mock-socket';
import Socket from '../src/sockets';
global.WebSocket = WebSocket;
const url = 'ws://localhost:8080/';
// Create a promise that is resolved when the event is triggered.
const makeEventPromise = (emitter, event) => {
let resolver;
const promise = new Promise(resolve => (resolver = resolve));
emitter.on(event, data => resolver(data));
return promise;
};
describe('Sockets', () => {
let mockServer;
beforeEach(() => {
mockServer = new Server(url);
mockServer.connected = makeEventPromise(mockServer, 'connection');
});
afterEach(() => {
mockServer.close();
});
test('sends keep-alive messages automatically', async () => {
const keepAliveTimeout = 300,
expectedMessagesCount = 3,
messages = [],
expectedTypes = [];
// Creating a socket will open connection and start keep-alive pings.
new Socket({ url, keepAliveTimeout });
const serverSocket = await mockServer.connected;
serverSocket.on('message', message => messages.push(JSON.parse(message)));
await new Promise(done =>
setTimeout(
done,
keepAliveTimeout * expectedMessagesCount + keepAliveTimeout / 2
)
);
// One keep-alive message is sent right after connection, hence +1.
expect(messages).toHaveLength(expectedMessagesCount + 1);
for (let i = 0; i < expectedMessagesCount + 1; i++) {
expectedTypes.push(SOCKET_PING);
}
expect(messages.map(message => message['type'])).toEqual(expectedTypes);
});
test('triggers onOpen event', async () => {
const onOpen = jest.fn();
new Socket({ url, onOpen });
await mockServer.connected;
expect(onOpen).toHaveBeenCalledTimes(1);
});
test('triggers onClose event', async () => {
const closed = makeEventPromise(mockServer, 'close'),
onClose = jest.fn(),
mySocket = new Socket({
url,
onClose
});
await mockServer.connected;
mySocket.stop();
await closed;
expect(onClose).toHaveBeenCalledTimes(1);
expect(mySocket.timerId).toBeNull();
});
test('sends data correctly', async () => {
const testReqType = 'test',
testReqData = { blob: 1 },
testResponse = { response: 'test' },
testworkerId = 'test-worker',
mySocket = new Socket({
workerId: testworkerId,
url,
onMessage: data => data
});
const serverSocket = await mockServer.connected;
// Skip first keep-alive message.
await makeEventPromise(serverSocket, 'message');
const responsePromise = mySocket.send(testReqType, testReqData);
const message = await makeEventPromise(serverSocket, 'message');
serverSocket.send(JSON.stringify(testResponse));
const response = await responsePromise;
expect(JSON.parse(message)).toEqual({
type: testReqType,
data: testReqData
});
expect(response).toEqual(testResponse);
});
test('returns error when .send() fails', async () => {
const mySocket = new Socket({
url,
onMessage: data => data
});
const serverSocket = await mockServer.connected;
// Skip first keep-alive message.
await makeEventPromise(serverSocket, 'message');
const responsePromise = mySocket.send('test', {});
mockServer.simulate('error');
expect.assertions(1);
try {
await responsePromise;
} catch (e) {
expect(e).toBeDefined();
}
});
test('disconnects from server after .stop()', async () => {
const mySocket = new Socket({
url
});
await mockServer.connected;
expect(mockServer.clients()).toHaveLength(1);
mySocket.stop();
await new Promise(done => setTimeout(done, 100));
expect(mockServer.clients()).toHaveLength(0);
});
test('triggers onMessage event', async () => {
const testResponse = { response: 'test' },
testworkerId = 'test-worker',
onMessage = jest.fn(message => message),
mySocket = new Socket({
workerId: testworkerId,
url,
onMessage: onMessage
});
const serverSocket = await mockServer.connected;
// Skip first keep-alive message.
await makeEventPromise(serverSocket, 'message');
serverSocket.on('message', () => {
serverSocket.send(JSON.stringify(testResponse));
});
await mySocket.send('test1', {});
await mySocket.send('test2', {});
expect(onMessage).toHaveBeenCalledTimes(2);
expect(onMessage).toHaveBeenLastCalledWith(testResponse);
});
});