public async Task DownloadWithProgressTest()
{
var testFileContent = Enumerable.Range(1, 1000).Select(i => (byte)(i & 255)).ToArray();
var testFile = await Amazon.Files.UploadNew(TestDirId, testFileName, () => new MemoryStream(testFileContent));
var memStr = new MemoryStream();
await Amazon.Files.Download(testFile.id, memStr, progress: Progress1);
Assert.Equal(testFileContent, memStr.ToArray());
}