    # File lib/active_support/testing/performance.rb, line 54
          def run_test(metric, mode)
            run_callbacks :setup
            setup
            metric.send(mode) { __send__ @method_name }
          rescue ::Test::Unit::AssertionFailedError => e
            add_failure(e.message, e.backtrace)
          rescue StandardError, ScriptError
            add_error($!)
          ensure
            begin
              teardown
              run_callbacks :teardown, :enumerator => :reverse_each
            rescue ::Test::Unit::AssertionFailedError => e
              add_failure(e.message, e.backtrace)
            rescue StandardError, ScriptError
              add_error($!)
            end
          end