public void GetAllItems_Test()
{
db.Setup(x => x.Items.GetAll()).Returns(GetAllItems());
List <ItemDTO> act = mapper.Map <List <ItemDTO> >(service.GetAllItems());
var exp = GetAllItems();
Assert.NotNull(act);
Assert.AreEqual(exp[0].ItemId, act[0].ItemId);
Assert.AreEqual(exp[0].ItemName, act[0].ItemName);
Assert.AreEqual(exp[1].Price, act[1].Price);
Assert.AreEqual(exp[1].CategoryId, act[1].CategoryId);
}