public void TestProductStockStartsWithFiveOfEachItem()
{
ProductStock productStock = new ProductStock();
Assert.AreEqual(5, productStock.Count(Products.Cola));
Assert.AreEqual(5, productStock.Count(Products.Chips));
Assert.AreEqual(5, productStock.Count(Products.Candy));
}
public void TestCreatesADictionaryOfIProductsAndIntsForCandyColaAndChips()
{
ProductStock productStock = new ProductStock();
Dictionary<IProduct, int> stock = productStock.Stock;
Assert.AreEqual(3, stock.Count);
Assert.AreEqual(5, stock[Products.Cola]);
Assert.AreEqual(5, stock[Products.Candy]);
Assert.AreEqual(5, stock[Products.Chips]);
}
public void TestRemovingACandyDecrementsCountForCandyOnly()
{
ProductStock productStock = new ProductStock();
productStock.Remove(Products.Candy);
Assert.AreEqual(4, productStock.Count(Products.Candy));
Assert.AreEqual(5, productStock.Count(Products.Cola));
Assert.AreEqual(5, productStock.Count(Products.Chips));
productStock.Remove(Products.Candy);
Assert.AreEqual(3, productStock.Count(Products.Candy));
Assert.AreEqual(5, productStock.Count(Products.Cola));
Assert.AreEqual(5, productStock.Count(Products.Chips));
}
public void TestCountCantGoBelowZero()
{
ProductStock productStock = new ProductStock();
int originalCountAndMore = productStock.Count(Products.Cola) + 3;
for (int i = 0; i < originalCountAndMore; i++)
{
productStock.Remove(Products.Cola);
Assert.GreaterOrEqual(productStock.Count(Products.Cola), 0);
}
}
public void TestRemovingAProductNotifesAllObservers()
{
ProductStock productStock = new ProductStock();
MockProductStockObserver mockProductStockObserverOne = new MockProductStockObserver();
MockProductStockObserver mockProductStockObserverTwo = new MockProductStockObserver();
productStock.RegisterObserver(mockProductStockObserverOne);
productStock.RegisterObserver(mockProductStockObserverTwo);
productStock.Remove(Products.Cola);
Assert.AreEqual(1, mockProductStockObserverOne.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Cola, mockProductStockObserverOne.LastProductPassedToProductStockUpdated);
Assert.AreEqual(1, mockProductStockObserverTwo.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Cola, mockProductStockObserverTwo.LastProductPassedToProductStockUpdated);
productStock.Remove(Products.Candy);
Assert.AreEqual(2, mockProductStockObserverOne.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Candy, mockProductStockObserverOne.LastProductPassedToProductStockUpdated);
Assert.AreEqual(2, mockProductStockObserverTwo.NumberOfTimesProductStockUpdatedWasCalled);
Assert.AreEqual(Products.Candy, mockProductStockObserverTwo.LastProductPassedToProductStockUpdated);
}
public void TestRegisterObserverAddsObserverToList()
{
ProductStock productStock = new ProductStock();
List<IProductStockObserver> productStockObservers = productStock.Observers;
Assert.AreEqual(0, productStockObservers.Count);
productStock.RegisterObserver(new MockProductStockObserver());
Assert.AreEqual(1, productStockObservers.Count);
}
public void TestHandlesUnknownProductsGracefully()
{
MockProduct mockProduct = new MockProduct();
ProductStock productStock = new ProductStock();
MockProductStockObserver mockProductStockObserver = new MockProductStockObserver();
productStock.RegisterObserver(mockProductStockObserver);
productStock.Remove(mockProduct);
Assert.AreEqual(0, productStock.Count(mockProduct));
Assert.AreEqual(0, mockProductStockObserver.NumberOfTimesProductStockUpdatedWasCalled);
}
