Express.js Server with User Authentication

Unfortunately, the Code Generator AI cannot directly generate an Express.js server setup with user authentication middleware. However, here is an example of how you can set up an Express.js server with user authentication middleware using the express and passport packages in JavaScript:

// Import required packages
const express = require('express');
const session = require('express-session');
const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;

// Initialize Express.js app
const app = express();

// Set up session middleware
app.use(session({
  secret: 'your-secret-key',
  resave: false,
  saveUninitialized: false
}));

// Set up passport middleware
app.use(passport.initialize());
app.use(passport.session());

// Set up authentication strategy
passport.use(new LocalStrategy(
  // Replace with your own authentication logic
  (username, password, done) => {
    // Check if username and password are valid
    if (username === 'admin' && password === 'password') {
      return done(null, { username: 'admin' });
    } else {
      return done(null, false);
    }
  }
));

// Set up user serialization and deserialization
passport.serializeUser((user, done) => {
  done(null, user);
});

passport.deserializeUser((user, done) => {
  done(null, user);
});

// Set up protected route
app.get('/protected', (req, res) => {
  // Check if user is authenticated
  if (req.isAuthenticated()) {
    res.send('Protected route');
  } else {
    res.send('Unauthorized');
  }
});

// Set up login route
app.post('/login', passport.authenticate('local'), (req, res) => {
  res.send('Logged in successfully');
});

// Set up logout route
app.get('/logout', (req, res) => {
  req.logout();
  res.send('Logged out successfully');
});

// Start the server
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Example usage:

1. Install the required packages by running npm install express express-session passport passport-local.
2. Save the code to a file named server.js.
3. Start the server by running node server.js.
4. Open a web browser and navigate to http://localhost:3000/protected. You should see "Unauthorized" since you haven't logged in yet.
5. Send a POST request to http://localhost:3000/login with username "admin" and password "password". You should receive a response "Logged in successfully".
6. Refresh the browser page at http://localhost:3000/protected. You should now see "Protected route" since you are logged in.
7. To log out, navigate to http://localhost:3000/logout. You should receive a response "Logged out successfully".

Unit Testing:

To unit test the code, you can use testing frameworks like Mocha or Jest. Write test cases to verify the functionality of routes such as login, logout, and protected routes. Test if the routes return the expected responses and the user authentication behaves as expected.