class BaseFieldDefinitionTestBase

abstract class BaseFieldDefinitionTestBase extends UnitTestCase {
  
  /**
   * The field definition used in this test.
   *
   * @var \Drupal\Core\Field\BaseFieldDefinition
   */
  protected $definition;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    // getModuleAndPath() returns an array of the module name and directory.
    [
      $module_name,
      $module_dir,
    ] = $this->getModuleAndPath();
    $namespaces = new \ArrayObject();
    $namespaces["Drupal\\{$module_name}"] = $module_dir . '/src';
    $module_handler = $this->createMock('Drupal\\Core\\Extension\\ModuleHandlerInterface');
    $module_handler->expects($this->once())
      ->method('moduleExists')
      ->with($module_name)
      ->willReturn(TRUE);
    $typed_data_manager = $this->createMock(TypedDataManagerInterface::class);
    $plugin_manager = new FieldTypePluginManager($namespaces, $this->createMock('Drupal\\Core\\Cache\\CacheBackendInterface'), $module_handler, $typed_data_manager);
    $container = new ContainerBuilder();
    $container->set('plugin.manager.field.field_type', $plugin_manager);
    // The 'string_translation' service is used by the @Translation annotation.
    $container->set('string_translation', $this->getStringTranslationStub());
    \Drupal::setContainer($container);
    $this->definition = BaseFieldDefinition::create($this->getPluginId());
  }
  
  /**
   * Returns the plugin ID of the tested field type.
   *
   * @return string
   *   The plugin ID.
   */
  protected abstract function getPluginId();
  
  /**
   * Returns the module name and the module directory for the plugin.
   *
   * @return array
   *   A one-dimensional array containing the following strings:
   *   - The module name.
   *   - The module directory, e.g. DRUPAL_CORE . 'core/modules/path'.
   */
  protected abstract function getModuleAndPath();

}