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server.test.js
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server.test.js
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/* eslint-disable global-require */
jest.mock('ws');
const WebSocket = require('ws');
const express = require('express');
const { version } = require('./package.json');
const authenticRequest = {
headers: {
authorization: 'test-auth-key',
'x-surang-version': version.split('.')[0],
},
};
const unauthenticRequest = {
headers: {
authorization: 'test-auth-other-key',
'x-surang-version': version.split('.')[0],
},
};
const remoteRequest = {
body: 'test-body',
cookies: 'test-cookies',
method: 'POST',
originalUrl: '/test/url',
headers: { 'test-header': 'test-value' },
};
const expectedRequestMsg = {
body: 'test-body',
cookies: 'test-cookies',
method: 'POST',
url: '/test/url',
headers: { 'test-header': 'test-value' },
reqID: 'test-uuid',
};
describe('server', () => {
const originalEnv = process.env;
const mockApp = express();
const mockServer = mockApp.server;
const mockSocket = {
write: jest.fn(),
destroy: jest.fn(),
};
beforeEach(() => {
jest.useFakeTimers();
process.env = { ...originalEnv };
mockApp.listen.mockClear();
mockServer.on.mockClear();
mockSocket.write.mockClear();
mockSocket.destroy.mockClear();
});
afterAll(() => {
process.env = originalEnv;
});
it('should setup express parsers and request handler', () => {
jest.isolateModules(() => require('./server'));
expect(mockApp.use).toHaveBeenCalledTimes(2);
expect(mockApp.use).toHaveBeenCalledWith('mock-cookie-parser');
expect(mockApp.use).toHaveBeenCalledWith('mock-json-parser');
expect(mockApp.all).toHaveBeenCalledTimes(1);
expect(mockApp.all.mock.calls[0][0]).toBe('*');
});
it('should respond with 503 to incoming requests if no client', () => {
jest.isolateModules(() => require('./server'));
const mockSend = jest.fn();
const mockStatus = jest.fn().mockReturnValue({ send: mockSend });
const mockRes = { status: mockStatus };
const requestCb = mockApp.all.mock.calls[0][1];
requestCb('test-req', mockRes);
expect(mockStatus).toHaveBeenCalledTimes(1);
expect(mockStatus).toHaveBeenCalledWith(503);
expect(mockSend).toHaveBeenCalledTimes(1);
expect(mockSend).toHaveBeenCalledWith('503: There is no one on the other side of the tunnel :/');
});
it('should forward request to WebSocketServer if client is connected', () => {
process.env.AUTH_KEY = 'test-auth-key';
jest.isolateModules(() => require('./server'));
const mockStatus = jest.fn();
const mockRes = { status: mockStatus, end: jest.fn() };
const upgradeCb = mockServer.on.mock.calls[0][1];
upgradeCb(authenticRequest, mockSocket);
const requestCb = mockApp.all.mock.calls[0][1];
requestCb(remoteRequest, mockRes);
expect(mockStatus).toHaveBeenCalledTimes(0);
expect(WebSocket.mock.ws.send).toHaveBeenCalledTimes(1);
expect(JSON.parse(WebSocket.mock.ws.send.mock.calls[0][0])).toEqual(
expectedRequestMsg,
);
});
it('should start listening on port 7000 if port is not provided', () => {
jest.isolateModules(() => require('./server'));
const consoleLogSpy = jest.spyOn(console, 'log').mockImplementation();
expect(mockApp.listen).toHaveBeenCalledTimes(1);
expect(mockApp.listen.mock.calls[0][0]).toBe(7000);
const successCb = mockApp.listen.mock.calls[0][1];
successCb();
expect(consoleLogSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledWith('Listening on port: 7000');
consoleLogSpy.mockRestore();
});
it('should start listening on provided port', () => {
process.env.PORT = 6500;
jest.isolateModules(() => require('./server'));
const consoleLogSpy = jest.spyOn(console, 'log').mockImplementation();
expect(mockApp.listen).toHaveBeenCalledTimes(1);
expect(mockApp.listen.mock.calls[0][0]).toBe(6500);
const successCb = mockApp.listen.mock.calls[0][1];
successCb();
expect(consoleLogSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledWith('Listening on port: 6500');
consoleLogSpy.mockRestore();
});
it('should add listener for upgrade event', () => {
jest.isolateModules(() => require('./server'));
expect(mockServer.on).toHaveBeenCalledTimes(1);
expect(mockServer.on.mock.calls[0][0]).toBe('upgrade');
});
it('should reject with 423 if second client tries to connect', () => {
process.env.AUTH_KEY = 'test-auth-key';
jest.isolateModules(() => require('./server'));
const upgradeCb = mockServer.on.mock.calls[0][1];
upgradeCb(authenticRequest, mockSocket);
expect(mockSocket.destroy).toHaveBeenCalledTimes(0);
upgradeCb(authenticRequest, mockSocket);
expect(mockSocket.write).toHaveBeenCalledTimes(1);
expect(mockSocket.write).toHaveBeenCalledWith(
'HTTP/1.1 423 Locked\r\n\r\nAlready connected with another client.\r\n',
);
expect(mockSocket.destroy).toHaveBeenCalledTimes(1);
});
it('should reject with 401 if unauthorized', () => {
process.env.AUTH_KEY = 'test-auth-key';
jest.isolateModules(() => require('./server'));
const upgradeCb = mockServer.on.mock.calls[0][1];
upgradeCb(unauthenticRequest, mockSocket);
expect(mockSocket.write).toHaveBeenCalledTimes(1);
expect(mockSocket.write).toHaveBeenCalledWith(
'HTTP/1.1 401 Unauthorized\r\n\r\n'
+ 'Unauthorized. Please, configure with a valid Auth key.\r\n',
);
expect(mockSocket.destroy).toHaveBeenCalledTimes(1);
});
it('should not connect to unauthentic client', () => {
process.env.AUTH_KEY = 'test-auth-key';
jest.isolateModules(() => require('./server'));
const upgradeCb = mockServer.on.mock.calls[0][1];
upgradeCb(unauthenticRequest, mockSocket);
expect(mockSocket.destroy).toHaveBeenCalledTimes(1);
upgradeCb(authenticRequest, mockSocket);
expect(mockSocket.destroy).toHaveBeenCalledTimes(1);
upgradeCb(authenticRequest, mockSocket);
expect(mockSocket.destroy).toHaveBeenCalledTimes(2);
});
it('should not reject second client if first is already disconnected', () => {
process.env.AUTH_KEY = 'test-auth-key';
jest.isolateModules(() => require('./server'));
const upgradeCb = mockServer.on.mock.calls[0][1];
upgradeCb(authenticRequest, mockSocket);
expect(mockSocket.destroy).toHaveBeenCalledTimes(0);
upgradeCb(authenticRequest, mockSocket);
expect(mockSocket.destroy).toHaveBeenCalledTimes(1);
WebSocket.mock.ws.emitClose();
upgradeCb(authenticRequest, mockSocket);
expect(mockSocket.destroy).toHaveBeenCalledTimes(1);
});
});