@meyer/hyperdeck-emulator/src/__tests__/HyperDeckServer.spec.ts

Typescript Node.js library for emulating a Blackmagic Hyperdeck

import type { Socket } from 'net';
import { EventEmitter } from 'events';
import { getTestLogger } from './utils';
import { invariant } from '../invariant';

const noop = (): any => {
  return;
};

class MockSocket extends EventEmitter implements Pick<Socket, 'destroy' | 'setEncoding' | 'write'> {
  destroy = noop;
  setEncoding = noop;
  write = jest.fn();
}

jest.mock('net', () => ({
  createServer: (connectionListener?: (socket: MockSocket) => void) => {
    const mockSocket = new MockSocket();
    invariant(connectionListener, 'Missing connectionListener');
    connectionListener(mockSocket);
    return {
      listen: noop,
      on: noop,
      unref: noop,
    };
  },
}));

describe('HyperdeckServer', () => {
  beforeEach(() => {
    jest.clearAllMocks();
  });

  it('sends output back to the ATEM', async () => {
    expect.assertions(3);

    const logger = getTestLogger();

    const server = await import('../HyperDeckServer');
    const hyperdeck = new server.HyperDeckServer({ ip: '0.0.0.0' }, logger.logger);
    const socketEntries = Object.entries(hyperdeck['sockets']);
    expect(socketEntries.length).toBe(1);
    const hyperdeckSocket = socketEntries[0][1];
    const socket = hyperdeckSocket['socket'];

    socket.emit('data', 'banana');

    hyperdeck.close();

    await new Promise((resolve) => setTimeout(() => resolve(), 500));

    expect((socket.write as jest.Mock).mock.calls).toMatchInlineSnapshot(`
      Array [
        Array [
          "500 connection info:
      protocol version: 1.11
      model: NodeJS HyperDeck Server Library

      ",
        ],
      ]
    `);

    expect(logger.getLoggedOutput()).toMatchInlineSnapshot(`
      Array [
        Object {
          "level": 30,
          "msg": "connection",
        },
        Object {
          "cmd": undefined,
          "level": 30,
          "msg": "---> send response to client",
          "responseText": "500 connection info:
      protocol version: 1.11
      model: NodeJS HyperDeck Server Library

      ",
        },
        Object {
          "data": "banana",
          "level": 30,
          "msg": "<--- received message from client",
        },
        Object {
          "level": 50,
          "msg": "Invalid command: \`'banana'\`",
        },
        Object {
          "cmds": Array [],
          "level": 30,
          "msg": "parsed commands",
        },
      ]
    `);
  });
});