From 88a28ea8044a6ef0cf9a5a38677b3c9970f40548 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Sat, 20 Jun 2026 19:08:17 +0000
Subject: [PATCH] test: add coverage for ArenaUtf8String.DecodeTo

Co-authored-by: myarichuk <1473701+myarichuk@users.noreply.github.com>
---
 .../Collections/ArenaUtfStringTests.cs        | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tests/SharpArena.Tests/Collections/ArenaUtfStringTests.cs b/tests/SharpArena.Tests/Collections/ArenaUtfStringTests.cs
index 033733b..bc7ab37 100644
--- a/tests/SharpArena.Tests/Collections/ArenaUtfStringTests.cs
+++ b/tests/SharpArena.Tests/Collections/ArenaUtfStringTests.cs
@@ -47,6 +47,34 @@ public void ArenaUtf16String_ToUtf8_EncodesCorrectly()
         utf8.Length.Should().Be(System.Text.Encoding.UTF8.GetByteCount(text));
     }
 
+    [Fact]
+    public void ArenaUtf8String_DecodeTo_DecodesCorrectly()
+    {
+        var text = "Hello DecodeTo!";
+        var bytes = System.Text.Encoding.UTF8.GetBytes(text);
+        var utf8String = ArenaUtf8String.Clone(bytes, _arena);
+
+        var destination = new char[text.Length];
+        var decodedLength = utf8String.DecodeTo(destination);
+
+        decodedLength.Should().Be(text.Length);
+        new string(destination).Should().Be(text);
+    }
+
+    [Fact]
+    public void ArenaUtf8String_DecodeTo_WithEmojis()
+    {
+        var text = "Hello DecodeTo! 😊";
+        var bytes = System.Text.Encoding.UTF8.GetBytes(text);
+        var utf8String = ArenaUtf8String.Clone(bytes, _arena);
+
+        var destination = new char[text.Length];
+        var decodedLength = utf8String.DecodeTo(destination);
+
+        decodedLength.Should().Be(text.Length);
+        new string(destination).Should().Be(text);
+    }
+
     [Fact]
     public void ArenaUtf8String_GetHashCode_IsContentBased()
     {