sandromancuso

	@Test public void
	print_transactions_in_reverse_chronological_order() {
		given(clock.timeAsString()).willReturn("01/04/2014", "02/04/2014", "10/04/2014");

		account.deposit(1000);
		account.withdraw(100);
		account.deposit(500);

		account.printStatement();

sandromancuso

public class TripService {

	public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
		List<Trip> tripList = new ArrayList<Trip>();
		User loggedUser = loggedUser();
		boolean isFriend = false;
		if (loggedUser != null) {
			for (User friend : user.getFriends()) {
				if (friend.equals(loggedUser)) {
					isFriend = true;

sandromancuso

public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
	User loggedUser = loggedUser();
	validate(loggedUser);
	List<Trip> tripList = new ArrayList<Trip>();
	boolean isFriend = false;
	for (User friend : user.getFriends()) {
		if (friend.equals(loggedUser)) {
			isFriend = true;
			break;
		}

sandromancuso

@Test public void 
shouldReturnTrueWhenUsersAreFriends() throws Exception {
	User John = new User();
	User Bob = new User();
		
	John.addFriend(Bob);
		
	assertTrue(John.isFriendsWith(Bob));
}

sandromancuso

public class User {

        ... 

        private List<User> friends = new ArrayList<User>();

	public void addFriend(User user) {
		friends.add(user);
	}

sandromancuso

public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
	User loggedUser = loggedUser();
	validate(loggedUser);
	return (user.isFriendsWith(loggedUser)) 
				? findTripsByUser(user)
				: new ArrayList<Trip>();
}

sandromancuso

public class TripService {

	public List<Trip> getFriendTrips(User loggedUser, User friend) throws UserNotLoggedInException {
		validate(loggedUser);
		return (friend.isFriendsWith(loggedUser)) 
					? findTripsForFriend(friend)
					: new ArrayList<Trip>();
	}

	private void validate(User loggedUser) throws UserNotLoggedInException {

sandromancuso

public abstract class PrincingService {
    
    public double calculatePrice(ShoppingBasket shoppingBasket, User user, String voucher) {
        double discount = calculateDiscount(user);
        double total = 0;
        for (ShoppingBasket.Item item : shoppingBasket.items()) {
            total += calculateProductPrice(item.getProduct(), item.getQuantity());
        }
        total = applyAdditionalDiscounts(total, user, voucher);
        return total * ((100 - discount) / 100);

sandromancuso

public class StandardPricingServiceTest {

    private TestableStandardPricingService standardPricingService = new TestableStandardPricingService();
    
    @Test public void
    should_return_product_price_when_quantity_is_one() {
        Product book = aProduct().costing(10).build();

        double price = standardPricingService.calculateProductPrice(book, 1);

sandromancuso

public class StandardPriceCalculation {

    public double calculateProductPrice(Product product, int quantity) {
        return product.getPrice() * quantity;
    }
}