public function testTreeId() { $tree = new Baobab(self::$db, self::$forest_name); $this->assertEquals(0, $tree->tree_id); $tree->appendChild(); $this->assertEquals(1, $tree->tree_id); $reloadedTree = new Baobab(self::$db, self::$forest_name, 1); $reloadedTree->appendChild(); $this->assertEquals(1, $reloadedTree->tree_id); }