Added Testcase for NH3374

Session.Merge throws InvalidCastException when using a Lazy bytes[]
property

Author: davidroth

src/NHibernate.Test/NHSpecificTest/NH3374/Document.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace NHibernate.Test.NHSpecificTest.NH3374
+{
+	public class Document
+	{
+		public virtual int Id { get; set; }
+		public virtual string Name { get; set; }
+        public virtual Blob Blob { get; set; }
+	}
+
+    public class Blob
+    {
+        public virtual int Id { get; set; }
+        public virtual byte[] Bytes { get; set; }
+    }
+}

src/NHibernate.Test/NHSpecificTest/NH3374/FixtureByCode.cs

@@ -0,0 +1,104 @@
+using System.Linq;
+using NHibernate.Cfg.MappingSchema;
+using NHibernate.Linq;
+using NHibernate.Mapping.ByCode;
+using NUnit.Framework;
+
+namespace NHibernate.Test.NHSpecificTest.NH3374
+{
+	[Igonre("Not fixed yet.")]
+	public class ByCodeFixture : TestCaseMappingByCode
+	{
+		protected override HbmMapping GetMappings()
+		{
+			var mapper = new ModelMapper();
+			mapper.Class<Document>(rc =>
+			{
+				rc.Id(x => x.Id, idMapper => idMapper.Generator(Generators.Identity));
+				rc.ManyToOne(x => x.Blob, m =>
+					{
+						m.Cascade(Mapping.ByCode.Cascade.All);
+					});
+				rc.Property(x => x.Name);
+			});
+			
+			mapper.Class<Blob>(map =>
+				{
+					map.Id(x => x.Id, idMapper => idMapper.Generator(Generators.Identity));
+					map.Property(x => x.Bytes, y =>
+						{
+							y.Column(x =>
+							{
+								x.SqlType("varbinary(max)");
+								x.Length(int.MaxValue);
+							});
+							y.Lazy(true);
+						});
+				});
+
+			return mapper.CompileMappingForAllExplicitlyAddedEntities();
+		}
+
+		protected override void OnSetUp()
+		{
+			using (ISession session = OpenSession())
+			using (ITransaction transaction = session.BeginTransaction())
+			{
+				var e1 = new Document { Name = "Bob" };
+				e1.Blob = new Blob { Bytes = new byte[] { 1, 2, 3 } };
+				session.Save(e1);
+				
+				session.Flush();
+				transaction.Commit();
+			}
+		}
+
+		protected override void OnTearDown()
+		{
+			using (ISession session = OpenSession())
+			using (ITransaction transaction = session.BeginTransaction())
+			{
+				session.Delete("from System.Object");
+
+				session.Flush();
+				transaction.Commit();
+			}
+		}
+
+		[Test]
+		public void TestNoTargetException()
+		{
+			Document document = LoadDetachedEntity();
+			Blob blob = LoadDetachedBlob();
+
+			blob.Bytes = new byte[] { 4, 5, 6 };
+			document.Blob = blob;
+
+			using (ISession session = OpenSession())
+			using (ITransaction transaction = session.BeginTransaction())
+			{
+				session.Merge(document);
+			}
+		}
+
+		private Blob LoadDetachedBlob()
+		{
+			using (ISession session = OpenSession())
+			using (session.BeginTransaction())
+			{
+				var blob = session.Get<Blob>(1);
+				NHibernateUtil.Initialize(blob.Bytes);
+				return blob;
+			}
+		}
+
+		private Document LoadDetachedEntity()
+		{
+			using (ISession session = OpenSession())
+			using (session.BeginTransaction())
+			{
+				return session.Get<Document>(1);
+			}
+		}
+	}
+}

src/NHibernate.Test/NHibernate.Test.csproj

@@ -664,6 +664,8 @@
     <Compile Include="NHSpecificTest\BagWithLazyExtraAndFilter\Domain.cs" />
     <Compile Include="NHSpecificTest\BagWithLazyExtraAndFilter\Fixture.cs" />
     <Compile Include="Component\Basic\ComponentWithUniqueConstraintTests.cs" />
+    <Compile Include="NHSpecificTest\NH3374\Document.cs" />
+    <Compile Include="NHSpecificTest\NH3374\FixtureByCode.cs" />
     <Compile Include="NHSpecificTest\Dates\DateTimeOffsetQueryFixture.cs" />
     <Compile Include="NHSpecificTest\NH3050\Fixture.cs" />
     <Compile Include="NHSpecificTest\NH3050\Person.cs" />
@@ -2860,6 +2862,7 @@
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="NHSpecificTest\NH2860\Mappings.hbm.xml" />
+    <EmbeddedResource Include="NHSpecificTest\NH3374\Mappings.hbm.xml" />
     <EmbeddedResource Include="NHSpecificTest\NH3332\Mappings.hbm.xml" />
     <EmbeddedResource Include="NHSpecificTest\NH3050\Mappings.hbm.xml" />
     <EmbeddedResource Include="NHSpecificTest\NH2651\Mappings.hbm.xml" />