public function testStartTime() {
$event = new StopwatchEvent(microtime(true) * 1000);
$this
->assertTrue($event
->getStartTime() < 0.5);
$event = new StopwatchEvent(microtime(true) * 1000);
$event
->start();
$event
->stop();
$this
->assertTrue($event
->getStartTime() < 1);
$event = new StopwatchEvent(microtime(true) * 1000);
$event
->start();
usleep(10000);
$event
->stop();
$start = $event
->getStartTime();
$this
->assertTrue($start >= 0 && $start <= 20);
}