public function testDeleteWithChildrenRoot()
 {
     $this->assertEquals(13, Node::findOne(1)->deleteWithChildren());
     $this->assertEquals(13, AttributeModeNode::findOne(1)->deleteWithChildren());
     $this->assertEquals(13, MultipleTreeNode::findOne(1)->deleteWithChildren());
     $dataSet = $this->getConnection()->createDataSet(['tree', 'attribute_mode_tree', 'multiple_tree']);
     $expectedDataSet = new ArrayDataSet(require __DIR__ . '/data/test-delete-with-children-root.php');
     $this->assertDataSetsEqual($expectedDataSet, $dataSet);
 }