Update TUnit, warning cleanup

Plugins/PkmnLib.Plugin.Gen7.Tests/Scripts/Abilities/AftermathTests.cs

@@ -1,6 +1,5 @@
 using PkmnLib.Dynamic.Events;
 using PkmnLib.Dynamic.Models;
-using PkmnLib.Dynamic.ScriptHandling;
 using PkmnLib.Plugin.Gen7.Scripts.Abilities;
 using PkmnLib.Static.Species;
 using PkmnLib.Static.Utils;
@@ -333,7 +332,7 @@ public class AftermathTests
         aftermath.OnFaint(target, DamageSource.MoveDamage);
 
         // Assert
-        await Assert.That(GetDamageSource(user)).IsEqualTo(DamageSource.Misc);
+        await Assert.That(GetDamageSource(user)!.Value).IsEqualTo(DamageSource.Misc);
     }
 
     /// <summary>