diff --git a/test/DotRecast.Core.Test/RcIoTests.cs b/test/DotRecast.Core.Test/RcIoTests.cs
new file mode 100644
index 0000000..c54d50b
--- /dev/null
+++ b/test/DotRecast.Core.Test/RcIoTests.cs
@@ -0,0 +1,38 @@
+using System;
+using System.IO;
+using NUnit.Framework;
+
+namespace DotRecast.Core.Test;
+
+public class RcIoTests
+{
+    [Test]
+    public void Test()
+    {
+        const long tileRef = 281474976710656L;
+        const int dataSize = 344;
+        
+        byte[] actual;
+        
+        {
+            using MemoryStream ms = new MemoryStream();
+            using BinaryWriter bw = new BinaryWriter(ms);
+
+            RcIO.Write(bw, tileRef, RcByteOrder.LITTLE_ENDIAN);
+            RcIO.Write(bw, dataSize, RcByteOrder.LITTLE_ENDIAN);
+
+            bw.Flush();
+            actual= ms.ToArray();
+        }
+
+        {
+            using MemoryStream ms = new MemoryStream(actual);
+            using BinaryReader br = new BinaryReader(ms);
+            var byteBuffer = RcIO.ToByteBuffer(br);
+            byteBuffer.Order(RcByteOrder.LITTLE_ENDIAN);
+
+            Assert.That(byteBuffer.GetLong(), Is.EqualTo(tileRef));
+            Assert.That(byteBuffer.GetInt(), Is.EqualTo(dataSize));
+        }
+    }
+}
\ No newline at end of file