Adding some StructPacking tests to ensure existing types don't regress

diff --git a/tests/src/Interop/StructPacking/StructPacking.cs b/tests/src/Interop/StructPacking/StructPacking.cs
new file mode 100644 (file)
index 0000000..8871b9a
--- /dev/null
+++ b/tests/src/Interop/StructPacking/StructPacking.cs
@@ -0,0 +1,1608 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+//
+
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
+
+[StructLayout(LayoutKind.Sequential, Pack = 8, Size = 8)]
+struct MyVector64<T> where T : struct { }
+
+[StructLayout(LayoutKind.Sequential, Pack = 16, Size = 16)]
+struct MyVector128<T> where T : struct { }
+
+[StructLayout(LayoutKind.Sequential, Pack = 32, Size = 32)]
+struct MyVector256<T> where T : struct { }
+
+interface ITestStructure
+{
+    int Size { get; }
+    int OffsetOfByte { get; }
+    int OffsetOfValue { get; }
+}
+
+struct DefaultLayoutDefaultPacking<T> : ITestStructure
+{
+    public byte _byte;
+    public T _value;
+
+    public int Size => Unsafe.SizeOf<DefaultLayoutDefaultPacking<T>>();
+    public int OffsetOfByte => Program.OffsetOf(ref this, ref _byte);
+    public int OffsetOfValue => Program.OffsetOf(ref this, ref _value);
+}
+
+[StructLayout(LayoutKind.Sequential)]
+struct SequentialLayoutDefaultPacking<T> : ITestStructure
+{
+    public byte _byte;
+    public T _value;
+
+    public int Size => Unsafe.SizeOf<SequentialLayoutDefaultPacking<T>>();
+    public int OffsetOfByte => Program.OffsetOf(ref this, ref _byte);
+    public int OffsetOfValue => Program.OffsetOf(ref this, ref _value);
+}
+
+[StructLayout(LayoutKind.Sequential, Pack = 1)]
+struct SequentialLayoutMinPacking<T> : ITestStructure
+{
+    public byte _byte;
+    public T _value;
+
+    public int Size => Unsafe.SizeOf<SequentialLayoutMinPacking<T>>();
+    public int OffsetOfByte => Program.OffsetOf(ref this, ref _byte);
+    public int OffsetOfValue => Program.OffsetOf(ref this, ref _value);
+}
+
+[StructLayout(LayoutKind.Sequential, Pack = 128)]
+struct SequentialLayoutMaxPacking<T> : ITestStructure
+{
+    public byte _byte;
+    public T _value;
+
+    public int Size => Unsafe.SizeOf<SequentialLayoutMaxPacking<T>>();
+    public int OffsetOfByte => Program.OffsetOf(ref this, ref _byte);
+    public int OffsetOfValue => Program.OffsetOf(ref this, ref _value);
+}
+
+[StructLayout(LayoutKind.Auto)]
+struct AutoLayoutDefaultPacking<T> : ITestStructure
+{
+    public byte _byte;
+    public T _value;
+
+    public int Size => Unsafe.SizeOf<AutoLayoutDefaultPacking<T>>();
+    public int OffsetOfByte => Program.OffsetOf(ref this, ref _byte);
+    public int OffsetOfValue => Program.OffsetOf(ref this, ref _value);
+}
+
+[StructLayout(LayoutKind.Auto, Pack = 1)]
+struct AutoLayoutMinPacking<T> : ITestStructure
+{
+    public byte _byte;
+    public T _value;
+
+    public int Size => Unsafe.SizeOf<AutoLayoutMinPacking<T>>();
+    public int OffsetOfByte => Program.OffsetOf(ref this, ref _byte);
+    public int OffsetOfValue => Program.OffsetOf(ref this, ref _value);
+}
+
+[StructLayout(LayoutKind.Auto, Pack = 128)]
+struct AutoLayoutMaxPacking<T> : ITestStructure
+{
+    public byte _byte;
+    public T _value;
+
+    public int Size => Unsafe.SizeOf<AutoLayoutMaxPacking<T>>();
+    public int OffsetOfByte => Program.OffsetOf(ref this, ref _byte);
+    public int OffsetOfValue => Program.OffsetOf(ref this, ref _value);
+}
+
+unsafe class Program
+{
+    const int Pass = 100;
+    const int Fail = 0;
+
+    static int Main(string[] args)
+    {
+        bool succeeded = true;
+
+        // Test fundamental data types
+        succeeded &= TestBoolean();
+        succeeded &= TestByte();
+        succeeded &= TestChar();
+        succeeded &= TestDouble();
+        succeeded &= TestInt16();
+        succeeded &= TestInt32();
+        succeeded &= TestInt64();
+        succeeded &= TestIntPtr();
+        succeeded &= TestSByte();
+        succeeded &= TestSingle();
+        succeeded &= TestUInt16();
+        succeeded &= TestUInt32();
+        succeeded &= TestUInt64();
+        succeeded &= TestUIntPtr();
+        succeeded &= TestVector64();
+        succeeded &= TestVector128();
+        succeeded &= TestVector256();
+
+        // Test custom data types with explicit size/packing 
+        succeeded &= TestMyVector64();
+        succeeded &= TestMyVector128();
+        succeeded &= TestMyVector256();
+
+        return succeeded ? Pass : Fail;
+    }
+
+    static bool TestBoolean()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<bool>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<bool>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<bool>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<bool>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<bool>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<bool>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<bool>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        return succeeded;
+    }
+
+    static bool TestByte()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<byte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<byte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<byte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<byte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<byte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<byte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<byte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        return succeeded;
+    }
+
+    static bool TestChar()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<char>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<char>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<char>>(
+            expectedSize: 3,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<char>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<char>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<char>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<char>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        return succeeded;
+    }
+
+    static bool TestDouble()
+    {
+        bool succeeded = true;
+
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) || (RuntimeInformation.OSArchitecture != Architecture.X86))
+        {
+            succeeded &= Test<DefaultLayoutDefaultPacking<double>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<double>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<double>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<double>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            if (Environment.Is64BitProcess)
+            {
+                succeeded &= Test<AutoLayoutDefaultPacking<double>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMinPacking<double>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMaxPacking<double>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+            }
+            else
+            {
+                succeeded &= Test<AutoLayoutDefaultPacking<double>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMinPacking<double>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMaxPacking<double>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+            }
+        }
+        else
+        {
+            // The System V ABI for i386 defines this type as having 4-byte alignment
+
+            succeeded &= Test<DefaultLayoutDefaultPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<double>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutDefaultPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestInt16()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<short>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<short>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<short>>(
+            expectedSize: 3,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<short>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<short>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<short>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<short>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        return succeeded;
+    }
+
+    static bool TestInt32()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<int>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<int>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<int>>(
+            expectedSize: 5,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<int>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<int>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<int>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<int>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        return succeeded;
+    }
+
+    static bool TestInt64()
+    {
+        bool succeeded = true;
+
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) || (RuntimeInformation.OSArchitecture != Architecture.X86))
+        {
+            succeeded &= Test<DefaultLayoutDefaultPacking<long>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<long>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<long>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<long>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            if (Environment.Is64BitProcess)
+            {
+                succeeded &= Test<AutoLayoutDefaultPacking<long>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMinPacking<long>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMaxPacking<long>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+            }
+            else
+            {
+                succeeded &= Test<AutoLayoutDefaultPacking<long>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMinPacking<long>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMaxPacking<long>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+            }
+        }
+        else
+        {
+            // The System V ABI for i386 defines this type as having 4-byte alignment
+
+            succeeded &= Test<DefaultLayoutDefaultPacking<long>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<long>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<long>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<long>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutDefaultPacking<long>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<long>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<long>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestIntPtr()
+    {
+        bool succeeded = true;
+
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<DefaultLayoutDefaultPacking<IntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<IntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<IntPtr>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<IntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutDefaultPacking<IntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 8,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<IntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 8,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<IntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 8,
+                expectedOffsetValue: 0
+            );
+        }
+        else
+        {
+            succeeded &= Test<DefaultLayoutDefaultPacking<IntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<IntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<IntPtr>>(
+                expectedSize: 5,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<IntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutDefaultPacking<IntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 4,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<IntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 4,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<IntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 4,
+                expectedOffsetValue: 0
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestSByte()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<sbyte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<sbyte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<sbyte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<sbyte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<sbyte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<sbyte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<sbyte>>(
+            expectedSize: 2,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        return succeeded;
+    }
+
+    static bool TestSingle()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<float>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<float>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<float>>(
+            expectedSize: 5,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<float>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<float>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<float>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<float>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        return succeeded;
+    }
+
+    static bool TestUInt16()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<ushort>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<ushort>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<ushort>>(
+            expectedSize: 3,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<ushort>>(
+            expectedSize: 4,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 2
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<ushort>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<ushort>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<ushort>>(
+            expectedSize: 4,
+            expectedOffsetByte: 2,
+            expectedOffsetValue: 0
+        );
+
+        return succeeded;
+    }
+
+    static bool TestUInt32()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<uint>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<uint>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<uint>>(
+            expectedSize: 5,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<uint>>(
+            expectedSize: 8,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 4
+        );
+
+        succeeded &= Test<AutoLayoutDefaultPacking<uint>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMinPacking<uint>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        succeeded &= Test<AutoLayoutMaxPacking<uint>>(
+            expectedSize: 8,
+            expectedOffsetByte: 4,
+            expectedOffsetValue: 0
+        );
+
+        return succeeded;
+    }
+
+    static bool TestUInt64()
+    {
+        bool succeeded = true;
+
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) || (RuntimeInformation.OSArchitecture != Architecture.X86))
+        {
+            succeeded &= Test<DefaultLayoutDefaultPacking<double>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<double>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<double>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<double>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            if (Environment.Is64BitProcess)
+            {
+                succeeded &= Test<AutoLayoutDefaultPacking<double>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMinPacking<double>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMaxPacking<double>>(
+                    expectedSize: 16,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+            }
+            else
+            {
+                succeeded &= Test<AutoLayoutDefaultPacking<double>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMinPacking<double>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+
+                succeeded &= Test<AutoLayoutMaxPacking<double>>(
+                    expectedSize: 12,
+                    expectedOffsetByte: 8,
+                    expectedOffsetValue: 0
+                );
+            }
+        }
+        else
+        {
+            // The System V ABI for i386 defines this type as having 4-byte alignment
+
+            succeeded &= Test<DefaultLayoutDefaultPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<double>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutDefaultPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<double>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestUIntPtr()
+    {
+        bool succeeded = true;
+
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<DefaultLayoutDefaultPacking<UIntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<UIntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<UIntPtr>>(
+                expectedSize: 9,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<UIntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutDefaultPacking<UIntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 8,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<UIntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 8,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<UIntPtr>>(
+                expectedSize: 16,
+                expectedOffsetByte: 8,
+                expectedOffsetValue: 0
+            );
+        }
+        else
+        {
+            succeeded &= Test<DefaultLayoutDefaultPacking<UIntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutDefaultPacking<UIntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<SequentialLayoutMinPacking<UIntPtr>>(
+                expectedSize: 5,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 1
+            );
+
+            succeeded &= Test<SequentialLayoutMaxPacking<UIntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutDefaultPacking<UIntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 4,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<UIntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 4,
+                expectedOffsetValue: 0
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<UIntPtr>>(
+                expectedSize: 8,
+                expectedOffsetByte: 4,
+                expectedOffsetValue: 0
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestVector64()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<Vector64<byte>>>(
+            expectedSize: 16,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+        
+        succeeded &= Test<SequentialLayoutDefaultPacking<Vector64<byte>>>(
+            expectedSize: 16,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+        
+        succeeded &= Test<SequentialLayoutMinPacking<Vector64<byte>>>(
+            expectedSize: 9,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+        
+        succeeded &= Test<SequentialLayoutMaxPacking<Vector64<byte>>>(
+            expectedSize: 16,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+        
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<Vector64<byte>>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        
+            succeeded &= Test<AutoLayoutMinPacking<Vector64<byte>>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        
+            succeeded &= Test<AutoLayoutMaxPacking<Vector64<byte>>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        }
+        else
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<Vector64<byte>>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        
+            succeeded &= Test<AutoLayoutMinPacking<Vector64<byte>>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        
+            succeeded &= Test<AutoLayoutMaxPacking<Vector64<byte>>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestVector128()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<Vector128<byte>>>(
+            expectedSize: 24,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<Vector128<byte>>>(
+            expectedSize: 24,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<Vector128<byte>>>(
+            expectedSize: 17,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<Vector128<byte>>>(
+            expectedSize: 24,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<Vector128<byte>>>(
+                expectedSize: 24,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<Vector128<byte>>>(
+                expectedSize: 24,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<Vector128<byte>>>(
+                expectedSize: 24,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        }
+        else
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<Vector128<byte>>>(
+                expectedSize: 20,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<Vector128<byte>>>(
+                expectedSize: 20,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<Vector128<byte>>>(
+                expectedSize: 20,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestVector256()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<Vector256<byte>>>(
+            expectedSize: 40,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<Vector256<byte>>>(
+            expectedSize: 40,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<Vector256<byte>>>(
+            expectedSize: 33,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<Vector256<byte>>>(
+            expectedSize: 40,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 8
+        );
+
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<Vector256<byte>>>(
+                expectedSize: 40,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<Vector256<byte>>>(
+                expectedSize: 40,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<Vector256<byte>>>(
+                expectedSize: 40,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        }
+        else
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<Vector256<byte>>>(
+                expectedSize: 36,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<Vector256<byte>>>(
+                expectedSize: 36,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<Vector256<byte>>>(
+                expectedSize: 36,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestMyVector64()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<MyVector64<byte>>>(
+            expectedSize: 9,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+        
+        succeeded &= Test<SequentialLayoutDefaultPacking<MyVector64<byte>>>(
+            expectedSize: 9,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+        
+        succeeded &= Test<SequentialLayoutMinPacking<MyVector64<byte>>>(
+            expectedSize: 9,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+        
+        succeeded &= Test<SequentialLayoutMaxPacking<MyVector64<byte>>>(
+            expectedSize: 9,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+        
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<MyVector64<byte>>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        
+            succeeded &= Test<AutoLayoutMinPacking<MyVector64<byte>>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        
+            succeeded &= Test<AutoLayoutMaxPacking<MyVector64<byte>>>(
+                expectedSize: 16,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        }
+        else
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<MyVector64<byte>>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        
+            succeeded &= Test<AutoLayoutMinPacking<MyVector64<byte>>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        
+            succeeded &= Test<AutoLayoutMaxPacking<MyVector64<byte>>>(
+                expectedSize: 12,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestMyVector128()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<MyVector128<byte>>>(
+            expectedSize: 17,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<MyVector128<byte>>>(
+            expectedSize: 17,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<MyVector128<byte>>>(
+            expectedSize: 17,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<MyVector128<byte>>>(
+            expectedSize: 17,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<MyVector128<byte>>>(
+                expectedSize: 24,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<MyVector128<byte>>>(
+                expectedSize: 24,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<MyVector128<byte>>>(
+                expectedSize: 24,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        }
+        else
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<MyVector128<byte>>>(
+                expectedSize: 20,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<MyVector128<byte>>>(
+                expectedSize: 20,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<MyVector128<byte>>>(
+                expectedSize: 20,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool TestMyVector256()
+    {
+        bool succeeded = true;
+
+        succeeded &= Test<DefaultLayoutDefaultPacking<MyVector256<byte>>>(
+            expectedSize: 33,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutDefaultPacking<MyVector256<byte>>>(
+            expectedSize: 33,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMinPacking<MyVector256<byte>>>(
+            expectedSize: 33,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        succeeded &= Test<SequentialLayoutMaxPacking<MyVector256<byte>>>(
+            expectedSize: 33,
+            expectedOffsetByte: 0,
+            expectedOffsetValue: 1
+        );
+
+        if (Environment.Is64BitProcess)
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<MyVector256<byte>>>(
+                expectedSize: 40,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<MyVector256<byte>>>(
+                expectedSize: 40,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<MyVector256<byte>>>(
+                expectedSize: 40,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 8
+            );
+        }
+        else
+        {
+            succeeded &= Test<AutoLayoutDefaultPacking<MyVector256<byte>>>(
+                expectedSize: 36,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMinPacking<MyVector256<byte>>>(
+                expectedSize: 36,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+
+            succeeded &= Test<AutoLayoutMaxPacking<MyVector256<byte>>>(
+                expectedSize: 36,
+                expectedOffsetByte: 0,
+                expectedOffsetValue: 4
+            );
+        }
+
+        return succeeded;
+    }
+
+    static bool Test<T>(int expectedSize, int expectedOffsetByte, int expectedOffsetValue) where T : ITestStructure
+    {
+        bool succeeded = true;
+        var testStructure = default(T);
+
+        int size = testStructure.Size;
+        if (size != expectedSize)
+        {
+            Console.WriteLine($"Unexpected Size for {testStructure.GetType()}.");
+            Console.WriteLine($"     Expected: {expectedSize}; Actual: {size}");
+            succeeded = false;
+        }
+
+        int offsetByte = testStructure.OffsetOfByte;
+        if (offsetByte != expectedOffsetByte)
+        {
+            Console.WriteLine($"Unexpected Offset for {testStructure.GetType()}.Byte.");
+            Console.WriteLine($"     Expected: {expectedOffsetByte}; Actual: {offsetByte}");
+            succeeded = false;
+        }
+
+        int offsetValue = testStructure.OffsetOfValue;
+        if (offsetValue != expectedOffsetValue)
+        {
+            Console.WriteLine($"Unexpected Offset for {testStructure.GetType()}.Value.");
+            Console.WriteLine($"     Expected: {expectedOffsetValue}; Actual: {offsetValue}");
+            succeeded = false;
+        }
+
+        if (!succeeded)
+        {
+            Console.WriteLine();
+        }
+
+        return succeeded;
+    }
+
+    internal static int OffsetOf<T, U>(ref T origin, ref U target)
+    {
+        return Unsafe.ByteOffset(ref origin, ref Unsafe.As<U, T>(ref target)).ToInt32();
+    }
+}

diff --git a/tests/src/Interop/StructPacking/StructPacking.csproj b/tests/src/Interop/StructPacking/StructPacking.csproj
new file mode 100644 (file)
index 0000000..bd98338
--- /dev/null
+++ b/tests/src/Interop/StructPacking/StructPacking.csproj
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{95DFC527-4DC1-495E-97D7-E94EE1F7140D}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <!-- Default configurations to help VS understand the configurations -->
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "></PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' " />
+  <ItemGroup>
+    <CodeAnalysisDependentAssemblyPaths Condition=" '$(VS100COMNTOOLS)' != '' " Include="$(VS100COMNTOOLS)..\IDE\PrivateAssemblies">
+      <Visible>False</Visible>
+    </CodeAnalysisDependentAssemblyPaths>
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="StructPacking.cs" />
+  </ItemGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+  <PropertyGroup Condition=" '$(MsBuildProjectDirOverride)' != '' "></PropertyGroup>
+</Project>