class TermHierarchyValidationTest

class TermHierarchyValidationTest extends EntityKernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'taxonomy',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installEntitySchema('taxonomy_term');
    }
    
    /**
     * Tests the term hierarchy validation with re-parenting in pending revisions.
     */
    public function testTermHierarchyValidation() {
        $vocabulary_id = mb_strtolower($this->randomMachineName());
        $vocabulary = Vocabulary::create([
            'name' => $vocabulary_id,
            'vid' => $vocabulary_id,
        ]);
        $vocabulary->save();
        // Create a simple hierarchy in the vocabulary, a root term and three parent
        // terms.
        
        /** @var \Drupal\Core\Entity\RevisionableStorageInterface $term_storage */
        $term_storage = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
        $root = $term_storage->create([
            'name' => $this->randomMachineName(),
            'vid' => $vocabulary_id,
        ]);
        $root->save();
        $parent1 = $term_storage->create([
            'name' => $this->randomMachineName(),
            'vid' => $vocabulary_id,
            'parent' => $root->id(),
        ]);
        $parent1->save();
        $parent2 = $term_storage->create([
            'name' => $this->randomMachineName(),
            'vid' => $vocabulary_id,
            'parent' => $root->id(),
        ]);
        $parent2->save();
        $parent3 = $term_storage->create([
            'name' => $this->randomMachineName(),
            'vid' => $vocabulary_id,
            'parent' => $root->id(),
        ]);
        $parent3->save();
        // Create a child term and assign one of the parents above.
        $child1 = $term_storage->create([
            'name' => $this->randomMachineName(),
            'vid' => $vocabulary_id,
            'parent' => $parent1->id(),
        ]);
        $violations = $child1->validate();
        $this->assertEmpty($violations);
        $child1->save();
        $validation_message = 'You can only change the hierarchy for the <em>published</em> version of this term.';
        // Add a pending revision without changing the term parent.
        $pending_name = $this->randomMachineName();
        $child_pending = $term_storage->createRevision($child1, FALSE);
        $child_pending->name = $pending_name;
        $violations = $child_pending->validate();
        $this->assertEmpty($violations);
        // Add a pending revision and change the parent.
        $child_pending = $term_storage->createRevision($child1, FALSE);
        $child_pending->parent = $parent2;
        $violations = $child_pending->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals('parent', $violations[0]->getPropertyPath());
        // Add a pending revision and add a new parent.
        $child_pending = $term_storage->createRevision($child1, FALSE);
        $child_pending->parent[0] = $parent1;
        $child_pending->parent[1] = $parent3;
        $violations = $child_pending->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals('parent', $violations[0]->getPropertyPath());
        // Add a pending revision and use the root term as a parent.
        $child_pending = $term_storage->createRevision($child1, FALSE);
        $child_pending->parent[0] = $root;
        $violations = $child_pending->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals('parent', $violations[0]->getPropertyPath());
        // Add a pending revision and remove the parent.
        $child_pending = $term_storage->createRevision($child1, FALSE);
        $child_pending->parent[0] = NULL;
        $violations = $child_pending->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals('parent', $violations[0]->getPropertyPath());
        // Add a pending revision and change the weight.
        $child_pending = $term_storage->createRevision($child1, FALSE);
        $child_pending->weight = 10;
        $violations = $child_pending->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals('weight', $violations[0]->getPropertyPath());
        // Add a pending revision and change both the parent and the weight.
        $child_pending = $term_storage->createRevision($child1, FALSE);
        $child_pending->parent = $parent2;
        $child_pending->weight = 10;
        $violations = $child_pending->validate();
        $this->assertCount(2, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals($validation_message, $violations[1]->getMessage());
        $this->assertEquals('parent', $violations[0]->getPropertyPath());
        $this->assertEquals('weight', $violations[1]->getPropertyPath());
        // Add a published revision and change the parent.
        $child_pending = $term_storage->createRevision($child1, TRUE);
        $child_pending->parent[0] = $parent2;
        $violations = $child_pending->validate();
        $this->assertEmpty($violations);
        // Add a new term as a third-level child.
        // The taxonomy tree structure ends up as follows:
        // root
        // - parent1
        // - parent2
        // -- child1 <- this will be a term with a pending revision
        // --- child2
        // - parent3
        $child2 = $term_storage->create([
            'name' => $this->randomMachineName(),
            'vid' => $vocabulary_id,
            'parent' => $child1->id(),
        ]);
        $child2->save();
        // Change 'child1' to be a pending revision.
        $child1 = $term_storage->createRevision($child1, FALSE);
        $child1->save();
        // Check that a child of a pending term can not be re-parented.
        $child2_pending = $term_storage->createRevision($child2, FALSE);
        $child2_pending->parent = $parent3;
        $violations = $child2_pending->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals('parent', $violations[0]->getPropertyPath());
        // Check that another term which has a pending revision can not moved under
        // another term which has pending revision.
        $parent3_pending = $term_storage->createRevision($parent3, FALSE);
        $parent3_pending->parent = $child1;
        $violations = $parent3_pending->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals($validation_message, $violations[0]->getMessage());
        $this->assertEquals('parent', $violations[0]->getPropertyPath());
        // Check that a new term can be created under a term that has a pending
        // revision.
        $child3 = $term_storage->create([
            'name' => $this->randomMachineName(),
            'vid' => $vocabulary_id,
            'parent' => $child1->id(),
        ]);
        $violations = $child3->validate();
        $this->assertEmpty($violations);
    }

}