diff --git a/src/ClashOfClans.Tests.Unit/ExtensionsTests.cs b/src/ClashOfClans.Tests.Unit/ExtensionsTests.cs
index 1c9595c..637be80 100644
--- a/src/ClashOfClans.Tests.Unit/ExtensionsTests.cs
+++ b/src/ClashOfClans.Tests.Unit/ExtensionsTests.cs
@@ -5,14 +5,14 @@
 
 namespace ClashOfClans.Models
 {
-    internal class NullableTypes
+    internal sealed class NullableTypes
     {
         public Role? NullableRole { get; set; }
         public Player? NullablePlayer { get; set; }
         public int? NullableTrophies { get; set; }
     }
 
-    internal class NonnullableTypes
+    internal sealed class NonnullableTypes
     {
         private Role? _nonnullableRole;
         private int? _nonnullableTrophies;
diff --git a/src/ClashOfClans.Tests.Unit/TokenValidatorTests.cs b/src/ClashOfClans.Tests.Unit/TokenValidatorTests.cs
index 02a2031..b9218d7 100644
--- a/src/ClashOfClans.Tests.Unit/TokenValidatorTests.cs
+++ b/src/ClashOfClans.Tests.Unit/TokenValidatorTests.cs
@@ -55,7 +55,7 @@ public void ValidTokensPassValidation()
             {
                 TokenValidator.Validate(tokens);
             }
-            catch (Exception)
+            catch (ArgumentException)
             {
                 // Assert
                 Assert.Fail("No exception expected!");