public void AddCustomPizza_Returns_Data()
{
var pizza = CustomPizza();
pizzaDalMock = new Mock <IPizzaDal>();
pizzaDalMock.Setup(i => i.AddPizza(pizza)).Returns(Guid.NewGuid);
_service = new PizzaService(pizzaDalMock.Object);
// Act
var result = _service.AddPizza(pizza);
// Assert
Assert.NotNull(result);
}