public void DoesAddItemActuallyIncreaseCountOfItems()
{
// Arrange
Catering catering = new Catering();
CateringItem newItem = new CateringItem("B1", "Soda", 1.50M, "B");
// Act
catering.Add(newItem);
System.Collections.Generic.List <CateringItem> cateringItems = catering.AllCateringItems;
//Assert
Assert.AreEqual(1, cateringItems.Count);
}