Tdd examples from http://scholarcoder.com/1392/ttd-intro

UserServiceStep1UserCollection.java

public class UserService {
    
    List<User> users = new ArrayList<>();
    {
        User user = new User();
        user.username = "adrianvdh";
        user.password = "hello123";
        users.add(user);
    }

    public User authenticate(String username, String password) {
        return this.users.get(0);
    }
}