public async Task TestExists()
        {
            CloudBlobContainer container = _blobClient.GetContainerReference("container");

            container.CreateIfNotExists();
            await CreateEmptyBlob(container.GetBlockBlobReference("blob1"));

            AzureBlobContainer azureBlobContainer = new AzureBlobContainer(container);

            Assert.IsTrue(await azureBlobContainer.Exists());

            container.Delete();
            Assert.IsFalse(await azureBlobContainer.Exists());
        }