public static function tearDownAfterClass()
 {
     if (self::ENABLE_TESTS && self::SHOW_DURATIONS) {
         $result = PHP_EOL;
         foreach (self::$stopwatch->getSections() as $section) {
             foreach ($section->getEvents() as $testName => $event) {
                 $result .= sprintf('Test: %s. Duration: %d ms. Deviation: %.2f.', $testName, $event->getDuration(), $event->getDuration() / (self::$standardDuration ?: 1)) . PHP_EOL;
             }
         }
         echo $result;
     }
     self::$stopwatch = null;
 }