public CloudQueueFactoryTest()
        {
            // Note: the tests here heavily depend on "real" Azure.Storage entities - we do mock the virtual methods,
            // but all constructors are "real" code.
            // Therefore, a change in next version of Azure.Storage SDK may break our tests (in that case maybe wrap any Azure.Storage entity
            // in a proxy or a wrapper class with the public interface and test that)

            _cloudQueueClientFactoryMock = Substitute.For <ICloudQueueClientFactory>();

            // Mock entire CloudQueueClient - the factory code for it havily depends on MS Azure.Storage entities
            // whose logic we do not want to test
            // What we do want to test is how many times .GetCloudQueueClient() or .GetQueueReference() has been called
            {
                _cloudQueueClientMock = Substitute.ForPartsOf <CloudQueueClient>(
                    new StorageUri(new Uri("https://test.com")),
                    new Microsoft.Azure.Storage.Auth.StorageCredentials(),
                    null);

                _cloudQueueClientMock.When(c => c.GetQueueReference(Arg.Any <string>())).DoNotCallBase();
                _cloudQueueClientMock.GetQueueReference(Arg.Any <string>())
                .Returns(x =>
                {
                    CloudQueue queue = Substitute.ForPartsOf <CloudQueue>(new Uri($"http://test.com/{x.Arg<string>()}"));
                    queue.When(q => q.CreateIfNotExistsAsync()).DoNotCallBase();
                    queue.CreateIfNotExistsAsync().Returns(Task.FromResult(true));
                    return(queue);
                });

                _cloudQueueClientFactoryMock.GetCloudQueueClient().Returns(_ => _cloudQueueClientMock);
            }

            _cloudQueueFactory = new CloudQueueFactory(_cloudQueueClientFactoryMock);
        }