public function testIsWaiting()
 {
     $job = $this->schedule->getJob(1);
     $job2 = $this->schedule->getJob(2);
     $this->schedule->run($job);
     $this->schedule->run($job2);
     $this->assertTrue($this->schedule->isRunning($job));
     $this->assertTrue($this->schedule->isWaiting($job2));
     sleep(6);
     $this->assertFalse($this->schedule->isRunning($job));
     $this->assertFalse($this->schedule->isWaiting($job2));
 }