UserServiceStubs

1_UserServiceStub.java

public class UserService {

	private UserDAO userDAO;

	public UserService(UserDAO userDAO) {
		this.userDAO = userDAO;
	}

	public User signIn(Email email, Password password) throws AuthenticationException {
		User user;

		user = userDAO.findUserBy(email);
		// validation user
		if (!password.is(user.getPassword())) {
			throw new AuthenticationException("user has no permission");
		}
		// do something
		return user;
	}
}

2_UserDAOStub.java

public interface UserDAO {

	User findUserBy(Email email);

}

3_PasswordStub.java

public class Password {

	private String value;

	public Password(String value) {
		this.value = value;
	}

	public boolean is(String password) {
		return value.equals(password);
	}

}