Add UTF-8 vs ASCII tests

Author: ResurrectedTrader

src/D2SSharp.Tests/OverlayTests.cs

@@ -1,3 +1,4 @@
+using System.Text;
 using D2SSharp.Model;
 using Xunit;
 
@@ -164,6 +165,53 @@ public void Overlay_NameProperty(string resourcePath)
         Assert.True(D2Save.VerifyChecksum(data));
     }
 
+    [Fact]
+    public void Overlay_NameSetter_ImmediateReadback_UTF8()
+    {
+        var data = File.ReadAllBytes("Resources/99/Soska.d2s");
+        ref var layout = ref D2SaveLayout.From(data);
+
+        var newName = "Ahą闱";
+
+        // Set the name
+        layout.Name = newName;
+
+        // Immediately read back - should show new value
+        Assert.Equal(newName, layout.Name);
+
+        // Also verify the underlying bytes changed
+        var nameBytes = Encoding.UTF8.GetBytes(layout.Name);
+        var expectedBytes = Encoding.UTF8.GetBytes(newName);
+        Assert.Equal(expectedBytes, nameBytes);
+
+        var save = D2Save.Read(data);
+        var saveNameBytes = Encoding.UTF8.GetBytes(save.Character.Preview.Name);
+        Assert.Equal(newName, save.Character.Preview.Name);
+        Assert.Equal(expectedBytes, saveNameBytes);
+    }
+
+    [Fact]
+    public void Overlay_NameSetter_ImmediateReadback_ASCII()
+    {
+        var data = File.ReadAllBytes("Resources/96/Soska.d2s");
+        ref var layout = ref D2SaveLayout.From(data);
+
+        var newName = "Ahą闱";
+
+        // Set the name
+        layout.Name = newName;
+
+        // Immediately read back - should show new value
+        Assert.NotEqual(newName, layout.Name);
+
+        var expectedBytes = Encoding.UTF8.GetBytes(newName);
+
+        var save = D2Save.Read(data);
+        var saveNameBytes = Encoding.UTF8.GetBytes(save.Character.Name);
+        Assert.NotEqual(newName, save.Character.Preview.Name);
+        Assert.NotEqual(expectedBytes, saveNameBytes);
+    }
+
     [Theory]
     [InlineData("Resources/97/Amazon.d2s")]
     public void Overlay_UnlockAllWaypointsAndVerify(string resourcePath)