class TaxonomyTestBase

abstract class TaxonomyTestBase extends ViewTestBase {
    use EntityReferenceFieldCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'taxonomy',
        'taxonomy_test_views',
    ];
    
    /**
     * Stores the nodes used for the different tests.
     *
     * @var \Drupal\node\NodeInterface[]
     */
    protected $nodes = [];
    
    /**
     * The vocabulary used for creating terms.
     *
     * @var \Drupal\taxonomy\VocabularyInterface
     */
    protected $vocabulary;
    
    /**
     * Stores the first term used in the different tests.
     *
     * @var \Drupal\taxonomy\TermInterface
     */
    protected $term1;
    
    /**
     * Stores the second term used in the different tests.
     *
     * @var \Drupal\taxonomy\TermInterface
     */
    protected $term2;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp($import_test_views = TRUE, $modules = []) : void {
        // Important: taxonomy_test_views module must not be in the $modules to
        // avoid an issue that particular view is already exists.
        parent::setUp($import_test_views, $modules);
        $this->mockStandardInstall();
        // This needs to be done again after ::mockStandardInstall() to make
        // test vocabularies available.
        // Explicitly add taxonomy_test_views to $modules now, so required views are
        // being created.
        $modules[] = 'taxonomy_test_views';
        if ($import_test_views) {
            ViewTestData::createTestViews(static::class, $modules);
        }
        $this->term1 = $this->createTerm();
        $this->term2 = $this->createTerm();
        $node = [];
        $node['type'] = 'article';
        $node['field_views_testing_tags'][]['target_id'] = $this->term1
            ->id();
        $node['field_views_testing_tags'][]['target_id'] = $this->term2
            ->id();
        $this->nodes[] = $this->drupalCreateNode($node);
        $this->nodes[] = $this->drupalCreateNode($node);
    }
    
    /**
     * Provides a workaround for the inability to use the standard profile.
     *
     * @see https://www.drupal.org/node/1708692
     */
    protected function mockStandardInstall() {
        $this->drupalCreateContentType([
            'type' => 'article',
        ]);
        // Create the vocabulary for the tag field.
        $this->vocabulary = Vocabulary::create([
            'name' => 'Views testing tags',
            'vid' => 'views_testing_tags',
        ]);
        $this->vocabulary
            ->save();
        $field_name = 'field_' . $this->vocabulary
            ->id();
        $handler_settings = [
            'target_bundles' => [
                $this->vocabulary
                    ->id() => $this->vocabulary
                    ->id(),
            ],
            'auto_create' => TRUE,
        ];
        $this->createEntityReferenceField('node', 'article', $field_name, 'Tags', 'taxonomy_term', 'default', $handler_settings, FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
        
        /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
        $display_repository = \Drupal::service('entity_display.repository');
        $display_repository->getFormDisplay('node', 'article')
            ->setComponent($field_name, [
            'type' => 'entity_reference_autocomplete_tags',
            'weight' => -4,
        ])
            ->save();
        $display_repository->getViewDisplay('node', 'article')
            ->setComponent($field_name, [
            'type' => 'entity_reference_label',
            'weight' => 10,
        ])
            ->save();
        $display_repository->getViewDisplay('node', 'article', 'teaser')
            ->setComponent($field_name, [
            'type' => 'entity_reference_label',
            'weight' => 10,
        ])
            ->save();
    }
    
    /**
     * Creates and returns a taxonomy term.
     *
     * @param array $settings
     *   (optional) An array of values to override the following default
     *   properties of the term:
     *   - name: A random string.
     *   - description: A random string.
     *   - format: First available text format.
     *   - vid: Vocabulary ID of self::$vocabulary object.
     *   - langcode: LANGCODE_NOT_SPECIFIED.
     *   Defaults to an empty array.
     *
     * @return \Drupal\taxonomy\Entity\Term
     *   The created taxonomy term.
     */
    protected function createTerm(array $settings = []) {
        $filter_formats = filter_formats();
        $format = array_pop($filter_formats);
        $settings += [
            'name' => $this->randomMachineName(),
            'description' => $this->randomMachineName(),
            // Use the first available text format.
'format' => $format->id(),
            'vid' => $this->vocabulary
                ->id(),
            'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
        ];
        $term = Term::create($settings);
        $term->save();
        return $term;
    }

}