From b403002c06420094a42f28a687480d65720a27e5 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Fri, 17 Jul 2026 19:28:33 +0000
Subject: [PATCH] Add tests for Mutate<T> struct extension

Co-authored-by: johnstrand <11484777+johnstrand@users.noreply.github.com>
---
 .../Extensions/ObjectExtensionsTests.cs       | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 tests/GameUtils.Tests/Extensions/ObjectExtensionsTests.cs

diff --git a/tests/GameUtils.Tests/Extensions/ObjectExtensionsTests.cs b/tests/GameUtils.Tests/Extensions/ObjectExtensionsTests.cs
new file mode 100644
index 0000000..7d03212
--- /dev/null
+++ b/tests/GameUtils.Tests/Extensions/ObjectExtensionsTests.cs
@@ -0,0 +1,25 @@
+using System;
+using GameUtils.Extensions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace GameUtils.Tests.Extensions;
+
+[TestClass]
+public class ObjectExtensionsTests
+{
+    [TestMethod]
+    public void Mutate_Struct_ReturnsMutatedValue()
+    {
+        int value = 5;
+        int result = value.Mutate(x => x + 5);
+        Assert.AreEqual(10, result);
+    }
+
+    [TestMethod]
+    public void Mutate_Struct_NullAction_ThrowsArgumentNullException()
+    {
+        int value = 5;
+        Func<int, int> action = null!;
+        Assert.ThrowsExactly<ArgumentNullException>(() => value.Mutate(action));
+    }
+}