public void WhenActiveCartWithOneItemAndRemoveItemExpectEmptyCart()
{
var activeCart = new CartStateActive(new[] { Product.ProductY });
var newState = activeCart.Remove(Product.ProductY);
var isEmptyState = newState.Func(cartStateEmpty => true, cartStateActive => false, cartStatePaid => false);
Assert.IsTrue(isEmptyState);
}
public void WhenActiveCartWithOneItemAndAddItemExpectActiveCartWithTwoItems()
{
var activeCart1 = new CartStateActive(new[] { Product.ProductY });
var newState = activeCart1.Add(Product.ProductX);
var isActiveState = newState.Func(cartStateEmpty => false, cartStateActive => true, cartStatePaid => false);
Assert.IsTrue(isActiveState);
var itemCount = newState.Func(cartStateEmpty => -1, cartStateActive => cartStateActive.Items.Count(), cartStatePaid => -1);
Assert.That(itemCount, Is.EqualTo(2));
}
public void WhenActiveCartWithOneItemAndAddItemExpectActiveCartWithTwoItems()
{
// arrange
var activeCart1 = new CartStateActive(new[] { Product.ProductY });
// act
var newState = activeCart1.Add(Product.ProductX);
// assert
var activeState = newState as CartStateActive; //CAST!
if (activeState != null)
{
var itemCount = activeState.Items.Count();
Assert.That(itemCount, Is.EqualTo(2));
}
else
{
Assert.Fail("Expect CartStateActive");
}
}
public ICartState Add(Product item)
{
var newItems = new[] { item };
var newState = new CartStateActive(newItems);
return newState;
}
public ICartState VisitActive(CartStateActive active)
{
active.PayForCart(amountToPay); return active;
}
public ICartState VisitActive(CartStateActive active)
{
active.AddItem(productToAdd); return active;
}
public void WhenActiveCartWithTwoItemsAndPayExpectPaidCart()
{
var activeCart = new CartStateActive(new[] { Product.ProductX, Product.ProductY });
const decimal paidAmount = 12.34m;
var newState = activeCart.Pay(paidAmount);
var isPaidState = newState.Func(cartStateEmpty => false, cartStateActive => false, cartStatePaid => true);
Assert.IsTrue(isPaidState);
var itemCount = newState.Func(cartStateEmpty => -1, cartStateActive => -1, cartStatePaid => cartStatePaid.Items.Count());
Assert.That(itemCount, Is.EqualTo(2));
var actualPaidAmount = newState.Func(cartStateEmpty => -1, cartStateActive => -1, cartStatePaid => cartStatePaid.Amount);
Assert.That(actualPaidAmount, Is.EqualTo(paidAmount));
}
public void WhenActiveCartWithOneItemAndRemoveItemExpectEmptyCart()
{
// arrange
var activeCart = new CartStateActive(new[] { Product.ProductY });
// act
var newState = activeCart.Remove(Product.ProductY);
// assert
var emptyState = newState as CartStateEmpty; //CAST!
if (emptyState == null)
{
Assert.Fail("Expect CartStateEmpty");
}
}
public void WhenActiveCartWithTwoItemsAndPayExpectPaidCart()
{
var activeCart = new CartStateActive(new[] { Product.ProductX, Product.ProductY });
const decimal paidAmount = 12.34m;
var newState = activeCart.Pay(paidAmount);
// assert
var paidState = newState as CartStatePaid; //CAST!
if (paidState != null)
{
var itemCount = paidState.Items.Count();
Assert.That(itemCount, Is.EqualTo(2));
var actualPaidAmount = paidState.Amount;
Assert.That(actualPaidAmount, Is.EqualTo(paidAmount));
}
else
{
Assert.Fail("Expect CartStateActive");
}
}
