public void GetService_can_be_accessed_from_multiple_threads_concurrently()
        {
            for (var i = 0; i < 30; i++)
            {
                var bag      = new ConcurrentBag <IPilkington>();
                var karl1    = new Mock <IPilkington>().Object;
                var resolver = new CompositeResolver <IDbDependencyResolver, IDbDependencyResolver>(
                    new SingletonDependencyResolver <IPilkington>(karl1),
                    new SingletonDependencyResolver <IPilkington>(new Mock <IPilkington>().Object));

                ExecuteInParallel(() => bag.Add(resolver.GetService <IPilkington>()));

                Assert.Equal(20, bag.Count);
                Assert.True(bag.All(c => karl1 == c));
            }
        }
 public virtual TService GetService <TService>(object key)
 {
     return(_resolvers.GetService <TService>(key));
 }