public async Task DownloadFile_when_file_exists_Then_it_returns_the_file()
{
var result = await _fileStorageService.DownloadFile(_applicationId, _sequenceNumber, _sectionNumber, _pageId, _fileName, _containerType, new CancellationToken());;
Assert.IsNotNull(result);
StringAssert.AreEqualIgnoringCase(_fileName, result.FileName);
}