public function testShouldExecuteJobsInBackgroundFirst()
 {
     $closure = function ($nums) {
         return array_sum($nums);
     };
     $scheduler = new Scheduler();
     $scheduler->call($closure)->at('* * * * *');
     $scheduler->raw('echo "raw command"')->at('* * * * *');
     $scheduler->jobsInBackgroundFirst();
     $jobs = $scheduler->getJobs();
     $this->assertTrue($jobs[0]->runInBackground);
 }