Added more AOT tests

Author: sakno

src/DotNext.AotTests/Runtime/BoxedValueTests.cs

@@ -0,0 +1,63 @@
+namespace DotNext.Runtime;
+
+[TestClass]
+public sealed class BoxedValueTests
+{
+    [TestMethod]
+    public void BoxUnbox()
+    {
+        var obj = (BoxedValue<int>)42;
+        Assert.AreEqual(42.GetHashCode(), obj.GetHashCode());
+        Assert.AreEqual(42, obj.Value);
+        Assert.AreEqual(42, (int)obj);
+        Assert.AreEqual(typeof(int), obj.GetType());
+    }
+
+    [TestMethod]
+    public void Unwrap()
+    {
+        object? obj = null;
+        Assert.IsNull(BoxedValue<int>.GetTypedReference(obj));
+
+        obj = 42;
+        Assert.AreEqual(42, BoxedValue<int>.GetTypedReference(obj).Value);
+
+        obj = string.Empty;
+        Assert.ThrowsException<ArgumentException>(() => BoxedValue<int>.GetTypedReference(obj));
+    }
+
+    [TestMethod]
+    public void ToUntypedReference()
+    {
+        ValueType obj = BoxedValue<int>.Box(42);
+        Assert.AreEqual(42, obj);
+    }
+
+    private struct MutableStruct
+    {
+        public int Value;
+    }
+
+    [TestMethod]
+    public void BitwiseCopyImmutable()
+    {
+        var boxed1 = (BoxedValue<int>)42;
+        var boxed2 = boxed1.Copy();
+        Assert.AreNotSame(boxed1, boxed2);
+        Assert.AreEqual(42, boxed1);
+        Assert.AreEqual(42, boxed2);
+    }
+
+    [TestMethod]
+    public void BitwiseCopyMutable()
+    {
+        var boxed1 = (BoxedValue<MutableStruct>)new MutableStruct();
+        var boxed2 = boxed1.Copy();
+        Assert.AreNotSame(boxed1, boxed2);
+
+        boxed1.Value.Value = 42;
+        boxed2.Value.Value = 43;
+
+        Assert.AreNotEqual(boxed1.Value.Value, boxed2.Value.Value);
+    }
+}