public void CloneTest()
{
var config = new DomainConfiguration();
TypeRegistry registry1 = config.Types;
registry1.Register(typeof(A).Assembly, "Xtensive.Orm.Tests.RegistryModel1");
var registry2 = registry1.Clone() as TypeRegistry;
Assert.IsNotNull(registry2);
Assert.AreEqual(registry1.Count, registry2.Count);
}