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 WhenActiveCartWithTwoItemsAndRemoveItemExpectActiveCartWithOneItem()
{
var activeCart = new CartStateActive(new[] { Product.ProductX, Product.ProductY });
var newState = activeCart.Remove(Product.ProductY);
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(1));
}
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");
}
}