public void Can_Indicate_Invalid_Action()
{
const string NOT_THE_DESCRIPTION = "flour";
const string INITIAL_DESCRIPTION = "sugar";
const string NEW_DERSCRIPTION = "brown sugar";
Pantry pantry = new Pantry();
Item notTheItem = new Item() { Description = NOT_THE_DESCRIPTION };
pantry.AddItem(notTheItem);
Assert.IsFalse(pantry.Items.Any(i => i.Description == INITIAL_DESCRIPTION), "PRECONDITION ASSERT FAILURE: cannot enforce needed pre-test condition re: collection members!");
Assert.IsFalse(pantry.Items.Any(i => i.Description == NEW_DERSCRIPTION), "PRECONDITION ASSERT FAILURE: cannot enforce needed pre-test condition re: collection members!");
Assert.IsFalse(pantry.TryUpdateItemDescription(INITIAL_DESCRIPTION, NEW_DERSCRIPTION));
}
public void Can_Change_Item_Description()
{
const string ITEM_TO_RENAME = "sugar";
const string ITEM_NOT_TO_RENAME = "flour";
const string NEW_NAME = "brown sugar";
Pantry pantry = new Pantry();
Item theItem = new Item() { Description = ITEM_TO_RENAME };
Item notTheItem = new Item() { Description = ITEM_NOT_TO_RENAME };
pantry.AddItem(theItem);
pantry.AddItem(notTheItem);
Assert.IsFalse(pantry.Items.Any(i => i.Description == NEW_NAME), "PRECONDITION ASSERT FAILURE: Items collection should not contain item with the new item name!");
Assert.IsTrue(pantry.TryUpdateItemDescription(ITEM_TO_RENAME, NEW_NAME));
Assert.IsTrue(pantry.Items.Any(i => i.Description == NEW_NAME));
}
public void Can_Prevent_Name_Collisions()
{
const string INITIAL_DESCRIPTION = "sugar";
const string NEW_DESCRIPTION = "brown sugar";
Pantry pantry = new Pantry();
Item sugar = new Item() { Description = INITIAL_DESCRIPTION };
Item brownSugar = new Item() { Description = NEW_DESCRIPTION };
pantry.AddItem(sugar);
pantry.AddItem(brownSugar);
Assert.IsFalse(pantry.TryUpdateItemDescription(NEW_DESCRIPTION, INITIAL_DESCRIPTION));
}