Add failing tests

Author: hazzik

src/NHibernate.Test/NHSpecificTest/GH1754/Entity.cs

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+using System;
+
+namespace NHibernate.Test.NHSpecificTest.GH1754
+{
+	class Entity
+	{
+		public virtual int Id { get; set; }
+		public virtual string Name { get; set; }
+	}
+}

src/NHibernate.Test/NHSpecificTest/GH1754/Fixture.cs

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+using System.Linq;
+using NHibernate.Cfg;
+using NUnit.Framework;
+
+namespace NHibernate.Test.NHSpecificTest.GH1754
+{
+	[TestFixture]
+	public class Fixture : BugTestCase
+	{
+		protected override void OnSetUp()
+		{
+			Sfi.Statistics.IsStatisticsEnabled = true;
+		}
+
+		protected override void OnTearDown()
+		{
+			Sfi.Statistics.IsStatisticsEnabled = false;
+			using (var session = OpenSession())
+			using (var transaction = session.BeginTransaction())
+			{
+				session.CreateQuery("delete from System.Object").ExecuteUpdate();
+
+				transaction.Commit();
+			}
+		}
+
+		[Test]
+		public void PersistIdentityDoNotImmediateExecuteQuery()
+		{
+			using (var session = OpenSession())
+			{
+				Sfi.Statistics.Clear();
+				session.Persist(new Entity {Name = "Test"});
+
+				Assert.That(Sfi.Statistics.EntityInsertCount, Is.EqualTo(0));
+
+				session.Flush();
+
+				Assert.That(Sfi.Statistics.EntityInsertCount, Is.EqualTo(1));
+			}
+		}
+
+		[Test]
+		public void PersistIdentityDoNotSaveIfSessionIsNotFlushed()
+		{
+			using (var session = OpenSession())
+			{
+				session.Persist(new Entity {Name = "Test"});
+			}
+
+			using (var session = OpenSession())
+			{
+				var count = session.Query<Entity>().Count();
+				Assert.That(count, Is.EqualTo(0));
+			}
+		}
+	}
+}

src/NHibernate.Test/NHSpecificTest/GH1754/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.GH1754">
+
+  <class name="Entity">
+    <id name="Id" generator="identity"/>
+    <property name="Name"/>
+  </class>
+
+</hibernate-mapping>