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

UserServiceUsingRepository.java

public class UserService {

    private UserRepository userRepository;

    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public User authenticate(String username, String password) {
        User foundUser = userRepository.findByUsername(username)
        return foundUser;
    }

}