public function testSetFilterable()
 {
     $this->assertEquals($this->objProperty, $this->objProperty->setFilterable(false));
     $this->assertEquals(false, $this->objProperty->isFilterable());
     $this->assertEquals(false, $GLOBALS['TL_DCA']['tl_test']['fields']['test']['filter']);
     $this->assertEquals($this->objProperty, $this->objProperty->setFilterable(true));
     $this->assertEquals(true, $this->objProperty->isFilterable());
     $this->assertEquals(true, $GLOBALS['TL_DCA']['tl_test']['fields']['test']['filter']);
 }