Added Unity project files

Packages/com.vrchat.base/Editor/VRCSDK/VTP/MockNetworkStream.cs

@@ -0,0 +1,57 @@
+using System;
+using System.IO;
+
+namespace VRC.SDKBase.Editor.VTP
+{
+    // A mock for testing VTP code that expects a network stream.
+    public class MockNetworkStream : Stream
+    {
+        // Since with a network stream you can write to the stream and you won't read back what you wrote, we have to use two memory streams to implement that.
+        public MemoryStream incomingStream;
+        public MemoryStream outgoingStream;
+
+        public MockNetworkStream(MemoryStream incomingStream, MemoryStream outgoingStream)
+        {
+            this.incomingStream = incomingStream;
+            this.outgoingStream = outgoingStream;
+        }
+        
+        public override bool CanRead => true;
+        
+        public override bool CanSeek => false;
+        
+        public override bool CanWrite => true;
+        public override long Length => incomingStream.Length;
+        public override long Position { get; set; }
+
+        public override void Flush()
+        {
+            outgoingStream.Flush();
+        }
+        
+        public override int Read(byte[] buffer, int offset, int count)
+        {
+            if (Position < 0 || Position > incomingStream.Length)
+                throw new ArgumentOutOfRangeException(nameof(Position), "Position is out of bounds");
+            incomingStream.Position = Position;
+            int read = incomingStream.Read(buffer, offset, count);
+            Position += read;
+            return read;
+        }
+        
+        public override long Seek(long offset, SeekOrigin origin)
+        {
+            throw new NotSupportedException($"Seek operation is not supported for {nameof(MockNetworkStream)}");
+        }
+        
+        public override void SetLength(long value)
+        {
+            incomingStream.SetLength(value);
+        }
+        
+        public override void Write(byte[] buffer, int offset, int count)
+        {
+            outgoingStream.Write(buffer, offset, count);
+        }
+    }
+}