Add test for nhibernate#3707

Author: hazzik

src/NHibernate.Test/NHSpecificTest/GH3707/Entity.cs

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+using System;
+
+namespace NHibernate.Test.NHSpecificTest.GH3707
+{
+	partial class Entity
+	{
+		public virtual Guid Id { get; set; }
+		public virtual string Name { get; set; }
+		
+		public virtual DateTime DateTime1 { get; set; }
+		public virtual DateTime DateTime2 { get; set; }
+	}
+}

src/NHibernate.Test/NHSpecificTest/GH3707/Fixture.cs

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+using System;
+using System.Linq;
+using NHibernate.Dialect;
+using NUnit.Framework;
+
+namespace NHibernate.Test.NHSpecificTest.GH3707
+{
+	[TestFixture]
+	public class Fixture : BugTestCase
+	{
+		protected override bool AppliesTo(Dialect.Dialect dialect)
+		{
+			return dialect is Oracle8iDialect;
+		}
+
+		protected override void OnSetUp()
+		{
+			using var session = OpenSession();
+			using var transaction = session.BeginTransaction();
+
+			session.Save(new Entity
+			{
+				Name = "Bob", 
+				DateTime1 = new DateTime(2015, 10, 21),
+				DateTime2 = new DateTime(2015, 10, 21),
+			});
+			
+			session.Save(new Entity
+			{
+				Name = "Alice", 
+				DateTime1 = new DateTime(2015, 10, 21),
+				DateTime2 = new DateTime(2015, 10, 21),
+			});
+
+			transaction.Commit();
+		}
+
+		protected override void OnTearDown()
+		{
+			using var session = OpenSession();
+			using var transaction = session.BeginTransaction();
+
+			session.CreateQuery("delete from System.Object").ExecuteUpdate();
+
+			transaction.Commit();
+		}
+
+		[Test]
+		public void ShouldStoreSameValues()
+		{
+			using (var session = OpenSession())
+			{
+				using var transaction = session.BeginTransaction();
+
+				session.CreateQuery("update Entity set DateTime1 = current_timestamp, DateTime2 = current_timestamp where name = 'Bob'")
+				       .ExecuteUpdate();
+				
+				session.CreateQuery("update Entity set DateTime1 = localtimestamp, DateTime2 = localtimestamp where name = 'Alice'")
+				       .ExecuteUpdate();
+
+				transaction.Commit();
+			}
+
+			using (var session = OpenSession())
+			{
+				var bob = session
+				             .Query<Entity>()
+				             .Single(e => e.Name == "Bob");
+
+				Assert.That(bob.DateTime1, Is.EqualTo(bob.DateTime2));
+				Assert.That(bob.DateTime1.Kind, Is.EqualTo(DateTimeKind.Unspecified));
+				Assert.That(bob.DateTime2.Kind, Is.EqualTo(DateTimeKind.Unspecified));
+				Assert.That(bob.DateTime1, Is.EqualTo(DateTime.Now).Within(TimeSpan.FromSeconds(5)));
+			}
+		}
+	}
+}

src/NHibernate.Test/NHSpecificTest/GH3707/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.GH3707">
+
+  <class name="Entity">
+    <id name="Id" generator="guid.comb"/>
+    <property name="Name"/>
+    <property name="DateTime1">
+      <column name="DT1" sql-type="TIMESTAMP"/>
+    </property>
+    <property name="DateTime2">
+      <column name="DT2" sql-type="TIMESTAMP WITH TIME ZONE"/>
+    </property>
+  </class>
+
+</hibernate-mapping>