diff --git a/Facepunch.Steamworks.Test/Client/App.cs b/Facepunch.Steamworks.Test/Client/App.cs
new file mode 100644
index 0000000..984e2fb
--- /dev/null
+++ b/Facepunch.Steamworks.Test/Client/App.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Text;
+using System.Threading;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Facepunch.Steamworks.Test
+{
+    [TestClass]
+    [DeploymentItem( "steam_api.dll" )]
+    [DeploymentItem( "steam_api64.dll" )]
+    [DeploymentItem( "steam_appid.txt" )]
+    public class App
+    {
+        [TestMethod]
+        public void IsSubscribed()
+        {
+            using ( var client = new Facepunch.Steamworks.Client( 252490 ) )
+            {
+                Console.WriteLine("This test assumes you own Garry's Mod and not Charles III of Spain and the antiquity");
+
+                Assert.IsTrue( client.App.IsSubscribed( 4000 ) );
+                Assert.IsFalse( client.App.IsSubscribed( 590440 ));
+            }
+        }
+
+        [TestMethod]
+        public void IsInstalled()
+        {
+            using (var client = new Facepunch.Steamworks.Client(252490))
+            {
+                Console.WriteLine("This test assumes you have Garry's Mod installed but not Charles III of Spain and the antiquity");
+
+                Assert.IsTrue(client.App.IsInstalled(4000));
+                Assert.IsFalse(client.App.IsInstalled(590440));
+            }
+        }
+
+        [TestMethod]
+        public void PurchaseTime()
+        {
+            using (var client = new Facepunch.Steamworks.Client(252490))
+            {
+                Console.WriteLine("This test assumes you own Garry's Mod but not Charles III of Spain and the antiquity");
+
+                var gmodBuyTime = client.App.PurchaseTime( 4000 );
+                Assert.AreNotEqual( gmodBuyTime, DateTime.MinValue );
+
+                Console.WriteLine($"You bought Garry's Mod {gmodBuyTime}");
+
+                var otherBuyTime = client.App.PurchaseTime(590440);
+                Assert.AreEqual(otherBuyTime, DateTime.MinValue);
+            }
+        }
+
+    }
+}
diff --git a/Facepunch.Steamworks.Test/Facepunch.Steamworks.Test.csproj b/Facepunch.Steamworks.Test/Facepunch.Steamworks.Test.csproj
index 4eeecf3..8611793 100644
--- a/Facepunch.Steamworks.Test/Facepunch.Steamworks.Test.csproj
+++ b/Facepunch.Steamworks.Test/Facepunch.Steamworks.Test.csproj
@@ -94,6 +94,7 @@
   <ItemGroup>
     <Compile Include="Client\Client.cs" />
     <Compile Include="Client\Leaderboard.cs" />
+    <Compile Include="Client\App.cs" />
     <Compile Include="Client\Voice.cs" />
     <Compile Include="Client\Inventory.cs" />
     <Compile Include="Client\Workshop.cs" />