@johnf/react-native-owl/lib/module/websocket.test.js

Visual regression testing for React Native

"use strict";

import { createWebSocketClient, startWebSocketServer } from "./websocket.js";
import { Logger } from "./logger.js";
import { waitFor } from "./utils/wait-for.js";
describe('websocket.ts', () => {
  let wsServer;
  let wsClient1;
  let wsClient2;
  const serverLogger = new Logger();
  const client1Logger = new Logger();
  const client2Logger = new Logger();
  const mockServerLoggerInfo = jest.spyOn(serverLogger, 'info');
  const mockClient1LoggerInfo = jest.spyOn(client1Logger, 'info');
  const mockClient2LoggerInfo = jest.spyOn(client2Logger, 'info');
  const mockOnMessage = jest.fn(() => {});
  beforeEach(async () => {
    mockServerLoggerInfo.mockReset();
    mockClient1LoggerInfo.mockReset();
    mockClient2LoggerInfo.mockReset();
    mockOnMessage.mockReset();
    wsServer = await startWebSocketServer(serverLogger);
    wsClient1 = await createWebSocketClient(client1Logger, mockOnMessage);
    wsClient2 = await createWebSocketClient(client2Logger, mockOnMessage);
  });
  afterEach(() => {
    wsServer.close();
    wsClient1.close();
    wsClient2.close();
  });
  it('should start the server and accept client connections', async () => {
    await waitFor(5);
    expect(mockServerLoggerInfo).toHaveBeenNthCalledWith(1, '[OWL - WebSocket] Listening on port 8123.');
  });
  it('should forward messages to other clients', async () => {
    await wsClient1.send('Hello!');
    await waitFor(5);

    // We are just checking that client1 did not receive the message,
    // and that client2 did.
    // We are not concerned with the order of the logger calls.
    expect(mockClient1LoggerInfo.mock.calls.some(call => call[0] === '[OWL - WebSocket] The client received a message: Hello!.')).toBeFalsy();
    expect(mockClient2LoggerInfo.mock.calls.some(call => call[0] === '[OWL - WebSocket] The client received a message: Hello!.')).toBeTruthy();
  });
  it('should use the onMessage handler', async () => {
    await wsClient1.send('Hello!');
    await waitFor(5);

    // Check that the onMessage callback was used
    expect(mockOnMessage).toHaveBeenCalledTimes(1);
    expect(mockOnMessage).toHaveBeenCalledWith('Hello!');
  });
});
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