public void WhenEmptyCartAndAddItemExpectActiveCartWithOneItem()
{
var emptyCart = new CartStateEmpty();
var newState = emptyCart.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(1));
}
public void WhenEmptyCartAndAddItemExpectActiveCartWithOneItem()
{
// arrange
var emptyCart = new CartStateEmpty();
// act
var newState = emptyCart.Add(Product.ProductX);
// assert
var activeState = newState as CartStateActive; //CAST!
if (activeState != null)
{
var itemCount = activeState.Items.Count();
Assert.That(itemCount, Is.EqualTo(1));
}
else
{
Assert.Fail("Expect ActiveState");
}
}