public async Task GetContainerSas()
        {
            string fileName = Guid.NewGuid().ToString() + ".containersas.txt";
            string filePath = StoragePath.Combine("test", fileName);
            await _native.WriteTextAsync(filePath, "whack!");

            var    policy = new ContainerSasPolicy(DateTime.UtcNow, TimeSpan.FromHours(1));
            string sas    = await _native.GetContainerSasAsync("test", policy, true);

            //check we can connect and list test file in the root
            IBlobStorage sasInstance         = StorageFactory.Blobs.AzureBlobStorageFromSas(sas);
            IReadOnlyCollection <Blob> blobs = await sasInstance.ListAsync(StoragePath.RootFolderPath);

            Blob testBlob = blobs.FirstOrDefault(b => b.FullPath == fileName);

            Assert.NotNull(testBlob);
        }