--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HowTo/Aspects/MixinAspect.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,68 @@
+using System;
+
+using NUnit.Framework;
+
+using BLToolkit.Aspects;
+using BLToolkit.Reflection;
+
+namespace HowTo.Aspects
+{
+	[TestFixture]
+	public class MixinAspectTest
+	{
+		public interface ITestInterface1
+		{
+			int TestMethod(int value);
+		}
+
+		public class TestInterface1Impl : ITestInterface1
+		{
+			public int TestMethod(int value) { return value; }
+		}
+
+		public interface ITestInterface2
+		{
+			int TestMethod1(int value);
+			int TestMethod2(int value);
+		}
+
+		public class TestInterface2Impl : ITestInterface2
+		{
+			public int TestMethod1(int value) { return value; }
+			public int TestMethod2(int value) { return value; }
+		}
+
+		[/*[a]*/Mixin/*[/a]*/(/*[a]*/typeof/*[/a]*/(/*[a]*/ITestInterface1/*[/a]*/), /*[a]*/"_testInterface1"/*[/a]*/)]
+		[/*[a]*/Mixin/*[/a]*/(/*[a]*/typeof/*[/a]*/(/*[a]*/ITestInterface2/*[/a]*/), /*[a]*/"TestInterface2"/*[/a]*/, "'{0}.{1}' is null.")]
+		public /*[a]*/abstract/*[/a]*/ class TestClass
+		{
+			public TestClass()
+			{
+				/*[a]*/_testInterface1/*[/a]*/ = new /*[a]*/TestInterface1Impl/*[/a]*/();
+			}
+
+			/*[a]*/protected/*[/a]*/ /*[a]*/object/*[/a]*/          /*[a]*/_testInterface1/*[/a]*/;
+
+			private   ITestInterface2 _testInterface2;
+			public    /*[a]*/ITestInterface2/*[/a]*/  /*[a]*/TestInterface2/*[/a]*/
+			{
+				get { return _testInterface2 ?? (_testInterface2 = new /*[a]*/TestInterface2Impl/*[/a]*/()); }
+			}
+
+			[/*[a]*/MixinOverride/*[/a]*/(typeof(/*[a]*/ITestInterface2/*[/a]*/))]
+			protected int TestMethod1(int value) { return /*[a]*/15/*[/a]*/; }
+		}
+
+		[Test]
+		public void Test()
+		{
+			TestClass       tc = /*[a]*/TypeAccessor/*[/a]*/<TestClass>.CreateInstance();
+			ITestInterface1 i1 = (ITestInterface1)tc;
+			ITestInterface2 i2 = (ITestInterface2)tc;
+
+			Assert.AreEqual(/*[a]*/10/*[/a]*/, i1.TestMethod (/*[a]*/10/*[/a]*/));
+			Assert.AreEqual(/*[a]*/15/*[/a]*/, i2.TestMethod1(/*[a]*/20/*[/a]*/));
+			Assert.AreEqual(/*[a]*/30/*[/a]*/, i2.TestMethod2(/*[a]*/30/*[/a]*/));
+		}
+	}
+}