diff --git a/Directory.Packages.props b/Directory.Packages.props
index faaf26b5..0989d4ab 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -19,4 +19,4 @@
     <PackageVersion Include="System.Linq.Async" Version="6.0.1" />
     <PackageVersion Include="System.Reflection" Version="4.3.0" />
   </ItemGroup>
-</Project>
+</Project>
\ No newline at end of file
diff --git a/src/Chapter20.Tests/Listing20.07.Tests.cs b/src/Chapter20.Tests/Listing20.07.Tests.cs
index 1342905a..df8ba904 100644
--- a/src/Chapter20.Tests/Listing20.07.Tests.cs
+++ b/src/Chapter20.Tests/Listing20.07.Tests.cs
@@ -1,14 +1,11 @@
-//using System.Threading.Tasks;
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter20.Listing20_07.Tests;
 
-//namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter20.Listing20_07.Tests
-//{
-//    [TestClass]
-//    public class ProgramTests
-//    {
-//        [TestMethod]
-//        public async Task MainTest()
-//        {
-//            await IntelliTect.TestTools.Console.ConsoleAssert.ExpectAsync("<filename>", async () => await AsyncEncryptionCollection.Main());
-//        }
-//    }
-//}
\ No newline at end of file
+[TestClass]
+public class AsyncEncryptionCollectionTests
+{
+    [TestMethod]
+    public async Task MainDoesNotThrow()
+    {
+        await IntelliTect.TestTools.Console.ConsoleAssert.ExecuteAsync("", async () => await AsyncEncryptionCollection.Main());
+    }
+}
\ No newline at end of file