Detox/detox/test/mock-server/mock-server.js

const express = require('express');
const bodyParser = require('body-parser');

class Mockserver {
  constructor() {
    this.app = express();
    this.server = null;
    this.port = process.env.PORT || 9001;
  }

  init() {
    this.app.use(bodyParser.urlencoded({extended: true}));
    this.app.use(bodyParser.json());

    const router = express.Router();

    router.get('/', (_, res) => {
      res.json({message: 'hello world!'});
    });

    router.get('/hello-world.html', (_, res) => {
      res.send(`
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>Hello World</title>
        </head>
        <body>
            <header>
                <h1>Hello World!</h1>
            </header>
            <main>
                <form>
                    <label for="input-box" id="input-label">Your input:</label><br>
                    <input type="text" id="input-box" aria-labelledby="input-label" aria-required="true"><br>
                    <input type="submit" value="Send">
                </form>
            </main>
        </body>
        </html>
    `);
    });

    router.route('/delay/:delay')
          .get((req, res) => {
            console.log('Mock server', `GET delayed response, will reply in ${req.params.delay}ms`);
            setTimeout(() => {
              console.log('Mock server', `GET delayed response, responding now`);
              res.json({message: `Response was delayed by ${req.params.delay}ms`});
            }, req.params.delay);
          });

    this.app.use('/', router);

    this.server = this.app.listen(this.port);
    console.log('Mock server', `Listening on port ${this.port}`);
  }

  close() {
    return new Promise((resolve, reject) => {
      this.server.close(err => err ? reject(err) : resolve());
    });
  }
}

module.exports = Mockserver;