Add MemoryMarshalTest

Author: jerviscui

src/Tests/MemoryModelTest/MemoryMarshalTest.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace MemoryModelTest;
+
+public static class MemoryMarshalTest
+{
+
+    #region Constants & Statics
+
+    public static unsafe void GetReferenceNull_WithEmptySpanTest()
+    {
+#pragma warning disable CA1825
+        var array = new byte[0];
+#pragma warning restore CA1825
+        var a = new Span<byte>(array);
+
+        ref var r = ref MemoryMarshal.GetReference(a);
+        //r is 0
+
+        fixed (byte* pbData = &MemoryMarshal.GetReference(a))
+        {
+            //pbData is not null, 0x000002191c40ee30
+        }
+    }
+
+    public static unsafe void GetReferenceNullTest()
+    {
+        var a = new Span<byte>(null);
+
+        ref var r = ref MemoryMarshal.GetReference(a);
+        //'r' threw an exception of type 'System.NullReferenceException'
+
+        fixed (byte* pbData = &MemoryMarshal.GetReference(a))
+        {
+            //pbData is 0x0000000000000000, is null
+        }
+    }
+
+    #endregion
+
+}

src/Tests/MemoryModelTest/Program.cs

@@ -1,13 +1,11 @@
-using System.Threading.Tasks;
-
 namespace MemoryModelTest;
 
 internal static class Program
 {
 
     #region Constants & Statics
 
-    public static async Task Main(string[] args)
+    public static void Main(string[] args)
     {
         //VolatileTest.Worker_Test();
         //Console.WriteLine();
@@ -40,7 +38,10 @@ public static async Task Main(string[] args)
         //MemoryOwnerTest.SliceTest();
         //await MemoryOwnerTest.AllocateLengthTestAsync();
 
-        await SpanOwnerTest.Test();
+        //await SpanOwnerTest.Test();
+
+        MemoryMarshalTest.GetReferenceNullTest();
+        MemoryMarshalTest.GetReferenceNull_WithEmptySpanTest();
     }
 
     #endregion