public void TestDownloadFile()
        {
            var id         = CreateTestBlob(filePath);
            var fileStream = DownloadFile.DriveDownloadFile(id);
            var content    = fileStream.GetBuffer();

            Assert.AreNotEqual(0, content.Length);
            Assert.AreEqual(0xFF, content[0]);
            Assert.AreEqual(0XD8, content[1]);
        }