sequel_transactional_unit_tests.rb

class Test::Unit::TestCase
  alias_method :run_without_transaction, :run
  def run(result)
    exception = nil

    Sequel::Model.db.transaction do
      begin
        run_without_transaction(result)
      rescue => exception
        # Capture exception, if raised
      ensure
        raise Sequel::Rollback
      end
    end

    raise exception if (exception)
  end
end