class TaxonomyTermReferenceItemTest

class TaxonomyTermReferenceItemTest extends FieldUnitTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array(
    'taxonomy',
    'options',
  );
  public static function getInfo() {
    return array(
      'name' => 'Taxonomy reference field item',
      'description' => 'Tests using entity fields of the taxonomy term reference field type.',
      'group' => 'Taxonomy',
    );
  }
  public function setUp() {
    parent::setUp();
    $this
      ->installSchema('taxonomy', 'taxonomy_term_data');
    $this
      ->installSchema('taxonomy', 'taxonomy_term_hierarchy');
    $vocabulary = entity_create('taxonomy_vocabulary', array(
      'name' => $this
        ->randomName(),
      'vid' => drupal_strtolower($this
        ->randomName()),
      'langcode' => Language::LANGCODE_NOT_SPECIFIED,
    ));
    $vocabulary
      ->save();
    $field = array(
      'field_name' => 'field_test_taxonomy',
      'type' => 'taxonomy_term_reference',
      'cardinality' => FIELD_CARDINALITY_UNLIMITED,
      'settings' => array(
        'allowed_values' => array(
          array(
            'vocabulary' => $vocabulary
              ->id(),
            'parent' => 0,
          ),
        ),
      ),
    );
    field_create_field($field);
    $instance = array(
      'entity_type' => 'entity_test',
      'field_name' => 'field_test_taxonomy',
      'bundle' => 'entity_test',
    );
    field_create_instance($instance);
    $this->term = entity_create('taxonomy_term', array(
      'name' => $this
        ->randomName(),
      'vid' => $vocabulary
        ->id(),
      'langcode' => Language::LANGCODE_NOT_SPECIFIED,
    ));
    $this->term
      ->save();
  }

  /**
   * Tests using entity fields of the taxonomy term reference field type.
   */
  public function testTaxonomyTermReferenceItem() {
    $tid = $this->term
      ->id();

    // Just being able to create the entity like this verifies a lot of code.
    $entity = entity_create('entity_test', array());
    $entity->field_test_taxonomy->tid = $this->term
      ->id();
    $entity->name->value = $this
      ->randomName();
    $entity
      ->save();
    $entity = entity_load('entity_test', $entity
      ->id());
    $this
      ->assertTrue($entity->field_test_taxonomy instanceof FieldInterface, 'Field implements interface.');
    $this
      ->assertTrue($entity->field_test_taxonomy[0] instanceof FieldItemInterface, 'Field item implements interface.');
    $this
      ->assertEqual($entity->field_test_taxonomy->tid, $this->term
      ->id());
    $this
      ->assertEqual($entity->field_test_taxonomy->entity->name->value, $this->term->name->value);
    $this
      ->assertEqual($entity->field_test_taxonomy->entity
      ->id(), $tid);
    $this
      ->assertEqual($entity->field_test_taxonomy->entity
      ->uuid(), $this->term
      ->uuid());

    // Change the name of the term via the reference.
    $new_name = $this
      ->randomName();
    $entity->field_test_taxonomy->entity->name = $new_name;
    $entity->field_test_taxonomy->entity
      ->save();

    // Verify it is the correct name.
    $term = entity_load('taxonomy_term', $tid);
    $this
      ->assertEqual($term->name->value, $new_name);

    // Make sure the computed term reflects updates to the term id.
    $term2 = entity_create('taxonomy_term', array(
      'name' => $this
        ->randomName(),
      'vid' => $this->term->vid->value,
      'langcode' => Language::LANGCODE_NOT_SPECIFIED,
    ));
    $term2
      ->save();
    $entity->field_test_taxonomy->tid = $term2
      ->id();
    $this
      ->assertEqual($entity->field_test_taxonomy->entity
      ->id(), $term2
      ->id());
    $this
      ->assertEqual($entity->field_test_taxonomy->entity->name->value, $term2->name->value);
  }

}