View source  
  <?php
namespace Drupal\Tests\taxonomy\Functional\Views;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\Language\LanguageInterface;
use Drupal\Tests\field\Traits\EntityReferenceTestTrait;
use Drupal\Tests\views\Functional\ViewTestBase;
use Drupal\views\Tests\ViewTestData;
use Drupal\taxonomy\Entity\Vocabulary;
use Drupal\taxonomy\Entity\Term;
abstract class TaxonomyTestBase extends ViewTestBase {
  use EntityReferenceTestTrait;
  
  public static $modules = [
    'taxonomy',
    'taxonomy_test_views',
  ];
  
  protected $nodes = [];
  
  protected $vocabulary;
  
  protected $term1;
  
  protected $term2;
  
  protected function setUp($import_test_views = TRUE) {
    parent::setUp($import_test_views);
    $this
      ->mockStandardInstall();
    if ($import_test_views) {
      ViewTestData::createTestViews(get_class($this), [
        'taxonomy_test_views',
      ]);
    }
    $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);
  }
  
  protected function mockStandardInstall() {
    $this
      ->drupalCreateContentType([
      'type' => 'article',
    ]);
    
    $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);
    
    $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();
  }
  
  protected function createTerm(array $settings = []) {
    $filter_formats = filter_formats();
    $format = array_pop($filter_formats);
    $settings += [
      'name' => $this
        ->randomMachineName(),
      'description' => $this
        ->randomMachineName(),
      
      'format' => $format
        ->id(),
      'vid' => $this->vocabulary
        ->id(),
      'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
    ];
    $term = Term::create($settings);
    $term
      ->save();
    return $term;
  }
}