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 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 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);
}
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));
}