public async Task Update_File_Contents()
{
var rnd = new Random();
var data = new byte[100];
rnd.NextBytes(data);
//Create a unique file name
var fileName = Guid.NewGuid().ToString();
//Upload a file
var upload = _filesApi.CreateFile(fileName, _testFolder, data.Length, data);
//Create new file data
var newData = new byte[200];
rnd.NextBytes(data);
//Update file contents
var updatedFile = _filesApi.UpdateFileContents(upload.Id, newData.Length, newData);
Assert.AreEqual(200, updatedFile.Size);
//Create buffer for download
var downloadedFile = new byte[200];
//Download file
var wait = new WaitForVirusScan(_filesApi);
(await wait.DownloadFileWithRetry(upload.Id)).Read(downloadedFile);
Assert.AreEqual(newData, downloadedFile);
}