From 984b19c07ac7634ef5c3413ef07df75c2ffea504 Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Sat, 10 Jan 2026 22:31:10 +0000
Subject: [PATCH 1/2] chore: add .worktrees/ to gitignore

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .gitignore | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index c7af869a73..dd1360bb1a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -435,4 +435,7 @@ doc/plans/
 *speedscope*.json
 
 # Dotnet trace files
-*.nettrace
\ No newline at end of file
+*.nettrace
+
+# Git worktrees
+.worktrees/
\ No newline at end of file

From 974dacd41eff3433c2fc09be0944e320145f0d01 Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Sat, 10 Jan 2026 22:38:22 +0000
Subject: [PATCH 2/2] perf: cache CreateExecutableTestFactory delegate

Cache the factory delegate instead of creating new lambdas on every
property access. This avoids repeated allocations in the hot path
during test execution.

Fixes #4281

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 TUnit.Core/TestMetadata`1.cs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/TUnit.Core/TestMetadata`1.cs b/TUnit.Core/TestMetadata`1.cs
index c29cc86c20..b759c25bf8 100644
--- a/TUnit.Core/TestMetadata`1.cs
+++ b/TUnit.Core/TestMetadata`1.cs
@@ -14,6 +14,7 @@ public class TestMetadata<
 {
     private Func<Type[], object?[], T>? _instanceFactory;
     private Func<T, object?[], Task>? _testInvoker;
+    private Func<ExecutableTestCreationContext, TestMetadata, AbstractExecutableTest>? _cachedExecutableTestFactory;
 
     /// <summary>
     /// Strongly typed instance factory
@@ -63,10 +64,16 @@ public override Func<ExecutableTestCreationContext, TestMetadata, AbstractExecut
     {
         get
         {
+            // Return cached factory if available
+            if (_cachedExecutableTestFactory != null)
+            {
+                return _cachedExecutableTestFactory;
+            }
+
             // For AOT mode, create delegates from the strongly-typed ones
             if (InstanceFactory != null && InvokeTypedTest != null)
             {
-                return (context, metadata) =>
+                _cachedExecutableTestFactory = (context, metadata) =>
                 {
                     var typedMetadata = (TestMetadata<T>)metadata;
 
@@ -109,6 +116,8 @@ public override Func<ExecutableTestCreationContext, TestMetadata, AbstractExecut
                         Context = context.Context
                     };
                 };
+
+                return _cachedExecutableTestFactory;
             }
 
             throw new InvalidOperationException($"InstanceFactory and InvokeTypedTest must be set for {typeof(T).Name}");