NH-3491 - Add test case

src/NHibernate.Test/NHSpecificTest/NH3491/FixtureByCode.cs

@@ -0,0 +1,57 @@
+using System;
+using NHibernate.Cfg.MappingSchema;
+using NHibernate.Mapping.ByCode;
+using NUnit.Framework;
+using System.Linq;
+
+namespace NHibernate.Test.NHSpecificTest.NH3491
+{
+	[TestFixture]
+	public class FixtureByCode
+	{
+		class SomeComponent
+		{
+			public virtual string PropertyOne { get; set; }
+			public virtual string PropertyTwo { get; set; }
+			public virtual string PropertyThree { get; set; }
+		}
+
+		class ClassWithComponents
+		{
+			public virtual Guid Id { get; set; }
+
+			public virtual SomeComponent Component1 { get; set; }
+
+			public virtual SomeComponent Component2 { get; set; }
+		}
+
+		[Test(Description = "NH-3491"), KnownBug("NH-3491")]
+		public void ShouldProperlyMapComponentWhenMappingOnlyPartOfItInSomePlaces()
+		{
+			var mapper = new ModelMapper();
+			mapper.Class<ClassWithComponents>(cm =>
+			{
+				cm.Component(x => x.Component1, c =>
+				{
+					c.Property(x => x.PropertyOne, p => p.Column("OnePropertyOne"));
+				});
+
+				cm.Component(x => x.Component2, c =>
+				{
+					c.Property(x => x.PropertyOne, p => p.Column("TwoPropertyOne"));
+					c.Property(x => x.PropertyTwo, p => p.Column("TwoPropertyTwo"));
+				});
+			});
+
+			//Compile, and get the component property in which we mapped only one inner property
+			var mappings = mapper.CompileMappingForAllExplicitlyAddedEntities();
+
+			var component1PropertyMapping = (HbmComponent)mappings.RootClasses[0].Properties.Single(x => x.Name == "Component1");
+
+			//There should be only one inner property in the mapping of this component
+			// Note: take a look at how CURRENTLY the test fails with 1 expected vs 2, instead of vs 3. 
+			//       This means that the "PropertyThree" property of the component that was never mapped, is not taken into account (which is fine).
+			Assert.That(component1PropertyMapping.Items.Length, Is.EqualTo(1));
+		}
+	}
+}

src/NHibernate.Test/NHibernate.Test.csproj

@@ -731,6 +731,7 @@
     <Compile Include="NHSpecificTest\NH3487\Fixture.cs" />
     <Compile Include="NHSpecificTest\NH3567\DomainClass.cs" />
     <Compile Include="NHSpecificTest\NH3567\NH3567Tests.cs" />
+    <Compile Include="NHSpecificTest\NH3491\FixtureByCode.cs" />
     <Compile Include="NHSpecificTest\NH3570\BiFixture.cs" />
     <Compile Include="NHSpecificTest\NH3570\Model.cs" />
     <Compile Include="NHSpecificTest\NH3570\UniFixture.cs" />