public void RetrieveAllShopsTest()
        {
            // Arrange.

            // Create the list of shop test data.
            List <Shop> shops = new List <Shop>();

            shops.Add(new Shop()
            {
                ShopID = 100000, RoomID = 245213, Name = "Awesome Pawesome", Description = "Pet Store", Active = true
            });
            shops.Add(new Shop()
            {
                ShopID = 100001, RoomID = 245255, Name = "Club Fun", Description = "Party Supplies", Active = true
            });
            shops.Add(new Shop()
            {
                ShopID = 100002, RoomID = 245620, Name = "Groceries R Us", Description = "Self Explanatory", Active = true
            });
            shops.Add(new Shop()
            {
                ShopID = 100003, RoomID = 205313, Name = "Peppers", Description = "Hot Sauce Shop in Key West", Active = true
            });
            shops.Add(new Shop()
            {
                ShopID = 100004, RoomID = 252113, Name = "Jitters", Description = "Coffee served by Tweek", Active = true
            });

            // Add those shops into the database.
            foreach (var shop in shops)
            {
                _shopManager.InsertShop(shop);
            }

            // Act.

            // Retrieve the shops from the database.
            List <Shop> retrievedShops = (List <Shop>)_shopManager.RetrieveAllShops();

            // Assert.

            // Make sure the shops we created and added to the database were retrieved properly.
            CollectionAssert.AreEqual(shops, retrievedShops);
        }