How to mock file upload with RSpec 3.0 ? [SOLVED]

One more note on RSpec 3.0, this time one useful function that mocks File Upload , saves file/archive content to memory so after it you can do whatever your soul wants with it. Test file/archive should exist in the file system.

def mock_archive_upload(archive_path, type)
  return ActionDispatch::Http::UploadedFile.new(:tempfile => File.new(Rails.root + archive_path , :type => type, :filename => File.basename(File.new(Rails.root + archive_path))))
end

e.g of use:

#saves archive into memory so it can be manipulated in tests
mock_archive_upload("../fixtues/my_archive.zip", "application/zip")