public void DecreaseStock_ThrowsWhenCurrentQuantityIsZero()
{
var iq = 0;
var sp = new StockProduct(p, iq);
Assert.Throws <InvalidOperationException>(() => sp.DecreaseStock(10));
}
public void DecreaseStock_ThrowsWhenCurrentQuantityWouldBeNegativeAfterOperation()
{
var iq = 10;
var sp = new StockProduct(p, iq);
Assert.Throws <InvalidOperationException>(() => sp.DecreaseStock(11));
}
public void DecreaseStock_ReducesStockByQuantity()
{
var iq = 11;
var sp = new StockProduct(p, iq);
sp.DecreaseStock(10);
Assert.Equal(1, sp.Quantity);
}
