Gc\Document\Model::getChildren PHP Method

    public function getChildren()
    {
        if ($this->getData('children') === null) {
            $children = new Collection();
            $children->load($this->getId());
            $this->setData('children', $children->getChildren());
        }
        return $this->getData('children');
    }

 /**
  * Test
  *
  * @return void
  */
 public function testGetChildren()
 {
     $this->assertInternalType('array', $this->object->getChildren());
 }