{
                $tree = 
new ilTree(ROOT_FOLDER_ID);
                $d = $tree->getDepth(24);
 
                
                $this->assertEquals(
$d,4);
                
                $node = $tree->getNodeData(24);
                $this->assertEquals($node['title'],'Public chat');
                
                $bool = $tree->isInTree(24);
                $this->assertEquals($bool,true);
                
                $bool = $tree->isInTree(24242424);
                $this->assertEquals($bool,false);
                
                
                
                $bool = $tree->isGrandChild(9,24);
                $this->assertEquals($bool,1);
                
                
 
                
                $bool = $tree->isDeleted(24);
                $this->assertEquals($bool,false);
                
                $id = $tree->getParentId(24);
                $this->assertEquals($id,14);
                
                $lft = $tree->getLeftValue(24);
                $this->assertEquals($lft,14);
                
                $seq = $tree->getChildSequenceNumber($tree->getNodeData(24));
                $this->assertEquals($seq,1);
                
                $tree->getNodePath(9,1);
                
                $max_depth = $tree->getMaximumDepth();
                
                
                $tree = 
new ilTree(ROOT_FOLDER_ID);
                $suc = $tree->fetchSuccessorNode(16); 
                $cals = $tree->fetchPredecessorNode($suc['child']);
                $this->assertEquals($cals['child'],16);
        }