DesignPattern-Sajid

DesignPatternsSolution/Execise.Tests/UnitTests.cs

@@ -10,20 +10,30 @@ public class UnitTests
         [TestMethod]
         public void LibraryShouldBeSingleton()
         {
-            //check that when you create a Library instance second time, 
-            //you get exactly the same instance as for a very first time
+            var libraryInstance1 = Library.GetInstance();
+            var libraryInstance2 = Library.GetInstance();
+
+            Assert.AreSame(libraryInstance1, libraryInstance2);
         }
 
         //test that an book was registered successfully by checking the returned Id value is not -1
         [TestMethod]
         public void BookShouldRegister()
         {
+            var book = new Book("Jason Mark","Clean Code",1997,25);
+            var response = RegistrationRepository.Register(book);
+
+            Assert.IsTrue(response > -1);
         }
 
         //test that an customer was registered successfully by checking the returned Id value is not -1
         [TestMethod]
         public void CustomerShouldRegister()
         {
+            var customer = new Customer("Jason Mark","386 Broadway");
+            var response = RegistrationRepository.Register(customer);
+
+            Assert.IsTrue(response > -1);
         }
 
         //test that a book can be borrowed
@@ -32,7 +42,13 @@ public void CanBorrowBook()
         {
             //create a borrowable book with available amount more than one. 
             //Run BorrowOne method of the BookBorrowable instance. Check that total amount was reduced by one.
-
+            int bookInInventory = 25;
+            var book = new Book("Jason Mark", "Clean Code", 1997, bookInInventory);
+            var borrowable = new BookBorrowable(book);
+
+            borrowable.BorrowBook();
+            Assert.IsTrue(book.AvailableAmount == bookInInventory - 1);
+
         }       
     }
 }

DesignPatternsSolution/Exercise/BookBorrowable.cs

@@ -1,7 +1,23 @@
 namespace Exercise
 {
-    public class BookBorrowable 
+    public class BookBorrowable : Book
     {
-
+        private Book Book { get; set; }
+
+        public BookBorrowable(Book canBorrow) : base(canBorrow.Author, canBorrow.NameOrTitle, canBorrow.YearCreated, canBorrow.AvailableAmount)
+        {
+            Book = canBorrow;
+        }
+
+        public bool BorrowBook()
+        {
+            if (Book.AvailableAmount > 0)
+            {
+                Book.AvailableAmount--;
+                return true;
+            }
+
+            return false;
+        }
     }
 }

DesignPatternsSolution/Exercise/LibObject.cs

@@ -1,12 +1,22 @@
 namespace Exercise
 {
-    public abstract class LibObject
+    public abstract class LibObject : IRegistarable
     {
         public int ObjectId { get; set; }
         public int AvailableAmount { get; set; }
         public string NameOrTitle { get; set; }
         public ObjectType ObjType { get; set; }
         public int YearCreated { get; set; }
+
+        public RegisteredObject GetRegistrationInfo()
+        {
+            return new RegisteredObject
+            {
+                AvailableAmount = AvailableAmount,
+                Id = ObjectId,
+                Info = NameOrTitle
+            };
+        }
     }
 
     public enum ObjectType

DesignPatternsSolution/Exercise/Library.cs

@@ -3,8 +3,15 @@
     public class Library
     {
         //implement Singleton to make sure only one library will exist
+        private static Library Instance { get; set; }
 
-
+
+        private Library() { Instance = new Library(); } 
+
+        public static Library GetInstance()
+        {
+            return Instance;
+        }
 
         //Implement Register method by utilizing RegistrationRepository (complete missing parts)
         public int Register()