public function testExtends()
{
$objDc = $this->objProperty->getDataContainer();
$objNew = $objDc->createProperty('neu');
$this->assertEquals($objNew, $objNew->extend($this->objProperty));
$this->assertEquals($objNew->getLabel(), $this->objProperty->getLabel());
$this->assertEquals($objNew->getEvaluation(), $this->objProperty->getEvaluation());
$this->assertEquals($objNew->getParent(), $this->objProperty->getParent());
$this->assertEquals($objNew->isSearchable(), $this->objProperty->isSearchable());
$this->assertEquals($objNew->isSortable(), $this->objProperty->isSortable());
$this->assertEquals($objNew->isFilterable(), $this->objProperty->isFilterable());
$this->assertNotEquals($objNew->getName(), $this->objProperty->getName());
$this->assertNotEmpty($GLOBALS['TL_DCA']['tl_test']['fields']['neu'], $GLOBALS['TL_DCA']['tl_test']['fields']['test']);
}