Add tests for NH-2783

Author: hazzik

src/NHibernate.Test/NHSpecificTest/NH2783/Bar.cs

@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+
+namespace NHibernate.Test.NHSpecificTest.NH2783
+{
+	class Bar
+	{
+		public virtual int Id { get; set; }
+		
+		public virtual int DynValString2 { get; set; }
+
+		public virtual IDictionary<string, object> MyProps { get; set; } = new Dictionary<string, object>();
+	}
+}

src/NHibernate.Test/NHSpecificTest/NH2783/Fixture.cs

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+using NUnit.Framework;
+
+namespace NHibernate.Test.NHSpecificTest.NH2783
+{
+	[TestFixture]
+	public class Fixture : BugTestCase
+	{
+		protected override void OnSetUp()
+		{
+		}
+
+		protected override void OnTearDown()
+		{
+			using (var session = OpenSession())
+			using (var transaction = session.BeginTransaction())
+			{
+				// The HQL delete does all the job inside the database without loading the entities, but it does
+				// not handle delete order for avoiding violating constraints if any. Use
+				// session.Delete("from System.Object");
+				// instead if in need of having NHbernate ordering the deletes, but this will cause
+				// loading the entities in the session.
+				session.CreateQuery("delete from System.Object").ExecuteUpdate();
+
+				transaction.Commit();
+			}
+		}
+
+		[Test]
+		public void DoNothing()
+		{
+		}
+	}
+}

src/NHibernate.Test/NHSpecificTest/NH2783/Foo.cs

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+using System.Collections.Generic;
+
+namespace NHibernate.Test.NHSpecificTest.NH2783
+{
+	class Foo
+	{
+		public virtual int Id { get; set; }
+
+		public virtual IDictionary<string, object> MyProps { get; set; } = new Dictionary<string, object>();
+	}
+}

src/NHibernate.Test/NHSpecificTest/NH2783/Mappings.hbm.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
+                   assembly="NHibernate.Test"
+                   namespace="NHibernate.Test.NHSpecificTest.NH2783">
+
+  <class name="Foo">
+    <id type="int" name="Id">
+      <column name="Id"/>
+      <generator class="native"/>
+    </id>
+
+    <dynamic-component name="MyProps">
+      <many-to-one name="DynPointer" class="Bar" property-ref="MyProps.DynValString2"/>
+    </dynamic-component>
+  </class>
+
+  <class name="Bar">
+    <id type="int" name="Id">
+      <column name="Id"/>
+      <generator class="native"/>
+    </id>
+    <dynamic-component name="MyProps">
+      <property name="DynValString2" type="string" unique="1"/>
+    </dynamic-component>
+  </class>
+</hibernate-mapping>