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();

}