Builds a URI to retrieve an item from Nutritionix
Inheritance: NutritionixUri
        public void ToString_ContainsItemId()
        {
            var uri = new RetrieveItemUri("myId", "myKey", "itemId");
            var result = uri.ToString();

            Assert.IsTrue(result.Contains("item/itemId"));
        }
        public void ToString_ContainsUPC()
        {
            var uri = new RetrieveItemUri("myId", "myKey", upc: "myUPC");

            string result = uri.ToString();

            StringAssert.Contains("upc=myUPC", result);
        }
        public void ToString_ContainsItemId()
        {
            var uri = new RetrieveItemUri("myId", "myKey", "itemId");

            string result = uri.ToString();

            StringAssert.Contains("id=itemId", result);
        }