instance method verify_integrity_of

# File activestorage/lib/active_storage/service.rb, line 233
      def verify_integrity_of(file, checksum:)
        actual_checksum = compute_checksum(file)
        unless actual_checksum == checksum
          raise ActiveStorage::IntegrityError, "Checksum verification failed expecting #{checksum}, but downloaded file having #{actual_checksum}"
        end
      end