public void GetAll_RetrieveAllItems_AllItemsRetrieved()
        {
            // arrange
            InMemoryPackageRepository inmemorypackagerepository = new InMemoryPackageRepository();
            inmemorypackagerepository.Add(new Package(1, "Name", "Adress", "Receiver", "TargetAdress", 1, "City", "Country", "1010", "Street"));
            inmemorypackagerepository.Add(new Package(2, "Name", "Adress", "Receiver", "TargetAdress", 1, "City", "Country", "1010", "Street"));

            // act
            List<Package> packagelist = (List<Package>)inmemorypackagerepository.GetAll();

            // assert
            Assert.AreEqual(packagelist.Count, 2);
        }
        public void Add_Item_AddedItem()
        {
            // arrange
            InMemoryPackageRepository inmemorypackagerepository = new InMemoryPackageRepository();

            // act
            inmemorypackagerepository.Add(new Package(1, "Name", "Adress", "Receiver", "TargetAdress", 1, "City", "Country", "1010", "Street"));

            // assert
            List<Package> packagelist = (List<Package>)inmemorypackagerepository.GetAll();

            Assert.AreEqual(packagelist.Count, 1);
        }