Add a few simple tests

Ensure the struct sizes are correct

src/Ryujinx.HLE/HOS/Services/Sockets/Bsd/Impl/ManagedProxySocket.cs

@@ -304,7 +304,7 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Bsd.Impl
             _udpEndpoint = new IPEndPoint(response.BoundAddress, response.BoundPort);
             _udpSocket = new Socket(AddressFamily, SocketType, ProtocolType)
             {
-                Blocking = Socket.Blocking
+                Blocking = Socket.Blocking,
             };
             _udpSocket.Bind(endpoint);
 

src/Ryujinx.Tests/HLE/HOS/Services/Sockets/Bsd/Proxy/Auth/AuthMethodTests.cs

@@ -0,0 +1,28 @@
+using NUnit.Framework;
+using Ryujinx.HLE.HOS.Services.Sockets.Bsd.Proxy.Auth;
+using System;
+
+namespace Ryujinx.Tests.HLE.HOS.Services.Sockets.Bsd.Proxy.Auth
+{
+    public class AuthMethodTests
+    {
+        [Test]
+        public void GetAuth_ReturnValue([Values] AuthMethod authMethod)
+        {
+            // TODO: Remove this as soon as we have an implementation for these
+            if (authMethod is AuthMethod.UsernameAndPassword or AuthMethod.GSSAPI)
+            {
+                Assert.Throws<NotImplementedException>(() => authMethod.GetAuth());
+                return;
+            }
+
+            if (authMethod is AuthMethod.NoAcceptableMethods)
+            {
+                Assert.Throws<ArgumentException>(() => authMethod.GetAuth());
+                return;
+            }
+
+            Assert.IsInstanceOf<IProxyAuth>(authMethod.GetAuth());
+        }
+    }
+}

src/Ryujinx.Tests/HLE/HOS/Services/Sockets/Bsd/Proxy/Packets/MethodSelectionTests.cs

@@ -0,0 +1,46 @@
+using NUnit.Framework;
+using Ryujinx.Common.Memory;
+using Ryujinx.HLE.HOS.Services.Sockets.Bsd.Proxy;
+using Ryujinx.HLE.HOS.Services.Sockets.Bsd.Proxy.Auth;
+using Ryujinx.HLE.HOS.Services.Sockets.Bsd.Proxy.Packets;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Tests.HLE.HOS.Services.Sockets.Bsd.Proxy.Packets
+{
+    public class MethodSelectionTests
+    {
+        [Test]
+        public void MethodSelectionRequest1_Size()
+        {
+            // Version: 1 byte
+            // Number of methods: 1 byte
+            // Methods: 1 - 255 bytes (in this case: 1)
+            // Total: 3 bytes
+
+            var request = new MethodSelectionRequest1
+            {
+                Version = ProxyConsts.Version,
+                NumOfMethods = 1,
+                Methods = new Array1<AuthMethod> { [0] = AuthMethod.NoAuthenticationRequired },
+            };
+
+            Assert.AreEqual(3, Marshal.SizeOf(request));
+        }
+
+        [Test]
+        public void MethodSelectionResponse_Size()
+        {
+            // Version: 1 byte
+            // Method: 1 byte
+            // Total: 2 bytes
+
+            var response = new MethodSelectionResponse()
+            {
+                Version = ProxyConsts.Version,
+                Method = AuthMethod.NoAuthenticationRequired,
+            };
+
+            Assert.AreEqual(2, Marshal.SizeOf(response));
+        }
+    }
+}