NH-2779 - Use provided LogSpy which restores log level on dispose

Author: hazzik

src/NHibernate.Test/NHSpecificTest/NH2779/Fixture.cs

@@ -1,9 +1,5 @@
-using System;
-using log4net;
-using log4net.Appender;
+using log4net;
 using log4net.Core;
-using log4net.Layout;
-using log4net.Repository.Hierarchy;
 using NUnit.Framework;
 
 namespace NHibernate.Test.NHSpecificTest.NH2779
@@ -17,14 +13,14 @@ public void Test()
 			using (ISession session = OpenSession())
 			using (ITransaction tx = session.BeginTransaction())
 			{
-				Order order = new Order() { OrderId = "Order-1", InternalOrderId = 1 };
+				Order order = new Order { OrderId = "Order-1", InternalOrderId = 1 };
 				session.Save(order);
 				tx.Commit();
 			}
 
-			using (ISession session = OpenSession())
-			using (ITransaction tx = session.BeginTransaction())
-			using (LogSpy logSpy = new LogSpy()) //  <-- Logging must be set DEBUG to reproduce bug
+			using (var session = OpenSession())
+			using (var tx = session.BeginTransaction())
+			using (new LogSpy(LogManager.GetLogger("NHibernate"), Level.All)) //  <-- Logging must be set DEBUG to reproduce bug
 			{
 				Order order = session.Get<Order>("Order-1");
 				Assert.IsNotNull(order);
@@ -34,28 +30,5 @@ public void Test()
 				tx.Commit();
 			}
 		}
-
-		public class LogSpy : IDisposable
-		{
-			private readonly DebugAppender appender;
-			private readonly Logger loggerImpl;
-
-			public LogSpy()
-			{
-				appender = new DebugAppender
-				{
-					Layout = new PatternLayout("%message"),
-					Threshold = Level.All
-				};
-				loggerImpl = (Logger)LogManager.GetLogger("NHibernate").Logger;
-				loggerImpl.AddAppender(appender);
-				loggerImpl.Level = Level.All;
-			}
-
-			public void Dispose()
-			{
-				loggerImpl.RemoveAppender(appender);
-			}
-		}
 	}
 }