public function testGetReferers()
{
$this->assertInternalType('array', $this->object->getReferers('TEST'));
$this->assertInternalType('array', $this->object->getReferers('HOUR'));
$this->assertInternalType('array', $this->object->getReferers('DAY'));
$this->assertInternalType('array', $this->object->getReferers('MONTH'));
$this->assertInternalType('array', $this->object->getReferers('YEAR'));
}