feat: add Handled Exception self-test step

Dalamud/Interface/Internal/Windows/SelfTest/AgingSteps/HandledExceptionAgingStep.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Dalamud.Interface.Internal.Windows.SelfTest.AgingSteps
+{
+    /// <summary>
+    /// Test dedicated to handling of Access Violations.
+    /// </summary>
+    internal class HandledExceptionAgingStep : IAgingStep
+    {
+        /// <inheritdoc/>
+        public string Name => "Test Handled Exception";
+
+        /// <inheritdoc/>
+        public SelfTestStepResult RunStep(Dalamud dalamud)
+        {
+            try
+            {
+                Marshal.ReadByte(IntPtr.Zero);
+            }
+            catch (AccessViolationException)
+            {
+                return SelfTestStepResult.Pass;
+            }
+
+            return SelfTestStepResult.Fail;
+        }
+
+        /// <inheritdoc/>
+        public void CleanUp(Dalamud dalamud)
+        {
+            // ignored
+        }
+    }
+}

Dalamud/Interface/Internal/Windows/SelfTest/SelfTestWindow.cs

@@ -39,6 +39,7 @@ namespace Dalamud.Interface.Internal.Windows.SelfTest
                 new HoverAgingStep(),
                 new LuminaAgingStep<TerritoryType>(),
                 new PartyFinderAgingStep(),
+                new HandledExceptionAgingStep(),
                 new LogoutEventAgingStep(),
             };