submit-social-housing-lettings-and-sales-data/app/services/storage_service.rb

class StorageService
  def list_files(_folder)
    raise NotImplementedError
  end

  def folder_present?(_folder)
    raise NotImplementedError
  end

  def get_file_io(_file_name)
    raise NotImplementedError
  end

  def write_file(_file_name, _data)
    raise NotImplementedError
  end
end