public function testAddGet()
 {
     $data1 = array('2', 'Boo', 'Moeow');
     $data2 = array('1', 'Willy', 'Wonka');
     // Queue first message
     $this->assertTrue($this->object->add($data1));
     $this->assertEquals(1, $this->object->last_job_id);
     // Queue second message
     $this->assertTrue($this->object->add($data2));
     // Check get method
     $this->assertEquals($data2, $this->object->get($this->object->last_job_id));
     // Check get method with no message ID.
     $this->assertEquals($data1, $this->object->get());
 }