Add 3 for 2 on oranges

simon-chester · Nov 26, 2021 · e401f34 · e401f34
1 parent aba4d24
commit e401f34
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Showing 3 changed files with 56 additions and 4 deletions.
diff --git a/ChestersCheckout/ChestersCheckout.ConsoleApp/Program.cs b/ChestersCheckout/ChestersCheckout.ConsoleApp/Program.cs
@@ -27,9 +27,10 @@ private static IHostBuilder CreateHostBuilder(string[] args)
         private static void ConfigureServices(HostBuilderContext builder, IServiceCollection services)
         {
             services.AddScoped<IProductRepositoryService, StaticProductRepositoryService>();
-            services.AddScoped<IEnumerable<IDiscounterService>>(sp => new IDiscounterService[]
-                { new BogofDiscounterService("apple") }
-            );
+            services.AddScoped<IEnumerable<IDiscounterService>>(sp => new IDiscounterService[] { 
+                new BogofDiscounterService("apple"),
+                new ThreeForTwoDiscounterService("orange") 
+            });
             services.AddScoped<BasketBuilderService>();
             services.AddScoped<BasketCostCalculatorService>();
         }

diff --git a/ChestersCheckout/ChestersCheckout.Core.Tests/Services/BasketCostCalculatorServiceTests.cs b/ChestersCheckout/ChestersCheckout.Core.Tests/Services/BasketCostCalculatorServiceTests.cs
@@ -31,7 +31,7 @@ public void CalculateTotalCost_ReturnsCost_GivenBasketWithValidItems()
         [InlineData(2, 135)]
         [InlineData(3, 195)]
         [InlineData(4, 195)]
-        public void CalculateTotalCost_ReturnsDiscountedCost_GivenBasketAndBogofDiscounter(int appleQuantity, int expectedCost)
+        public void CalculateTotalCost_ReturnsDiscountedCost_WhenAppleBogofDiscounter(int appleQuantity, int expectedCost)
         {
             // Arrange
             var service = new BasketCostCalculatorService(new[] { new BogofDiscounterService("apple") });
@@ -46,5 +46,28 @@ public void CalculateTotalCost_ReturnsDiscountedCost_GivenBasketAndBogofDiscount
             // Assert
             Assert.Equal(expectedCost, result);
         }
+
+        [Theory]
+        [InlineData(0, 0)]
+        [InlineData(1, 25)]
+        [InlineData(2, 50)]
+        [InlineData(3, 50)]
+        [InlineData(4, 75)]
+        [InlineData(5, 100)]
+        [InlineData(6, 100)]
+        public void CalculateTotalCost_ReturnsDiscountedCost_WhenThreeForTwoDiscounter(int quantity, int expectedCost)
+        {
+            // Arrange
+            var service = new BasketCostCalculatorService(new[] { new ThreeForTwoDiscounterService("kiwi") });
+
+            // Act
+            var result = service.CalculateTotalCost(new Models.Basket(new Dictionary<string, (int Quantity, int UnitPrice)>
+            {
+                { "kiwi", (quantity, 25) }
+            }));
+
+            // Assert
+            Assert.Equal(expectedCost, result);
+        }
     }
 }
diff --git a/ChestersCheckout/ChestersCheckout.Core/Services/Discounting/ThreeForTwoDiscounterService.cs b/ChestersCheckout/ChestersCheckout.Core/Services/Discounting/ThreeForTwoDiscounterService.cs
@@ -0,0 +1,28 @@
+using ChestersCheckout.Core.Models;
+using ChestersCheckout.Core.Services.Abstractions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ChestersCheckout.Core.Services.Discounting
+{
+    public class ThreeForTwoDiscounterService : IDiscounterService
+    {
+        private readonly string _productName;
+
+        public ThreeForTwoDiscounterService(string productName)
+        {
+            _productName = productName;
+        }
+
+        public int CalculateDiscount(Basket basket)
+        {
+            if (!basket.Items.TryGetValue(_productName, out var item))
+                return 0;
+
+            return item.UnitPrice * (item.Quantity / 3);
+        }
+    }
+}