Add basic OneToOneType persistence test.

Author: David Ellingsworth

src/NHibernate.Test/OneToOneType/Details.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NHibernate.Test.OneToOneType
+{
+	public class Details
+	{
+		public virtual int Id { get; protected set; }
+		public virtual Owner Owner { get; protected internal set; }
+		public virtual string Data { get; set; }
+	}
+}

src/NHibernate.Test/OneToOneType/Fixture.cs

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+using NHibernate.Test.NHSpecificTest;
+using NUnit.Framework;
+
+namespace NHibernate.Test.OneToOneType
+{
+	[TestFixture]
+	public class Fixture : BugTestCase
+	{
+		protected override void OnTearDown()
+		{
+			using (var s = Sfi.OpenSession())
+			using (var tx = s.BeginTransaction())
+			{
+				s.CreateQuery("delete from Details").ExecuteUpdate();
+				s.CreateQuery("delete from Owner").ExecuteUpdate();
+
+				tx.Commit();
+			}
+		}
+
+		[Test]
+		public void OneToOnePersistedOnOwnerUpdate()
+		{
+			object ownerId;
+
+			using (var s = Sfi.OpenSession())
+			using (var tx = s.BeginTransaction())
+			{
+				var owner = new Owner()
+				{
+					Name = "Owner",
+				};
+
+				ownerId = s.Save(owner);
+
+				tx.Commit();
+			}
+
+			using (var s = Sfi.OpenSession())
+			using (var tx = s.BeginTransaction())
+			{
+				Owner owner = s.Load<Owner>(ownerId);
+
+				owner.Details = new Details()
+				{
+					Data = "Owner Details"
+				};
+
+				tx.Commit();
+			}
+
+			using (var s = Sfi.OpenSession())
+			using (var tx = s.BeginTransaction())
+			{
+				Owner owner = s.Get<Owner>(ownerId);
+
+				Assert.NotNull(owner.Details);
+			}
+		}
+	}
+}

src/NHibernate.Test/OneToOneType/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.OneToOneType" default-lazy="false">
+  <class name="Owner">
+    <id name="Id" unsaved-value="0" generator="native"/>
+    <property name="Name"/>
+    <one-to-one name="Details" class="Details" cascade="all"/>
+  </class>
+
+  <class name="Details">
+    <id name="Id" unsaved-value="0">
+      <generator class="foreign">
+        <param name="property">Owner</param>
+      </generator>
+    </id>
+    <one-to-one name="Owner" class="Owner" constrained="true"/>
+    <property name="Data"/>
+  </class>
+</hibernate-mapping>

src/NHibernate.Test/OneToOneType/Owner.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NHibernate.Test.OneToOneType
+{
+	public class Owner
+	{
+		private Details _details;
+
+		public virtual int Id { get; protected set; }
+		public string Name { get; set; }
+		public virtual Details Details {
+			get => _details;
+			set
+			{
+				_details = value;
+
+				if (_details != null)
+				{
+					_details.Owner = this;
+				}
+			}
+		}
+	}
+}