TreeBehaviorTest.php

<?php
/**
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @since         3.0.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Test\TestCase\ORM\Behavior;

use Cake\Collection\Collection;
use Cake\Event\Event;
use Cake\ORM\Behavior\TranslateBehavior;
use Cake\ORM\Entity;
use Cake\ORM\TableRegistry;
use Cake\TestSuite\TestCase;

/**
 * Translate behavior test case
 */
class TreeBehaviorTest extends TestCase
{

    /**
     * fixtures
     *
     * @var array
     */
    public $fixtures = [
        'core.number_trees',
        'core.menu_link_trees'
    ];

    public function setUp()
    {
        parent::setUp();
        $this->table = TableRegistry::get('NumberTrees');
        $this->table->primaryKey(['id']);
        $this->table->addBehavior('Tree');
    }

    public function tearDown()
    {
        parent::tearDown();
        TableRegistry::clear();
    }

    /**
     * Tests the find('path') method
     *
     * @return void
     */
    public function testFindPath()
    {
        $nodes = $this->table->find('path', ['for' => 9]);
        $this->assertEquals([1, 6, 9], $nodes->extract('id')->toArray());

        $nodes = $this->table->find('path', ['for' => 10]);
        $this->assertEquals([1, 6, 10], $nodes->extract('id')->toArray());

        $nodes = $this->table->find('path', ['for' => 5]);
        $this->assertEquals([1, 2, 5], $nodes->extract('id')->toArray());

        $nodes = $this->table->find('path', ['for' => 1]);
        $this->assertEquals([1], $nodes->extract('id')->toArray());

        // find path with scope
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $nodes = $table->find('path', ['for' => 5]);
        $this->assertEquals([1, 3, 4, 5], $nodes->extract('id')->toArray());
    }

    /**
     * Tests the childCount() method
     *
     * @return void
     */
    public function testChildCount()
    {
        // direct children for the root node
        $table = $this->table;
        $countDirect = $this->table->childCount($table->get(1), true);
        $this->assertEquals(2, $countDirect);

        // counts all the children of root
        $count = $this->table->childCount($table->get(1), false);
        $this->assertEquals(9, $count);

        // counts direct children
        $count = $this->table->childCount($table->get(2), false);
        $this->assertEquals(3, $count);

        // count children for a middle-node
        $count = $this->table->childCount($table->get(6), false);
        $this->assertEquals(4, $count);

        // count leaf children
        $count = $this->table->childCount($table->get(10), false);
        $this->assertEquals(0, $count);

        // test scoping
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $count = $table->childCount($table->get(3), false);
        $this->assertEquals(2, $count);
    }

    /**
     * Tests that childCount will provide the correct lft and rght values
     *
     * @return void
     */
    public function testChildCountNoTreeColumns()
    {
        $table = $this->table;
        $node = $table->get(6);
        $node->unsetProperty('lft');
        $node->unsetProperty('rght');
        $count = $this->table->childCount($node, false);
        $this->assertEquals(4, $count);
    }

    /**
     * Tests the childCount() plus callable scoping
     *
     * @return void
     */
    public function testCallableScoping()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', [
            'scope' => function ($query) {
                return $query->where(['menu' => 'main-menu']);
            }
        ]);
        $count = $table->childCount($table->get(1), false);
        $this->assertEquals(4, $count);
    }

    /**
     * Tests the find('children') method
     *
     * @return void
     */
    public function testFindChildren()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);

        // root
        $nodeIds = [];
        $nodes = $table->find('children', ['for' => 1])->all();
        $this->assertEquals([2, 3, 4, 5], $nodes->extract('id')->toArray());

        // leaf
        $nodeIds = [];
        $nodes = $table->find('children', ['for' => 5])->all();
        $this->assertEquals(0, count($nodes->extract('id')->toArray()));

        // direct children
        $nodes = $table->find('children', ['for' => 1, 'direct' => true])->all();
        $this->assertEquals([2, 3], $nodes->extract('id')->toArray());
    }

    /**
     * Tests that find('children') will throw an exception if the node was not found
     *
     * @expectedException \Cake\Datasource\Exception\RecordNotFoundException
     * @return void
     */
    public function testFindChildrenException()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $query = $table->find('children', ['for' => 500]);
    }

    /**
     * Tests the find('treeList') method
     *
     * @return void
     */
    public function testFindTreeList()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $result = $table->find('treeList')->toArray();
        $expected = [
            1 => 'Link 1',
            2 => '_Link 2',
            3 => '_Link 3',
            4 => '__Link 4',
            5 => '___Link 5',
            6 => 'Link 6',
            7 => '_Link 7',
            8 => 'Link 8'
        ];
        $this->assertEquals($expected, $result);
    }

    /**
     * Tests the find('treeList') method after moveUp, moveDown
     *
     * @return void
     */
    public function testFindTreeListAfterMove()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);

        // moveUp
        $table->moveUp($table->get(3), 1);
        $result = $table->find('treeList')->toArray();
        $expected = [
            1 => 'Link 1',
            3 => '_Link 3',
            4 => '__Link 4',
            5 => '___Link 5',
            2 => '_Link 2',
            6 => 'Link 6',
            7 => '_Link 7',
            8 => 'Link 8'
        ];
        $this->assertSame($expected, $result);

        // moveDown
        $table->moveDown($table->get(6), 1);
        $result2 = $table->find('treeList')->toArray();
        $expected2 = [
            1 => 'Link 1',
            3 => '_Link 3',
            4 => '__Link 4',
            5 => '___Link 5',
            2 => '_Link 2',
            8 => 'Link 8',
            6 => 'Link 6',
            7 => '_Link 7',
        ];
        $this->assertSame($expected2, $result2);
    }

    /**
     * Tests the find('treeList') method with custom options
     *
     * @return void
     */
    public function testFindTreeListCustom()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $result = $table
            ->find('treeList', ['keyPath' => 'url', 'valuePath' => 'id', 'spacer' => ' '])
            ->toArray();
        $expected = [
            '/link1.html' => '1',
            'http://example.com' => ' 2',
            '/what/even-more-links.html' => ' 3',
            '/lorem/ipsum.html' => '  4',
            '/what/the.html' => '   5',
            '/yeah/another-link.html' => '6',
            'http://cakephp.org' => ' 7',
            '/page/who-we-are.html' => '8'
        ];
        $this->assertEquals($expected, $result);
    }

    /**
     * Tests the moveUp() method
     *
     * @return void
     */
    public function testMoveUp()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);

        // top level, won't move
        $node = $this->table->moveUp($table->get(1), 10);
        $this->assertEquals(['lft' => 1, 'rght' => 10], $node->extract(['lft', 'rght']));

        // edge cases
        $this->assertFalse($this->table->moveUp($table->get(1), 0));
        $node = $this->table->moveUp($table->get(1), -10);
        $this->assertEquals(['lft' => 1, 'rght' => 10], $node->extract(['lft', 'rght']));

        // move inner node
        $node = $table->moveUp($table->get(3), 1);
        $nodes = $table->find('children', ['for' => 1])->all();
        $this->assertEquals([3, 4, 5, 2], $nodes->extract('id')->toArray());
        $this->assertEquals(['lft' => 2, 'rght' => 7], $node->extract(['lft', 'rght']));
    }

    /**
     * Tests moving a node with no siblings
     *
     * @return void
     */
    public function testMoveLeaf()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $node = $table->moveUp($table->get(5), 1);
        $this->assertEquals(['lft' => 6, 'rght' => 7], $node->extract(['lft', 'rght']));
    }

    /**
     * Tests moving a node to the top
     *
     * @return void
     */
    public function testMoveTop()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $node = $table->moveUp($table->get(8), true);
        $this->assertEquals(['lft' => 1, 'rght' => 2], $node->extract(['lft', 'rght']));
        $nodes = $table->find()
            ->select(['id'])
            ->where(function ($exp) {
                return $exp->isNull('parent_id');
            })
            ->where(['menu' => 'main-menu'])
            ->order(['lft' => 'ASC'])
            ->all();
        $this->assertEquals([8, 1, 6], $nodes->extract('id')->toArray());
    }

    /**
     * Tests moving a node with no lft and rght
     *
     * @return void
     */
    public function testMoveNoTreeColumns()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $node = $table->get(8);
        $node->unsetProperty('lft');
        $node->unsetProperty('rght');
        $node = $table->moveUp($node, true);
        $this->assertEquals(['lft' => 1, 'rght' => 2], $node->extract(['lft', 'rght']));
        $nodes = $table->find()
            ->select(['id'])
            ->where(function ($exp) {
                return $exp->isNull('parent_id');
            })
            ->where(['menu' => 'main-menu'])
            ->order(['lft' => 'ASC'])
            ->all();
        $this->assertEquals([8, 1, 6], $nodes->extract('id')->toArray());
    }

    /**
     * Tests the moveDown() method
     *
     * @return void
     */
    public function testMoveDown()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        // latest node, won't move
        $node = $this->table->moveDown($table->get(8), 10);
        $this->assertEquals(['lft' => 21, 'rght' => 22], $node->extract(['lft', 'rght']));

        // edge cases
        $this->assertFalse($this->table->moveDown($table->get(8), 0));

        // move inner node
        $node = $table->moveDown($table->get(2), 1);
        $nodes = $table->find('children', ['for' => 1])->all();
        $this->assertEquals([3, 4, 5, 2], $nodes->extract('id')->toArray());
        $this->assertEquals(['lft' => 11, 'rght' => 12], $node->extract(['lft', 'rght']));
    }

    /**
     * Tests moving a node that has no siblings
     *
     * @return void
     */
    public function testMoveLeafDown()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $node = $table->moveDown($table->get(5), 1);
        $this->assertEquals(['lft' => 6, 'rght' => 7], $node->extract(['lft', 'rght']));
    }

    /**
     * Tests moving a node to the bottom
     *
     * @return void
     */
    public function testMoveToBottom()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $node = $table->moveDown($table->get(1), true);
        $this->assertEquals(['lft' => 7, 'rght' => 16], $node->extract(['lft', 'rght']));
        $nodes = $table->find()
            ->select(['id'])
            ->where(function ($exp) {
                return $exp->isNull('parent_id');
            })
            ->where(['menu' => 'main-menu'])
            ->order(['lft' => 'ASC'])
            ->all();
        $this->assertEquals([6, 8, 1], $nodes->extract('id')->toArray());
    }

    /**
     * Tests moving a node with no lft and rght columns
     *
     * @return void
     */
    public function testMoveDownNoTreeColumns()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $node = $table->get(1);
        $node->unsetProperty('lft');
        $node->unsetProperty('rght');
        $node = $table->moveDown($node, true);
        $this->assertEquals(['lft' => 7, 'rght' => 16], $node->extract(['lft', 'rght']));
        $nodes = $table->find()
            ->select(['id'])
            ->where(function ($exp) {
                return $exp->isNull('parent_id');
            })
            ->where(['menu' => 'main-menu'])
            ->order(['lft' => 'ASC'])
            ->all();
        $this->assertEquals([6, 8, 1], $nodes->extract('id')->toArray());
    }

    /**
     * Tests the recover function
     *
     * @return void
     */
    public function testRecover()
    {
        $table = $this->table;
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->updateAll(['lft' => null, 'rght' => null], []);
        $table->recover();
        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Tests the recover function with a custom scope
     *
     * @return void
     */
    public function testRecoverScoped()
    {
        $table = TableRegistry::get('MenuLinkTrees');
        $table->addBehavior('Tree', ['scope' => ['menu' => 'main-menu']]);
        $expected = $table->find()
            ->where(['menu' => 'main-menu'])
            ->order('lft')
            ->hydrate(false)
            ->toArray();

        $expected2 = $table->find()
            ->where(['menu' => 'categories'])
            ->order('lft')
            ->hydrate(false)
            ->toArray();

        $table->updateAll(['lft' => null, 'rght' => null], ['menu' => 'main-menu']);
        $table->recover();
        $result = $table->find()
            ->where(['menu' => 'main-menu'])
            ->order('lft')
            ->hydrate(false)
            ->toArray();
        $this->assertEquals($expected, $result);

        $result2 = $table->find()
            ->where(['menu' => 'categories'])
            ->order('lft')
            ->hydrate(false)
            ->toArray();
        $this->assertEquals($expected2, $result2);
    }

    /**
     * Tests adding a new orphan node
     *
     * @return void
     */
    public function testAddOrphan()
    {
        $table = $this->table;
        $entity = new Entity(
            ['name' => 'New Orphan', 'parent_id' => null],
            ['markNew' => true]
        );
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(23, $entity->lft);
        $this->assertEquals(24, $entity->rght);

        $expected[] = $entity->toArray();
        $results = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $results);
    }

    /**
     * Tests that adding a child node as a decendant of one of the roots works
     *
     * @return void
     */
    public function testAddMiddle()
    {
        $table = $this->table;
        $entity = new Entity(
            ['name' => 'laptops', 'parent_id' => 1],
            ['markNew' => true]
        );
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(20, $entity->lft);
        $this->assertEquals(21, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Tests adding a leaf to the tree
     *
     * @return void
     */
    public function testAddLeaf()
    {
        $table = $this->table;
        $entity = new Entity(
            ['name' => 'laptops', 'parent_id' => 2],
            ['markNew' => true]
        );
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(9, $entity->lft);
        $this->assertEquals(10, $entity->rght);

        $results = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $results);
    }

    /**
     * Tests moving a subtree to the right
     *
     * @return void
     */
    public function testReParentSubTreeRight()
    {
        $table = $this->table;
        $entity = $table->get(2);
        $entity->parent_id = 6;
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(11, $entity->lft);
        $this->assertEquals(18, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false);
        $expected = [1, 6, 7, 8, 9, 10, 2, 3, 4, 5, 11];
        $this->assertTreeNumbers($expected, $table);
    }

    /**
     * Tests moving a subtree to the left
     *
     * @return void
     */
    public function testReParentSubTreeLeft()
    {
        $table = $this->table;
        $entity = $table->get(6);
        $entity->parent_id = 2;
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(9, $entity->lft);
        $this->assertEquals(18, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Test moving a leaft to the left
     *
     * @return void
     */
    public function testReParentLeafLeft()
    {
        $table = $this->table;
        $entity = $table->get(10);
        $entity->parent_id = 2;
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(9, $entity->lft);
        $this->assertEquals(10, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Test moving a leaf to the left
     *
     * @return void
     */
    public function testReParentLeafRight()
    {
        $table = $this->table;
        $entity = $table->get(5);
        $entity->parent_id = 6;
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(17, $entity->lft);
        $this->assertEquals(18, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false);
        $expected = [1, 2, 3, 4, 6, 7, 8, 9, 10, 5, 11];
        $this->assertTreeNumbers($expected, $table);
    }

    /**
     * Tests moving a subtree with a node having no lft and rght columns
     *
     * @return void
     */
    public function testReParentNoTreeColumns()
    {
        $table = $this->table;
        $entity = $table->get(6);
        $entity->unsetProperty('lft');
        $entity->unsetProperty('rght');
        $entity->parent_id = 2;
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(9, $entity->lft);
        $this->assertEquals(18, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Tests moving a subtree as a new root
     *
     * @return void
     */
    public function testRootingSubTree()
    {
        $table = $this->table;
        $entity = $table->get(2);
        $entity->parent_id = null;
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(15, $entity->lft);
        $this->assertEquals(22, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false);
        $expected = [1, 6, 7, 8, 9, 10, 11, 2, 3, 4, 5];
        $this->assertTreeNumbers($expected, $table);
    }

    /**
     * Tests moving a subtree with no tree columns
     *
     * @return void
     */
    public function testRootingNoTreeColumns()
    {
        $table = $this->table;
        $entity = $table->get(2);
        $entity->unsetProperty('lft');
        $entity->unsetProperty('rght');
        $entity->parent_id = null;
        $this->assertSame($entity, $table->save($entity));
        $this->assertEquals(15, $entity->lft);
        $this->assertEquals(22, $entity->rght);

        $result = $table->find()->order('lft')->hydrate(false);
        $expected = [1, 6, 7, 8, 9, 10, 11, 2, 3, 4, 5];
        $this->assertTreeNumbers($expected, $table);
    }

    /**
     * Tests that trying to create a cycle throws an exception
     *
     * @expectedException \RuntimeException
     * @expectedExceptionMessage Cannot use node "5" as parent for entity "2"
     * @return void
     */
    public function testReparentCycle()
    {
        $table = $this->table;
        $entity = $table->get(2);
        $entity->parent_id = 5;
        $table->save($entity);
    }

    /**
     * Tests deleting a leaf in the tree
     *
     * @return void
     */
    public function testDeleteLeaf()
    {
        $table = $this->table;
        $entity = $table->get(4);
        $this->assertTrue($table->delete($entity));
        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Tests deleting a subtree
     *
     * @return void
     */
    public function testDeleteSubTree()
    {
        $table = $this->table;
        $entity = $table->get(6);
        $this->assertTrue($table->delete($entity));
        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Test deleting a root node
     *
     * @return void
     */
    public function testDeleteRoot()
    {
        $table = $this->table;
        $entity = $table->get(1);
        $this->assertTrue($table->delete($entity));
        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Test deleting a node with no tree columns
     *
     * @return void
     */
    public function testDeleteRootNoTreeColumns()
    {
        $table = $this->table;
        $entity = $table->get(1);
        $entity->unsetProperty('lft');
        $entity->unsetProperty('rght');
        $this->assertTrue($table->delete($entity));
        $result = $table->find()->order('lft')->hydrate(false)->toArray();
        $table->recover();
        $expected = $table->find()->order('lft')->hydrate(false)->toArray();
        $this->assertEquals($expected, $result);
    }

    /**
     * Tests that a leaf can be taken out of the tree and put in as a root
     *
     * @return void
     */
    public function testRemoveFromLeafFromTree()
    {
        $table = $this->table;
        $entity = $table->get(10);
        $this->assertSame($entity, $table->removeFromTree($entity));
        $this->assertEquals(21, $entity->lft);
        $this->assertEquals(22, $entity->rght);
        $this->assertEquals(null, $entity->parent_id);
        $result = $table->find()->order('lft')->hydrate(false);
        $expected = [1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 10];
        $this->assertTreeNumbers($expected, $table);
    }

    /**
     * Test removing a middle node from a tree
     *
     * @return void
     */
    public function testRemoveMiddleNodeFromTree()
    {
        $table = $this->table;
        $entity = $table->get(6);
        $this->assertSame($entity, $table->removeFromTree($entity));
        $result = $table->find('threaded')->order('lft')->hydrate(false)->toArray();
        $this->assertEquals(21, $entity->lft);
        $this->assertEquals(22, $entity->rght);
        $this->assertEquals(null, $entity->parent_id);
        $result = $table->find()->order('lft')->hydrate(false);
        $expected = [1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 6];
        $this->assertTreeNumbers($expected, $table);
    }

    /**
     * Tests removing the root of a tree
     *
     * @return void
     */
    public function testRemoveRootFromTree()
    {
        $table = $this->table;
        $entity = $table->get(1);
        $this->assertSame($entity, $table->removeFromTree($entity));
        $result = $table->find('threaded')->order('lft')->hydrate(false)->toArray();
        $this->assertEquals(21, $entity->lft);
        $this->assertEquals(22, $entity->rght);
        $this->assertEquals(null, $entity->parent_id);
        $expected = [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1];
        $this->assertTreeNumbers($expected, $table);
    }

    /**
     * Tests that using associations having tree fields in the schema
     * does not generate SQL errors
     *
     * @return void
     */
    public function testFindPathWithAssociation()
    {
        $table = $this->table;
        $other = TableRegistry::get('FriendlyTrees', [
            'table' => $table->table()
        ]);
        $table->hasOne('FriendlyTrees', [
            'foreignKey' => 'id'
        ]);
        $result = $table
            ->find('children', ['for' => 1])
            ->contain('FriendlyTrees')
            ->toArray();
        $this->assertCount(9, $result);
    }

    /**
     * Tests getting the depth level of a node in the tree.
     *
     * @return void
     */
    public function testGetLevel()
    {
        $entity = $this->table->get(8);
        $result = $this->table->getLevel($entity);
        $this->assertEquals(3, $result);

        $result = $this->table->getLevel($entity->id);
        $this->assertEquals(3, $result);

        $result = $this->table->getLevel(5);
        $this->assertEquals(2, $result);

        $result = $this->table->getLevel(99999);
        $this->assertFalse($result);
    }

    /**
     * Custom assertion use to verify tha a tree is returned in the expected order
     * and that it is still valid
     *
     * @param array $expected The list of ids in the order they are expected
     * @param \Cake\ORM\Table the table instance to use for comparing
     * @return void
     */
    public function assertTreeNumbers($expected, $table)
    {
        $result = $table->find()->order('lft')->hydrate(false);
        $this->assertEquals($expected, $result->extract('id')->toArray());
        $numbers = [];
        $result->each(function ($v) use (&$numbers) {
            $numbers[] = $v['lft'];
            $numbers[] = $v['rght'];
        });
        sort($numbers);
        $this->assertEquals(range(1, 22), $numbers);
    }
}