diff --git a/Refactoring/Store.cs b/Refactoring/Store.cs
index d9a7c78..48fcad6 100644
--- a/Refactoring/Store.cs
+++ b/Refactoring/Store.cs
@@ -32,7 +32,7 @@ public void Purchase(string productId, int quantity)
                 throw new OutOfStockException();
             }
 
-            product.Quantity = product.Quantity - quantity+1;
+            product.Quantity = product.Quantity - quantity;
             user.Balance = user.Balance - product.Price * quantity;
 
             dataManager.SaveUser(user);
diff --git a/UnitTestProject/IntegrationTests.cs b/UnitTestProject/IntegrationTests.cs
index f526b8a..ddb4fb9 100644
--- a/UnitTestProject/IntegrationTests.cs
+++ b/UnitTestProject/IntegrationTests.cs
@@ -10,7 +10,7 @@
 namespace UnitTestProject
 {
     [TestFixture]
-    //[Ignore("Disable integration tests")]
+    [Ignore("Disable integration tests")]
     public class IntegrationTests
     {
         private List<User> users;
diff --git a/UnitTestProject/StoreTests.cs b/UnitTestProject/StoreTests.cs
index 9f0b866..91ae8af 100644
--- a/UnitTestProject/StoreTests.cs
+++ b/UnitTestProject/StoreTests.cs
@@ -60,36 +60,94 @@ public void Test_PurchaseThrowsNoErrorForValidFunds()
         public void Test_PurchaseRemovesProductFromStore()
         {
             //Arrange
+            const string TEST_PRODUCT_ID = "1";
+
+            var users = new List<User>();
+            users.Add(createTestUser("Test User", "", 99.99));
+
+            var products = new List<Product>();
+            products.Add(createTestProduct(TEST_PRODUCT_ID, "Product", 9.99, 10));
+
+            var dataManager = new DataManager(users, products);
+            var store = new Store(users[0], dataManager);
 
             //Act
+            store.Purchase(TEST_PRODUCT_ID, 9);
+
 
             //Assert 
             //(choose the appropriate statement(s))
             //Assert.AreEqual(1, products[0].Quantity);
             //Assert.AreSame(1, products[0].Quantity);
-            //Assert.IsTrue(products[0].Quantity == 1);
+            Assert.IsTrue(products[0].Quantity == 1);
         }
 
         [Test]
         public void Test_PurchaseThrowsExceptionWhenBalanceIsTooLow()
         {
             //Arrange
+            const string TEST_PRODUCT_ID = "1";
+
+            var users = new List<User>();
+            users.Add(createTestUser("Test User", "", 1.00));
+
+            var products = new List<Product>();
+            products.Add(createTestProduct(TEST_PRODUCT_ID, "Product", 1.01, 10));
+
+            var dataManager = new DataManager(users, products);
+            var store = new Store(users[0], dataManager);
 
             //Act
+            store.Purchase(TEST_PRODUCT_ID, 1);
 
             //Assert
+            Assert.GreaterOrEqual(users[0].Balance, products[0].Price);
         }
 
         [Test]
         public void Test_PurchaseThrowsExceptionWhenBalanceIsTooLowVersion2()
         {
             //Arrange
+            const string TEST_PRODUCT_ID = "1";
+
+            var users = new List<User>();
+            users.Add(createTestUser("Test User", "", 1.00));
+
+            var products = new List<Product>();
+            products.Add(createTestProduct(TEST_PRODUCT_ID, "Product", 1.01, 10));
+
+            var dataManager = new DataManager(users, products);
+            var store = new Store(users[0], dataManager);
 
             //Act
+            store.Purchase(TEST_PRODUCT_ID, 1);
 
             //Assert
+            Assert.LessOrEqual(products[0].Price, users[0].Balance);
         }
 
+        [Test]
+        public void Test_PurchaseThrowsExceptionWhenProductOutOfStock()
+        {
+            //Arrange
+            const string TEST_PRODUCT_ID = "1";
+            const int qt = 2;
+
+            var users = new List<User>();
+            users.Add(createTestUser("Test User", "", 100.00));
+
+            var products = new List<Product>();
+            products.Add(createTestProduct(TEST_PRODUCT_ID, "Product", 1.00, 1));
+
+            var dataManager = new DataManager(users, products);
+            var store = new Store(users[0], dataManager);
+
+            //Act
+            store.Purchase(TEST_PRODUCT_ID, qt);
+
+            //Assert
+            Assert.GreaterOrEqual(products[0].Quantity,qt);
+        }
 
         // THE BELOW CODE IS REQUIRED TO PREVENT THE TESTS FROM MODIFYING THE USERS/PRODUCTS ON FILE
         //  This is not a good unit testing pattern - the unit test dependency on the file system should