class MigrateTaxonomyTermTest

class MigrateTaxonomyTermTest extends MigrateDrupal6TestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'comment',
        'taxonomy',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installEntitySchema('taxonomy_term');
        $this->executeMigrations([
            'd6_taxonomy_vocabulary',
            'd6_taxonomy_term',
        ]);
    }
    
    /**
     * Tests the Drupal 6 taxonomy term to Drupal 8 migration.
     */
    public function testTaxonomyTerms() : void {
        $expected_results = [
            '1' => [
                'source_vid' => 1,
                'vid' => 'vocabulary_1_i_0_',
                'weight' => 0,
                'parent' => [
                    0,
                ],
                'language' => 'zu',
            ],
            '2' => [
                'source_vid' => 2,
                'vid' => 'vocabulary_2_i_1_',
                'weight' => 3,
                'parent' => [
                    0,
                ],
                'language' => 'fr',
            ],
            '3' => [
                'source_vid' => 2,
                'vid' => 'vocabulary_2_i_1_',
                'weight' => 4,
                'parent' => [
                    2,
                ],
                'language' => 'fr',
            ],
            '4' => [
                'source_vid' => 3,
                'vid' => 'vocabulary_3_i_2_',
                'weight' => 6,
                'parent' => [
                    0,
                ],
            ],
            '5' => [
                'source_vid' => 3,
                'vid' => 'vocabulary_3_i_2_',
                'weight' => 7,
                'parent' => [
                    4,
                ],
            ],
            '6' => [
                'source_vid' => 3,
                'vid' => 'vocabulary_3_i_2_',
                'weight' => 8,
                'parent' => [
                    4,
                    5,
                ],
            ],
        ];
        $terms = Term::loadMultiple(array_keys($expected_results));
        // Find each term in the tree.
        $storage = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
        $vids = array_unique(array_column($expected_results, 'vid'));
        $tree_terms = [];
        foreach ($vids as $vid) {
            foreach ($storage->loadTree($vid) as $term) {
                $tree_terms[$term->tid] = $term;
            }
        }
        foreach ($expected_results as $tid => $values) {
            
            /** @var \Drupal\taxonomy\Entity\Term $term */
            $term = $terms[$tid];
            $language = isset($values['language']) ? $values['language'] . ' - ' : '';
            $this->assertSame("{$language}term {$tid} of vocabulary {$values['source_vid']}", $term->name->value);
            $this->assertSame("{$language}description of term {$tid} of vocabulary {$values['source_vid']}", $term->description->value);
            $this->assertSame($values['vid'], $term->vid->target_id);
            $this->assertSame((string) $values['weight'], $term->weight->value);
            if ($values['parent'] === [
                0,
            ]) {
                $this->assertSame(0, (int) $term->parent->target_id);
            }
            else {
                $parents = [];
                foreach (\Drupal::entityTypeManager()->getStorage('taxonomy_term')
                    ->loadParents($tid) as $parent) {
                    $parents[] = (int) $parent->id();
                }
                $this->assertSame($parents, $values['parent']);
            }
            $this->assertArrayHasKey($tid, $tree_terms, "Term {$tid} exists in vocabulary tree");
            $tree_term = $tree_terms[$tid];
            // PostgreSQL, MySQL and SQLite may not return the parent terms in the
            // same order so sort before testing.
            $expected_parents = $values['parent'];
            sort($expected_parents);
            $actual_parents = $tree_term->parents;
            sort($actual_parents);
            $this->assertEquals($expected_parents, $actual_parents, "Term {$tid} has correct parents in vocabulary tree");
        }
    }

}