Test for #1315: Ensure it works multiple inheritance levels deep.

test/Autofac.Specification.Test/Registration/OpenGenericTests.cs

@@ -55,6 +55,19 @@ public void ResolveClassWithRenamedTypeArguments()
         Assert.IsType<DerivedRepository<int, string>>(resolved);
     }
 
+    // Issue #1315: Class services fail to resolve if the names on the type
+    // arguments are changed. We should be able to handle a deep inheritance chain.
+    [Fact]
+    public void ResolveClassTwoLevelsDownWithRenamedTypeArguments()
+    {
+        var containerBuilder = new ContainerBuilder();
+        containerBuilder.RegisterGeneric(typeof(TwoLevelsDerivedRepository<,>)).As(typeof(BaseRepository<,>));
+
+        var container = containerBuilder.Build();
+        var resolved = container.Resolve<BaseRepository<string, int>>();
+        Assert.IsType<TwoLevelsDerivedRepository<int, string>>(resolved);
+    }
+
     private class SelfComponent<T> : IImplementedInterface<T>
     {
     }
@@ -68,4 +81,8 @@ private class BaseRepository<T1, T2>
     private class DerivedRepository<TSecond, TFirst> : BaseRepository<TFirst, TSecond>
     {
     }
+
+    private class TwoLevelsDerivedRepository<TA, TB> : DerivedRepository<TA, TB>
+    {
+    }
 }