public function testListJobs()
 {
     $before = $this->object->listJobs();
     $job = $this->object->newJob('1 2 3 4 5 w');
     $this->object->add($job);
     $job2 = $this->object->newJob('2 3 4 5 6 w');
     $this->object->add($job2, '/tmp/a1');
     $this->object->save();
     $saved = $this->object->listJobs();
     $this->assertNotEquals($before, $saved);
     $this->assertNotEmpty($before);
     $this->assertNotEmpty($saved);
     $initial = '*	*	*	*	*	w > /tmp/sysload';
     $this->assertContains($initial, $saved);
     $this->assertContains($initial, $before);
 }