diff --git a/README.md b/README.md
index 5f01d03..35963c3 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,4 @@
-MockingTutorial
\ No newline at end of file
+# C# Mocking in Unit Testing using Moq
+This repository contains the source code for unit testing in C# Tutorial Series on YouTube. 
+
+https://youtu.be/jkzJwTbcSRg
diff --git a/Tests/ReservationSystemTests.cs b/Tests/ReservationSystemTests.cs
index 6e8fbc4..c5e7396 100644
--- a/Tests/ReservationSystemTests.cs
+++ b/Tests/ReservationSystemTests.cs
@@ -14,22 +14,57 @@ namespace Tests
     public class ReservationSystemTests
     {
         private readonly ReservationSystem reservationSystem;
+        private readonly Mock<IBookingService> bookingServiceMock = new();
 
         public ReservationSystemTests()
         {
+            //reservationSystem = new ReservationSystem(
+            //    new BookingService(new BookingDbContext()));
+
             reservationSystem = new ReservationSystem(
-                new BookingService(new BookingDbContext()));
+               bookingServiceMock.Object);
         }
 
         [Fact]
         public async Task ReserveAsync_Throws_When_No_Rooms_Available()
         {
-            
+            bookingServiceMock
+                .Setup(mock => mock.GetRoomsAsync(10))
+                .ReturnsAsync(Enumerable.Empty<Room>());
+
+            await Assert.ThrowsAsync<NoAvailableRoomsException>(
+                () => reservationSystem.ReserveAsync(10));
         }
 
         [Fact]
         public async Task ReserveAsync_Reserves_The_Available_Room()
         {
+            var reservedRoom = new Room
+            {
+                Beds = 10,
+                IsReserved = true,
+                RoomName = "Room 1"
+            };
+
+            var emptyRoom = new Room
+            {
+                Beds = 10,
+                IsReserved = false,
+                RoomName = "Room 2"
+            };
+
+            bookingServiceMock
+                .Setup(mock => mock.GetRoomsAsync(10))
+                .ReturnsAsync(new[] 
+                {
+                    reservedRoom,
+                    emptyRoom,
+                });
+
+            await reservationSystem.ReserveAsync(10);
+
+            bookingServiceMock
+                .Verify(mock => mock.ReserveRoomAsync(emptyRoom.RoomId), Times.Once());
         }
     }
 }
\ No newline at end of file
diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index fbc6f84..7aed341 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -9,6 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+    <PackageReference Include="Moq" Version="4.18.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>