public async Task TestResizeImage()
{
using Stream stream = new MemoryStream();
string message = "{ \"image\": \"test.png\", \"size\": 64 }";
_fileRepository.Setup(s => s.DownloadFile("test.png")).Returns(Task.FromResult(stream));
await _function.Run(message, _logger.Object);
_imageHandler.Verify(v => v.Resize(stream, It.IsAny <Stream>(), 64));
_fileRepository.Verify(v => v.UploadFile("64/test.png", It.IsAny <Stream>()));
}