think\Debug::getUseTime PHP Method

    public static function getUseTime($dec = 6)
    {
        return number_format(microtime(true) - THINK_START_TIME, $dec);
    }

 /**
  * @covers think\Debug::getUseTime
  * @todo Implement testGetUseTime().
  */
 public function testGetUseTime()
 {
     $start = "testGetUseTimeStart";
     $end = "testGetUseTimeEnd";
     \think\Debug::remark($start);
     sleep(1);
     $time = \think\Debug::getUseTime($start, $end);
     $this->assertLessThan(6, $time);
 }