class EntityFieldTest in Drupal 10

Tests the Entity Field API.

@group Entity

Hierarchy

• class \Drupal\KernelTests\KernelTestBase extends \PHPUnit\Framework\TestCase implements ServiceProviderInterface uses \Drupal\Tests\PhpUnitCompatibilityTrait, \Symfony\Bridge\PhpUnit\ExpectDeprecationTrait, AssertContentTrait, ConfigTestTrait, ExtensionListTestTrait, RandomGeneratorTrait, TestRequirementsTrait, PhpUnitWarnings
  • class \Drupal\KernelTests\Core\Entity\EntityKernelTestBase uses UserCreationTrait
    • class \Drupal\KernelTests\Core\Entity\EntityFieldTest

File

core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php, line 32

Namespace

Drupal\KernelTests\Core\Entity

class EntityFieldTest extends EntityKernelTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'filter',
    'text',
    'node',
    'user',
    'field_test',
  ];

  /**
   * @var string
   */
  protected $entityName;

  /**
   * @var \Drupal\user\Entity\User
   */
  protected $entityUser;

  /**
   * @var string
   */
  protected $entityFieldText;
  protected function setUp() : void {
    parent::setUp();
    foreach (entity_test_entity_types() as $entity_type_id) {

      // The entity_test schema is installed by the parent.
      if ($entity_type_id != 'entity_test') {
        $this
          ->installEntitySchema($entity_type_id);
      }
    }

    // Create the test field.
    $this->container
      ->get('module_handler')
      ->loadInclude('entity_test', 'install');
    entity_test_install();

    // Install required default configuration for filter module.
    $this
      ->installConfig([
      'system',
      'filter',
    ]);
  }

  /**
   * Creates a test entity.
   *
   * @return \Drupal\Core\Entity\EntityInterface
   */
  protected function createTestEntity($entity_type) {
    $this->entityName = $this
      ->randomMachineName();
    $this->entityUser = $this
      ->createUser();
    $this->entityFieldText = $this
      ->randomMachineName();

    // Pass in the value of the name field when creating. With the user
    // field we test setting a field after creation.
    $entity = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->create();
    $entity->user_id->target_id = $this->entityUser
      ->id();
    $entity->name->value = $this->entityName;

    // Set a value for the test field.
    $entity->field_test_text->value = $this->entityFieldText;
    return $entity;
  }

  /**
   * Tests reading and writing properties and field items.
   */
  public function testReadWrite() {

    // All entity variations have to have the same results.
    foreach (entity_test_entity_types() as $entity_type) {
      $this
        ->doTestReadWrite($entity_type);
    }
  }

  /**
   * Executes the read write test set for a defined entity type.
   *
   * @param string $entity_type
   *   The entity type to run the tests with.
   */
  protected function doTestReadWrite($entity_type) {
    $entity = $this
      ->createTestEntity($entity_type);
    $langcode = 'en';

    // Access the name field.
    $this
      ->assertInstanceOf(FieldItemListInterface::class, $entity->name);
    $this
      ->assertInstanceOf(FieldItemInterface::class, $entity->name[0]);
    $this
      ->assertEquals($this->entityName, $entity->name->value, new FormattableMarkup('%entity_type: Name value can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityName, $entity->name[0]->value, new FormattableMarkup('%entity_type: Name value can be read through list access.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals([
      0 => [
        'value' => $this->entityName,
      ],
    ], $entity->name
      ->getValue(), new FormattableMarkup('%entity_type: Plain field value returned.', [
      '%entity_type' => $entity_type,
    ]));

    // Change the name.
    $new_name = $this
      ->randomMachineName();
    $entity->name->value = $new_name;
    $this
      ->assertEquals($new_name, $entity->name->value, new FormattableMarkup('%entity_type: Name can be updated and read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals([
      0 => [
        'value' => $new_name,
      ],
    ], $entity->name
      ->getValue(), new FormattableMarkup('%entity_type: Plain field value reflects the update.', [
      '%entity_type' => $entity_type,
    ]));
    $new_name = $this
      ->randomMachineName();
    $entity->name[0]->value = $new_name;
    $this
      ->assertEquals($new_name, $entity->name->value, new FormattableMarkup('%entity_type: Name can be updated and read through list access.', [
      '%entity_type' => $entity_type,
    ]));

    // Access the user field.
    $this
      ->assertInstanceOf(FieldItemListInterface::class, $entity->user_id);
    $this
      ->assertInstanceOf(FieldItemInterface::class, $entity->user_id[0]);
    $this
      ->assertEquals($this->entityUser
      ->id(), $entity->user_id->target_id, new FormattableMarkup('%entity_type: User id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityUser
      ->getAccountName(), $entity->user_id->entity->name->value, new FormattableMarkup('%entity_type: User name can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Change the assigned user by entity.
    $new_user1 = $this
      ->createUser();
    $entity->user_id->entity = $new_user1;
    $this
      ->assertEquals($new_user1
      ->id(), $entity->user_id->target_id, new FormattableMarkup('%entity_type: Updated user id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($new_user1
      ->getAccountName(), $entity->user_id->entity->name->value, new FormattableMarkup('%entity_type: Updated username value can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Change the assigned user by id.
    $new_user2 = $this
      ->createUser();
    $entity->user_id->target_id = $new_user2
      ->id();
    $this
      ->assertEquals($new_user2
      ->id(), $entity->user_id->target_id, new FormattableMarkup('%entity_type: Updated user id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($new_user2
      ->getAccountName(), $entity->user_id->entity->name->value, new FormattableMarkup('%entity_type: Updated username value can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Try unsetting a field property.
    $entity->name->value = NULL;
    $entity->user_id->target_id = NULL;
    $this
      ->assertNull($entity->name->value, new FormattableMarkup('%entity_type: Name field is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertNull($entity->user_id->target_id, new FormattableMarkup('%entity_type: User ID field is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertNull($entity->user_id->entity, new FormattableMarkup('%entity_type: User entity field is not set.', [
      '%entity_type' => $entity_type,
    ]));

    // Test setting the values via the typed data API works as well.
    // Change the assigned user by entity.
    $entity->user_id
      ->first()
      ->get('entity')
      ->setValue($new_user2);
    $this
      ->assertEquals($new_user2
      ->id(), $entity->user_id->target_id, new FormattableMarkup('%entity_type: Updated user id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($new_user2
      ->getAccountName(), $entity->user_id->entity->name->value, new FormattableMarkup('%entity_type: Updated user name value can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Change the assigned user by id.
    $entity->user_id
      ->first()
      ->get('target_id')
      ->setValue($new_user2
      ->id());
    $this
      ->assertEquals($new_user2
      ->id(), $entity->user_id->target_id, new FormattableMarkup('%entity_type: Updated user id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($new_user2
      ->getAccountName(), $entity->user_id->entity->name->value, new FormattableMarkup('%entity_type: Updated user name value can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Try unsetting a field.
    $entity->name
      ->first()
      ->get('value')
      ->setValue(NULL);
    $entity->user_id
      ->first()
      ->get('target_id')
      ->setValue(NULL);
    $this
      ->assertNull($entity->name->value, new FormattableMarkup('%entity_type: Name field is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertNull($entity->user_id->target_id, new FormattableMarkup('%entity_type: User ID field is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertNull($entity->user_id->entity, new FormattableMarkup('%entity_type: User entity field is not set.', [
      '%entity_type' => $entity_type,
    ]));

    // Create a fresh entity so target_id does not get its property object
    // instantiated, then verify setting a new value via typed data API works.
    $entity2 = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->create([
      'user_id' => [
        'target_id' => $new_user1
          ->id(),
      ],
    ]);

    // Access the property object, and set a value.
    $entity2->user_id
      ->first()
      ->get('target_id')
      ->setValue($new_user2
      ->id());
    $this
      ->assertEquals($new_user2
      ->id(), $entity2->user_id->target_id, new FormattableMarkup('%entity_type: Updated user id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($new_user2->name->value, $entity2->user_id->entity->name->value, new FormattableMarkup('%entity_type: Updated user name value can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Test using isset(), empty() and unset().
    $entity->name->value = 'test unset';
    unset($entity->name->value);
    $this
      ->assertFalse(isset($entity->name->value), new FormattableMarkup('%entity_type: Name is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertFalse(isset($entity->name[0]->value), new FormattableMarkup('%entity_type: Name is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEmpty($entity->name->value, new FormattableMarkup('%entity_type: Name is empty.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEmpty($entity->name[0]->value, new FormattableMarkup('%entity_type: Name is empty.', [
      '%entity_type' => $entity_type,
    ]));
    $entity->name->value = 'a value';
    $this
      ->assertTrue(isset($entity->name->value), new FormattableMarkup('%entity_type: Name is set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertTrue(isset($entity->name[0]->value), new FormattableMarkup('%entity_type: Name is set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertNotEmpty($entity->name->value, new FormattableMarkup('%entity_type: Name is not empty.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertNotEmpty($entity->name[0]->value, new FormattableMarkup('%entity_type: Name is not empty.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertTrue(isset($entity->name[0]), new FormattableMarkup('%entity_type: Name string item is set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertFalse(isset($entity->name[1]), new FormattableMarkup('%entity_type: Second name string item is not set as it does not exist', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertTrue(isset($entity->name), new FormattableMarkup('%entity_type: Name field is set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertFalse(isset($entity->nameInvalid), new FormattableMarkup('%entity_type: Non-existent field is not set.', [
      '%entity_type' => $entity_type,
    ]));
    unset($entity->name[0]);
    $this
      ->assertFalse(isset($entity->name[0]), new FormattableMarkup('%entity_type: Name field item is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertFalse(isset($entity->name[0]->value), new FormattableMarkup('%entity_type: Name is not set.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertFalse(isset($entity->name->value), new FormattableMarkup('%entity_type: Name is not set.', [
      '%entity_type' => $entity_type,
    ]));

    // Test emptying a field by assigning an empty value. NULL and array()
    // behave the same.
    foreach ([
      NULL,
      [],
      'unset',
    ] as $empty) {

      // Make sure a value is present
      $entity->name->value = 'a value';
      $this
        ->assertTrue(isset($entity->name->value), new FormattableMarkup('%entity_type: Name is set.', [
        '%entity_type' => $entity_type,
      ]));

      // Now, empty the field.
      if ($empty === 'unset') {
        unset($entity->name);
      }
      else {
        $entity->name = $empty;
      }
      $this
        ->assertTrue(isset($entity->name), new FormattableMarkup('%entity_type: Name field is set.', [
        '%entity_type' => $entity_type,
      ]));
      $this
        ->assertTrue($entity->name
        ->isEmpty(), new FormattableMarkup('%entity_type: Name field is set.', [
        '%entity_type' => $entity_type,
      ]));
      $this
        ->assertCount(0, $entity->name, new FormattableMarkup('%entity_type: Name field contains no items.', [
        '%entity_type' => $entity_type,
      ]));
      $this
        ->assertSame([], $entity->name
        ->getValue(), new FormattableMarkup('%entity_type: Name field value is an empty array.', [
        '%entity_type' => $entity_type,
      ]));
      $this
        ->assertFalse(isset($entity->name[0]), new FormattableMarkup('%entity_type: Name field item is not set.', [
        '%entity_type' => $entity_type,
      ]));
      $this
        ->assertFalse(isset($entity->name[0]->value), new FormattableMarkup('%entity_type: First name item value is not set.', [
        '%entity_type' => $entity_type,
      ]));
      $this
        ->assertFalse(isset($entity->name->value), new FormattableMarkup('%entity_type: Name value is not set.', [
        '%entity_type' => $entity_type,
      ]));
    }

    // Access the language field.
    $langcode_key = $this->entityTypeManager
      ->getDefinition($entity_type)
      ->getKey('langcode');
    $this
      ->assertEquals($langcode, $entity->{$langcode_key}->value, new FormattableMarkup('%entity_type: Language code can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals(\Drupal::languageManager()
      ->getLanguage($langcode), $entity->{$langcode_key}->language, new FormattableMarkup('%entity_type: Language object can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Change the language by code.
    $entity->{$langcode_key}->value = \Drupal::languageManager()
      ->getDefaultLanguage()
      ->getId();
    $this
      ->assertEquals(\Drupal::languageManager()
      ->getDefaultLanguage()
      ->getId(), $entity->{$langcode_key}->value, new FormattableMarkup('%entity_type: Language code can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals(\Drupal::languageManager()
      ->getDefaultLanguage(), $entity->{$langcode_key}->language, new FormattableMarkup('%entity_type: Language object can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Revert language by code then try setting it by language object.
    $entity->{$langcode_key}->value = $langcode;
    $entity->{$langcode_key}->language = \Drupal::languageManager()
      ->getDefaultLanguage();
    $this
      ->assertEquals(\Drupal::languageManager()
      ->getDefaultLanguage()
      ->getId(), $entity->{$langcode_key}->value, new FormattableMarkup('%entity_type: Language code can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals(\Drupal::languageManager()
      ->getDefaultLanguage(), $entity->{$langcode_key}->language, new FormattableMarkup('%entity_type: Language object can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Access the text field and test updating.
    $this
      ->assertEquals($this->entityFieldText, $entity->field_test_text->value, new FormattableMarkup('%entity_type: Text field can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $new_text = $this
      ->randomMachineName();
    $entity->field_test_text->value = $new_text;
    $this
      ->assertEquals($new_text, $entity->field_test_text->value, new FormattableMarkup('%entity_type: Updated text field can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Test creating the entity by passing in plain values.
    $this->entityName = $this
      ->randomMachineName();
    $name_item[0]['value'] = $this->entityName;
    $this->entityUser = $this
      ->createUser();
    $user_item[0]['target_id'] = $this->entityUser
      ->id();
    $this->entityFieldText = $this
      ->randomMachineName();
    $text_item[0]['value'] = $this->entityFieldText;
    $entity = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->create([
      'name' => $name_item,
      'user_id' => $user_item,
      'field_test_text' => $text_item,
    ]);
    $this
      ->assertEquals($this->entityName, $entity->name->value, new FormattableMarkup('%entity_type: Name value can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityUser
      ->id(), $entity->user_id->target_id, new FormattableMarkup('%entity_type: User id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityUser
      ->getAccountName(), $entity->user_id->entity->name->value, new FormattableMarkup('%entity_type: User name can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityFieldText, $entity->field_test_text->value, new FormattableMarkup('%entity_type: Text field can be read.', [
      '%entity_type' => $entity_type,
    ]));

    // Tests copying field values by assigning the TypedData objects.
    $entity2 = $this
      ->createTestEntity($entity_type);
    $entity2->name = $entity->name;
    $entity2->user_id = $entity->user_id;
    $entity2->field_test_text = $entity->field_test_text;
    $this
      ->assertNotSame($entity->name, $entity2->name, new FormattableMarkup('%entity_type: Copying properties results in a different field object.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($entity->name->value, $entity2->name->value, new FormattableMarkup('%entity_type: Name field copied.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($entity->user_id->target_id, $entity2->user_id->target_id, new FormattableMarkup('%entity_type: User id field copied.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($entity->field_test_text->value, $entity2->field_test_text->value, new FormattableMarkup('%entity_type: Text field copied.', [
      '%entity_type' => $entity_type,
    ]));

    // Tests that assigning TypedData objects to non-field properties keeps the
    // assigned value as is.
    $entity2 = $this
      ->createTestEntity($entity_type);
    $entity2->_not_a_field = $entity->name;
    $this
      ->assertSame($entity->name, $entity2->_not_a_field, new FormattableMarkup('%entity_type: Typed data objects can be copied to non-field properties as is.', [
      '%entity_type' => $entity_type,
    ]));

    // Tests adding a value to a field item list.
    $entity->name[] = 'Another name';
    $this
      ->assertEquals('Another name', $entity->name[1]->value, new FormattableMarkup('%entity_type: List item added via [] and the first property.', [
      '%entity_type' => $entity_type,
    ]));
    $entity->name[] = [
      'value' => 'Third name',
    ];
    $this
      ->assertEquals('Third name', $entity->name[2]->value, new FormattableMarkup('%entity_type: List item added via [] and an array of properties.', [
      '%entity_type' => $entity_type,
    ]));
    $entity->name[3] = [
      'value' => 'Fourth name',
    ];
    $this
      ->assertEquals('Fourth name', $entity->name[3]->value, new FormattableMarkup('%entity_type: List item added via offset and an array of properties.', [
      '%entity_type' => $entity_type,
    ]));
    unset($entity->name[3]);

    // Test removing and empty-ing list items.
    $this
      ->assertCount(3, $entity->name, new FormattableMarkup('%entity_type: List has 3 items.', [
      '%entity_type' => $entity_type,
    ]));
    unset($entity->name[1]);
    $this
      ->assertCount(2, $entity->name, new FormattableMarkup('%entity_type: Second list item has been removed.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals('Third name', $entity->name[1]->value, new FormattableMarkup('%entity_type: The subsequent items have been shifted up.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals(1, $entity->name[1]
      ->getName(), new FormattableMarkup('%entity_type: The items names have been updated to their new delta.', [
      '%entity_type' => $entity_type,
    ]));
    $entity->name[1] = NULL;
    $this
      ->assertCount(2, $entity->name, new FormattableMarkup('%entity_type: Assigning NULL does not reduce array count.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertTrue($entity->name[1]
      ->isEmpty(), new FormattableMarkup('%entity_type: Assigning NULL empties the item.', [
      '%entity_type' => $entity_type,
    ]));

    // Test using isEmpty().
    unset($entity->name[1]);
    $this
      ->assertFalse($entity->name[0]
      ->isEmpty(), new FormattableMarkup('%entity_type: Name item is not empty.', [
      '%entity_type' => $entity_type,
    ]));
    $entity->name->value = NULL;
    $this
      ->assertTrue($entity->name[0]
      ->isEmpty(), new FormattableMarkup('%entity_type: Name item is empty.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertTrue($entity->name
      ->isEmpty(), new FormattableMarkup('%entity_type: Name field is empty.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertCount(1, $entity->name, new FormattableMarkup('%entity_type: Empty item is considered when counting.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertCount(1, iterator_to_array($entity->name
      ->getIterator()), new FormattableMarkup('%entity_type: Count matches iterator count.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertSame([
      0 => [
        'value' => NULL,
      ],
    ], $entity->name
      ->getValue(), new FormattableMarkup('%entity_type: Name field value contains a NULL value.', [
      '%entity_type' => $entity_type,
    ]));

    // Test using filterEmptyItems().
    $entity->name = [
      NULL,
      'foo',
    ];
    $this
      ->assertCount(2, $entity->name, new FormattableMarkup('%entity_type: List has 2 items.', [
      '%entity_type' => $entity_type,
    ]));
    $entity->name
      ->filterEmptyItems();
    $this
      ->assertCount(1, $entity->name, new FormattableMarkup('%entity_type: The empty item was removed.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals('foo', $entity->name[0]->value, new FormattableMarkup('%entity_type: The items were renumbered.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals(0, $entity->name[0]
      ->getName(), new FormattableMarkup('%entity_type: The deltas were updated in the items.', [
      '%entity_type' => $entity_type,
    ]));

    // Test get and set field values.
    $entity->name = 'foo';
    $this
      ->assertEquals([
      'value' => 'foo',
    ], $entity->name[0]
      ->toArray(), new FormattableMarkup('%entity_type: Field value has been retrieved via toArray()', [
      '%entity_type' => $entity_type,
    ]));
    $values = $entity
      ->toArray();
    $this
      ->assertEquals([
      0 => [
        'value' => 'foo',
      ],
    ], $values['name'], new FormattableMarkup('%entity_type: Field value has been retrieved via toArray() from an entity.', [
      '%entity_type' => $entity_type,
    ]));

    // Make sure the user id can be set to zero.
    $user_item[0]['target_id'] = 0;
    $entity = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->create([
      'name' => $name_item,
      'user_id' => $user_item,
      'field_test_text' => $text_item,
    ]);
    $this
      ->assertNotNull($entity->user_id->target_id, new FormattableMarkup('%entity_type: User id is not NULL', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertSame(0, $entity->user_id->target_id, new FormattableMarkup('%entity_type: User id has been set to 0', [
      '%entity_type' => $entity_type,
    ]));

    // Test setting the ID with the value only.
    $entity = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->create([
      'name' => $name_item,
      'user_id' => 0,
      'field_test_text' => $text_item,
    ]);
    $this
      ->assertNotNull($entity->user_id->target_id, new FormattableMarkup('%entity_type: User id is not NULL', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertSame(0, $entity->user_id->target_id, new FormattableMarkup('%entity_type: User id has been set to 0', [
      '%entity_type' => $entity_type,
    ]));
  }

  /**
   * Tries to save and load an entity again.
   */
  public function testSave() {

    // All entity variations have to have the same results.
    foreach (entity_test_entity_types() as $entity_type) {
      $this
        ->doTestSave($entity_type);
    }
  }

  /**
   * Executes the save tests for the given entity type.
   *
   * @param string $entity_type
   *   The entity type to run the tests with.
   */
  protected function doTestSave($entity_type) {
    $langcode_key = $this->entityTypeManager
      ->getDefinition($entity_type)
      ->getKey('langcode');
    $entity = $this
      ->createTestEntity($entity_type);
    $entity
      ->save();
    $this
      ->assertTrue((bool) $entity
      ->id(), new FormattableMarkup('%entity_type: Entity has received an id.', [
      '%entity_type' => $entity_type,
    ]));
    $entity = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->load($entity
      ->id());
    $this
      ->assertTrue((bool) $entity
      ->id(), new FormattableMarkup('%entity_type: Entity loaded.', [
      '%entity_type' => $entity_type,
    ]));

    // Access the name field.
    $this
      ->assertEquals(1, $entity->id->value, new FormattableMarkup('%entity_type: ID value can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertIsString($entity->uuid->value);
    $this
      ->assertEquals('en', $entity->{$langcode_key}->value, new FormattableMarkup('%entity_type: Language code can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals(\Drupal::languageManager()
      ->getLanguage('en'), $entity->{$langcode_key}->language, new FormattableMarkup('%entity_type: Language object can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityUser
      ->id(), $entity->user_id->target_id, new FormattableMarkup('%entity_type: User id can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityUser
      ->getAccountName(), $entity->user_id->entity->name->value, new FormattableMarkup('%entity_type: User name can be read.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals($this->entityFieldText, $entity->field_test_text->value, new FormattableMarkup('%entity_type: Text field can be read.', [
      '%entity_type' => $entity_type,
    ]));
  }

  /**
   * Tests introspection and getting metadata upfront.
   */
  public function testIntrospection() {

    // All entity variations have to have the same results.
    foreach (entity_test_entity_types() as $entity_type) {
      $this
        ->doTestIntrospection($entity_type);
    }
  }

  /**
   * Executes the introspection tests for the given entity type.
   *
   * @param string $entity_type
   *   The entity type to run the tests with.
   */
  protected function doTestIntrospection($entity_type) {

    // Test getting metadata upfront. The entity types used for this test have
    // a default bundle that is the same as the entity type.
    $definitions = \Drupal::service('entity_field.manager')
      ->getFieldDefinitions($entity_type, $entity_type);
    $this
      ->assertEquals('string', $definitions['name']
      ->getType(), $entity_type . ': Name field found.');
    $this
      ->assertEquals('entity_reference', $definitions['user_id']
      ->getType(), $entity_type . ': User field found.');
    $this
      ->assertEquals('text', $definitions['field_test_text']
      ->getType(), $entity_type . ': Test-text-field field found.');

    // Test deriving further metadata.
    $this
      ->assertInstanceOf(FieldDefinitionInterface::class, $definitions['name']);
    $field_item_definition = $definitions['name']
      ->getItemDefinition();
    $this
      ->assertInstanceOf(ComplexDataDefinitionInterface::class, $field_item_definition);
    $this
      ->assertEquals('field_item:string', $field_item_definition
      ->getDataType());
    $value_definition = $field_item_definition
      ->getPropertyDefinition('value');
    $this
      ->assertInstanceOf(DataDefinitionInterface::class, $value_definition);
    $this
      ->assertEquals('string', $value_definition
      ->getDataType());

    // Test deriving metadata from references.
    $entity_definition = EntityDataDefinition::create($entity_type);
    $langcode_key = $this->entityTypeManager
      ->getDefinition($entity_type)
      ->getKey('langcode');
    $reference_definition = $entity_definition
      ->getPropertyDefinition($langcode_key)
      ->getPropertyDefinition('language')
      ->getTargetDefinition();
    $this
      ->assertEquals('language', $reference_definition
      ->getDataType());
    $reference_definition = $entity_definition
      ->getPropertyDefinition('user_id')
      ->getPropertyDefinition('entity')
      ->getTargetDefinition();
    $this
      ->assertInstanceOf(EntityDataDefinitionInterface::class, $reference_definition);
    $this
      ->assertEquals('user', $reference_definition
      ->getEntityTypeId(), 'Referenced entity is of type "user".');

    // Test propagating down.
    $name_definition = $reference_definition
      ->getPropertyDefinition('name');
    $this
      ->assertInstanceOf(FieldDefinitionInterface::class, $name_definition);
    $this
      ->assertEquals('string', $name_definition
      ->getPropertyDefinition('value')
      ->getDataType());

    // Test introspecting an entity object.
    // @todo: Add bundles and test bundles as well.
    $entity = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->create();
    $definitions = $entity
      ->getFieldDefinitions();
    $this
      ->assertEquals('string', $definitions['name']
      ->getType(), $entity_type . ': Name field found.');
    $this
      ->assertEquals('entity_reference', $definitions['user_id']
      ->getType(), $entity_type . ': User field found.');
    $this
      ->assertEquals('text', $definitions['field_test_text']
      ->getType(), $entity_type . ': Test-text-field field found.');
    $name_properties = $entity->name
      ->getFieldDefinition()
      ->getPropertyDefinitions();
    $this
      ->assertEquals('string', $name_properties['value']
      ->getDataType(), $entity_type . ': String value property of the name found.');
    $userref_properties = $entity->user_id
      ->getFieldDefinition()
      ->getPropertyDefinitions();
    $this
      ->assertEquals('integer', $userref_properties['target_id']
      ->getDataType(), $entity_type . ': Entity id property of the user found.');
    $this
      ->assertEquals('entity_reference', $userref_properties['entity']
      ->getDataType(), $entity_type . ': Entity reference property of the user found.');
    $textfield_properties = $entity->field_test_text
      ->getFieldDefinition()
      ->getFieldStorageDefinition()
      ->getPropertyDefinitions();
    $this
      ->assertEquals('string', $textfield_properties['value']
      ->getDataType(), $entity_type . ': String value property of the test-text field found.');
    $this
      ->assertEquals('filter_format', $textfield_properties['format']
      ->getDataType(), $entity_type . ': String format field of the test-text field found.');
    $this
      ->assertEquals('string', $textfield_properties['processed']
      ->getDataType(), $entity_type . ': String processed property of the test-text field found.');

    // Make sure provided contextual information is right.
    $entity_adapter = $entity
      ->getTypedData();
    $this
      ->assertSame($entity_adapter
      ->getRoot(), $entity_adapter, 'Entity is root object.');
    $this
      ->assertEquals('', $entity_adapter
      ->getPropertyPath());
    $this
      ->assertEquals('', $entity_adapter
      ->getName());
    $this
      ->assertNull($entity_adapter
      ->getParent());
    $field = $entity->user_id;
    $this
      ->assertSame($field
      ->getRoot()
      ->getValue(), $entity, 'Entity is root object.');
    $this
      ->assertSame($field
      ->getEntity(), $entity, 'getEntity() returns the entity.');
    $this
      ->assertEquals('user_id', $field
      ->getPropertyPath());
    $this
      ->assertEquals('user_id', $field
      ->getName());
    $this
      ->assertSame($field
      ->getParent()
      ->getValue(), $entity, 'Parent object matches.');
    $field_item = $field[0];
    $this
      ->assertSame($field_item
      ->getRoot()
      ->getValue(), $entity, 'Entity is root object.');
    $this
      ->assertSame($field_item
      ->getEntity(), $entity, 'getEntity() returns the entity.');
    $this
      ->assertEquals('user_id.0', $field_item
      ->getPropertyPath());
    $this
      ->assertEquals('0', $field_item
      ->getName());
    $this
      ->assertSame($field_item
      ->getParent(), $field, 'Parent object matches.');
    $item_value = $field_item
      ->get('entity');
    $this
      ->assertSame($item_value
      ->getRoot()
      ->getValue(), $entity, 'Entity is root object.');
    $this
      ->assertEquals('user_id.0.entity', $item_value
      ->getPropertyPath());
    $this
      ->assertEquals('entity', $item_value
      ->getName());
    $this
      ->assertSame($item_value
      ->getParent(), $field_item, 'Parent object matches.');
  }

  /**
   * Tests iterating over properties.
   */
  public function testIterator() {

    // All entity variations have to have the same results.
    foreach (entity_test_entity_types() as $entity_type) {
      $this
        ->doTestIterator($entity_type);
    }
  }

  /**
   * Executes the iterator tests for the given entity type.
   *
   * @param string $entity_type
   *   The entity type to run the tests with.
   */
  protected function doTestIterator($entity_type) {
    $entity = $this
      ->createTestEntity($entity_type);
    foreach ($entity as $name => $field) {
      $this
        ->assertInstanceOf(FieldItemListInterface::class, $field);
      foreach ($field as $delta => $item) {
        $this
          ->assertInstanceOf(FieldItemInterface::class, $field[0]);
        foreach ($item as $value_name => $value_property) {
          $this
            ->assertInstanceOf(TypedDataInterface::class, $value_property);
          $value = $value_property
            ->getValue();
          $this
            ->assertTrue(!isset($value) || is_scalar($value) || $value instanceof EntityInterface, $entity_type . ": Value {$value_name} of item {$delta} of field {$name} is a primitive or an entity.");
        }
      }
    }
    $fields = $entity
      ->getFields();
    $this
      ->assertEquals(array_keys($entity
      ->getTypedData()
      ->getDataDefinition()
      ->getPropertyDefinitions()), array_keys($fields), new FormattableMarkup('%entity_type: All fields returned.', [
      '%entity_type' => $entity_type,
    ]));
    $this
      ->assertEquals(iterator_to_array($entity
      ->getIterator()), $fields, new FormattableMarkup('%entity_type: Entity iterator iterates over all fields.', [
      '%entity_type' => $entity_type,
    ]));
  }

  /**
   * Tests working with the entity based upon the TypedData API.
   */
  public function testDataStructureInterfaces() {

    // All entity variations have to have the same results.
    foreach (entity_test_entity_types() as $entity_type) {
      $this
        ->doTestDataStructureInterfaces($entity_type);
    }
  }

  /**
   * Executes the data structure interfaces tests for the given entity type.
   *
   * @param string $entity_type
   *   The entity type to run the tests with.
   */
  protected function doTestDataStructureInterfaces($entity_type) {
    $entity = $this
      ->createTestEntity($entity_type);

    // Test using the whole tree of typed data by navigating through the tree of
    // contained properties and getting all contained strings, limited by a
    // certain depth.
    $strings = [];
    $this
      ->getContainedStrings($entity
      ->getTypedData(), 0, $strings);

    // @todo: Once the user entity has defined properties this should contain
    // the user name and other user entity strings as well.
    $target_strings = [
      $entity->uuid->value,
      'en',
      $this->entityName,
      // Bundle name.
      $entity
        ->bundle(),
      $this->entityFieldText,
      // Field format.
      NULL,
    ];
    if ($entity instanceof RevisionLogInterface) {

      // Adding empty string for revision message.
      $target_strings[] = '';
    }
    asort($strings);
    asort($target_strings);
    $this
      ->assertEquals(array_values($target_strings), array_values($strings), new FormattableMarkup('%entity_type: All contained strings found.', [
      '%entity_type' => $entity_type,
    ]));
  }

  /**
   * Recursive helper for getting all contained strings,
   * i.e. properties of type string.
   */
  public function getContainedStrings(TypedDataInterface $wrapper, $depth, array &$strings) {
    if ($wrapper instanceof StringInterface) {
      $strings[] = $wrapper
        ->getValue();
    }

    // Recurse until a certain depth is reached if possible.
    if ($depth < 7) {
      if ($wrapper instanceof ListInterface) {
        foreach ($wrapper as $item) {
          $this
            ->getContainedStrings($item, $depth + 1, $strings);
        }
      }
      elseif ($wrapper instanceof ComplexDataInterface) {
        foreach ($wrapper as $property) {
          $this
            ->getContainedStrings($property, $depth + 1, $strings);
        }
      }
    }
  }

  /**
   * Makes sure data types are correctly derived for all entity types.
   */
  public function testDataTypes() {
    $types = \Drupal::typedDataManager()
      ->getDefinitions();
    foreach (entity_test_entity_types() as $entity_type) {
      $this
        ->assertNotEmpty($types['entity:' . $entity_type]['class'], 'Entity data type registered.');
    }

    // Check bundle types are provided as well.
    entity_test_create_bundle('bundle');
    $types = \Drupal::typedDataManager()
      ->getDefinitions();
    $this
      ->assertNotEmpty($types['entity:entity_test:bundle']['class'], 'Entity bundle data type registered.');
  }

  /**
   * Tests a base field override on a non-existing base field.
   *
   * @see entity_test_entity_base_field_info_alter()
   */
  public function testBaseFieldNonExistingBaseField() {
    $this->entityTypeManager
      ->getStorage('node_type')
      ->create([
      'type' => 'page',
      'name' => 'page',
    ])
      ->save();
    \Drupal::service('entity_field.manager')
      ->clearCachedFieldDefinitions();
    $fields = \Drupal::service('entity_field.manager')
      ->getFieldDefinitions('node', 'page');
    $override = $fields['status']
      ->getConfig('page');
    $override
      ->setLabel($this
      ->randomString())
      ->save();
    \Drupal::state()
      ->set('entity_test.node_remove_status_field', TRUE);
    \Drupal::service('entity_field.manager')
      ->clearCachedFieldDefinitions();
    $fields = \Drupal::service('entity_field.manager')
      ->getFieldDefinitions('node', 'page');

    // A base field override on a non-existing base field should not cause a
    // field definition to come into existence.
    $this
      ->assertFalse(isset($fields['status']), 'Node\'s status base field does not exist.');
  }

  /**
   * Tests creating a field override config for a bundle field.
   *
   * @see entity_test_entity_base_field_info_alter()
   */
  public function testFieldOverrideBundleField() {

    // First make sure the bundle field override in code, which is provided by
    // the test entity works.
    entity_test_create_bundle('some_test_bundle', 'Some test bundle', 'entity_test_field_override');
    $field_definitions = \Drupal::service('entity_field.manager')
      ->getFieldDefinitions('entity_test_field_override', 'entity_test_field_override');
    $this
      ->assertEquals('The default description.', $field_definitions['name']
      ->getDescription());
    $this
      ->assertNull($field_definitions['name']
      ->getTargetBundle());
    $field_definitions = \Drupal::service('entity_field.manager')
      ->getFieldDefinitions('entity_test_field_override', 'some_test_bundle');
    $this
      ->assertEquals('Custom description.', $field_definitions['name']
      ->getDescription());
    $this
      ->assertEquals('some_test_bundle', $field_definitions['name']
      ->getTargetBundle());

    // Now create a config override of the bundle field.
    $field_config = $field_definitions['name']
      ->getConfig('some_test_bundle');
    $field_config
      ->setTranslatable(FALSE);
    $field_config
      ->save();

    // Make sure both overrides are present.
    \Drupal::service('entity_field.manager')
      ->clearCachedFieldDefinitions();
    $field_definitions = \Drupal::service('entity_field.manager')
      ->getFieldDefinitions('entity_test_field_override', 'some_test_bundle');
    $this
      ->assertEquals('Custom description.', $field_definitions['name']
      ->getDescription());
    $this
      ->assertEquals('some_test_bundle', $field_definitions['name']
      ->getTargetBundle());
    $this
      ->assertFalse($field_definitions['name']
      ->isTranslatable());
  }

  /**
   * Tests validation constraints provided by the Entity API.
   */
  public function testEntityConstraintValidation() {
    $entity = $this
      ->createTestEntity('entity_test');
    $entity
      ->save();

    // Create a reference field item and let it reference the entity.
    $definition = BaseFieldDefinition::create('entity_reference')
      ->setLabel('Test entity')
      ->setSetting('target_type', 'entity_test');
    $reference_field = \Drupal::typedDataManager()
      ->create($definition);
    $reference = $reference_field
      ->appendItem([
      'entity' => $entity,
    ])
      ->get('entity');

    // Test validation the typed data object.
    $violations = $reference
      ->validate();
    $this
      ->assertEquals(0, $violations
      ->count());

    // Test validating an entity of the wrong type.
    $user = $this
      ->createUser();
    $user
      ->save();
    $node = $node = Node::create([
      'type' => 'page',
      'uid' => $user
        ->id(),
      'title' => $this
        ->randomString(),
    ]);
    $reference
      ->setValue($node);
    $violations = $reference
      ->validate();
    $this
      ->assertEquals(1, $violations
      ->count());

    // Test bundle validation.
    NodeType::create([
      'type' => 'article',
    ])
      ->save();
    $definition = BaseFieldDefinition::create('entity_reference')
      ->setLabel('Test entity')
      ->setSetting('target_type', 'node')
      ->setSetting('handler_settings', [
      'target_bundles' => [
        'article' => 'article',
      ],
    ]);
    $reference_field = \Drupal::TypedDataManager()
      ->create($definition);
    $reference_field
      ->appendItem([
      'entity' => $node,
    ]);
    $violations = $reference_field
      ->validate();
    $this
      ->assertEquals(1, $violations
      ->count());
    $node = Node::create([
      'type' => 'article',
      'uid' => $user
        ->id(),
      'title' => $this
        ->randomString(),
    ]);
    $node
      ->save();
    $reference_field->entity = $node;
    $violations = $reference_field
      ->validate();
    $this
      ->assertEquals(0, $violations
      ->count());
  }

  /**
   * Tests getting processed property values via a computed property.
   */
  public function testComputedProperties() {

    // All entity variations have to have the same results.
    foreach (entity_test_entity_types() as $entity_type) {
      $this
        ->doTestComputedProperties($entity_type);
    }
  }

  /**
   * Tests all the interaction points of a computed field.
   */
  public function testComputedFields() {
    $this
      ->installEntitySchema('entity_test_computed_field');
    \Drupal::state()
      ->set('entity_test_computed_field_item_list_value', [
      'foo computed',
    ]);

    // Check that the values are not computed unnecessarily during the lifecycle
    // of an entity when the field is not interacted with directly.
    \Drupal::state()
      ->set('computed_test_field_execution', 0);
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertSame(0, \Drupal::state()
      ->get('computed_test_field_execution', 0));
    $entity->name->value = $this
      ->randomString();
    $this
      ->assertSame(0, \Drupal::state()
      ->get('computed_test_field_execution', 0));
    $entity
      ->save();
    $this
      ->assertSame(0, \Drupal::state()
      ->get('computed_test_field_execution', 0));

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::getValue().
    \Drupal::state()
      ->set('computed_test_field_execution', 0);
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertSame([
      [
        'value' => 'foo computed',
      ],
    ], $entity->computed_string_field
      ->getValue());

    // Check that the values are only computed once.
    $this
      ->assertSame(1, \Drupal::state()
      ->get('computed_test_field_execution', 0));

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::setValue(). This also
    // checks that a subsequent getter does not try to re-compute the value.
    \Drupal::state()
      ->set('computed_test_field_execution', 0);
    $entity = EntityTestComputedField::create([]);
    $entity->computed_string_field
      ->setValue([
      [
        'value' => 'foo computed 1',
      ],
      [
        'value' => 'foo computed 2',
      ],
    ]);
    $this
      ->assertSame([
      [
        'value' => 'foo computed 1',
      ],
      [
        'value' => 'foo computed 2',
      ],
    ], $entity->computed_string_field
      ->getValue());

    // Check that the values have not been computed when they were explicitly
    // set.
    $this
      ->assertSame(0, \Drupal::state()
      ->get('computed_test_field_execution', 0));

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::getString().
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertSame('foo computed', $entity->computed_string_field
      ->getString());

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::get().
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertSame('foo computed', $entity->computed_string_field
      ->get(0)->value);
    $this
      ->assertEmpty($entity->computed_string_field
      ->get(1));

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::set().
    $entity = EntityTestComputedField::create([]);
    $entity->computed_string_field
      ->set(1, 'foo computed 1');
    $this
      ->assertSame('foo computed', $entity->computed_string_field[0]->value);
    $this
      ->assertSame('foo computed 1', $entity->computed_string_field[1]->value);
    $entity->computed_string_field
      ->set(0, 'foo computed 0');
    $this
      ->assertSame('foo computed 0', $entity->computed_string_field[0]->value);
    $this
      ->assertSame('foo computed 1', $entity->computed_string_field[1]->value);

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::appendItem().
    $entity = EntityTestComputedField::create([]);
    $entity->computed_string_field
      ->appendItem('foo computed 1');
    $this
      ->assertSame('foo computed', $entity->computed_string_field[0]->value);
    $this
      ->assertSame('foo computed 1', $entity->computed_string_field[1]->value);

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::removeItem().
    $entity = EntityTestComputedField::create([]);
    $entity->computed_string_field
      ->removeItem(0);
    $this
      ->assertTrue($entity->computed_string_field
      ->isEmpty());

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::isEmpty().
    \Drupal::state()
      ->set('entity_test_computed_field_item_list_value', []);
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertTrue($entity->computed_string_field
      ->isEmpty());
    \Drupal::state()
      ->set('entity_test_computed_field_item_list_value', [
      'foo computed',
    ]);
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertFalse($entity->computed_string_field
      ->isEmpty());

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::filter().
    $filter_callback = function ($item) {
      return !$item
        ->isEmpty();
    };
    $entity = EntityTestComputedField::create([]);
    $entity->computed_string_field
      ->filter($filter_callback);
    $this
      ->assertCount(1, $entity->computed_string_field);

    // Add an empty item to the list and check that it is filtered out.
    $entity->computed_string_field
      ->appendItem();
    $entity->computed_string_field
      ->filter($filter_callback);
    $this
      ->assertCount(1, $entity->computed_string_field);

    // Add a non-empty item to the list and check that it is not filtered out.
    $entity->computed_string_field
      ->appendItem('foo computed 1');
    $entity->computed_string_field
      ->filter($filter_callback);
    $this
      ->assertCount(2, $entity->computed_string_field);

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::offsetExists().
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertTrue($entity->computed_string_field
      ->offsetExists(0));
    $this
      ->assertFalse($entity->computed_string_field
      ->offsetExists(1));

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::getIterator().
    $entity = EntityTestComputedField::create([]);
    foreach ($entity->computed_string_field as $delta => $item) {
      $this
        ->assertSame('foo computed', $item->value);
    }

    // Test \Drupal\Core\TypedData\ComputedItemListTrait::count().
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertCount(1, $entity->computed_string_field);

    // Check that computed items are not auto-created when they have no values.
    \Drupal::state()
      ->set('entity_test_computed_field_item_list_value', []);
    $entity = EntityTestComputedField::create([]);
    $this
      ->assertCount(0, $entity->computed_string_field);

    // Test \Drupal\Core\Field\FieldItemList::equals() for a computed field.
    \Drupal::state()
      ->set('entity_test_computed_field_item_list_value', [
      'foo computed',
    ]);
    $entity = EntityTestComputedField::create([]);
    $computed_item_list1 = $entity->computed_string_field;
    $entity = EntityTestComputedField::create([]);
    $computed_item_list2 = $entity->computed_string_field;
    $this
      ->assertTrue($computed_item_list1
      ->equals($computed_item_list2));
    $computed_item_list2->value = 'foo computed 2';
    $this
      ->assertFalse($computed_item_list1
      ->equals($computed_item_list2));
  }

  /**
   * Tests an entity reference computed field.
   */
  public function testEntityReferenceComputedField() {
    $this
      ->installEntitySchema('entity_test_computed_field');

    // Create 2 entities to be referenced.
    $ref1 = EntityTest::create([
      'name' => 'foo',
      'type' => 'bar',
    ]);
    $ref1
      ->save();
    $ref2 = EntityTest::create([
      'name' => 'baz',
      'type' => 'bar',
    ]);
    $ref2
      ->save();
    \Drupal::state()
      ->set('entity_test_reference_computed_target_ids', [
      $ref1
        ->id(),
      $ref2
        ->id(),
    ]);
    $entity = EntityTestComputedField::create([]);
    $entity
      ->save();

    /** @var \Drupal\entity_test\Plugin\Field\ComputedReferenceTestFieldItemList $field */
    $field = $entity
      ->get('computed_reference_field');

    /** @var \Drupal\Core\Entity\EntityInterface[] $referenced_entities */
    $referenced_entities = $field
      ->referencedEntities();

    // Check that ::referencedEntities() is working with computed fields.
    $this
      ->assertEquals($ref1
      ->id(), $referenced_entities[0]
      ->id());
    $this
      ->assertEquals($ref2
      ->id(), $referenced_entities[1]
      ->id());
  }

  /**
   * Executes the computed properties tests for the given entity type.
   *
   * @param string $entity_type
   *   The entity type to run the tests with.
   */
  protected function doTestComputedProperties($entity_type) {
    $entity = $this
      ->createTestEntity($entity_type);
    $entity->field_test_text->value = "The <strong>text</strong> text to filter.";
    $entity->field_test_text->format = filter_default_format();
    $target = "<p>The &lt;strong&gt;text&lt;/strong&gt; text to filter.</p>\n";
    $this
      ->assertEquals($target, $entity->field_test_text->processed, new FormattableMarkup('%entity_type: Text is processed with the default filter.', [
      '%entity_type' => $entity_type,
    ]));

    // Save and load entity and make sure it still works.
    $entity
      ->save();
    $entity = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type)
      ->load($entity
      ->id());
    $this
      ->assertEquals($target, $entity->field_test_text->processed, new FormattableMarkup('%entity_type: Text is processed with the default filter.', [
      '%entity_type' => $entity_type,
    ]));
  }

  /**
   * Tests explicit entity ID assignment.
   */
  public function testEntityIdAssignment() {
    $entity_type = 'entity_test';

    /** @var \Drupal\Core\Entity\ContentEntityStorageInterface $storage */
    $storage = $this->container
      ->get('entity_type.manager')
      ->getStorage($entity_type);

    // Check that an ID can be explicitly assigned on creation.

    /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
    $entity = $this
      ->createTestEntity($entity_type);
    $entity_id = 3;
    $entity
      ->set('id', $entity_id);
    $this
      ->assertSame($entity_id, $entity
      ->id());
    $storage
      ->save($entity);
    $entity = $storage
      ->loadUnchanged($entity
      ->id());
    $this
      ->assertInstanceOf(ContentEntityInterface::class, $entity);

    // Check that an explicitly-assigned ID is preserved on update.
    $storage
      ->save($entity);
    $entity = $storage
      ->loadUnchanged($entity
      ->id());
    $this
      ->assertInstanceOf(ContentEntityInterface::class, $entity);

    // Check that an ID cannot be explicitly assigned on update.
    $this
      ->expectException(EntityStorageException::class);
    $entity
      ->set('id', $entity_id + 1);
    $storage
      ->save($entity);
  }

}