class BookManagerTest

class BookManagerTest extends UnitTestCase {

  /**
   * The mocked entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManager|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $entityTypeManager;

  /**
   * The mocked language manager.
   *
   * @var \Drupal\Core\Language\LanguageManager|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $languageManager;

  /**
   * The mocked entity repository.
   *
   * @var \Drupal\Core\Entity\EntityRepositoryInterface|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $entityRepository;

  /**
   * The mocked config factory.
   *
   * @var \Drupal\Core\Config\ConfigFactory|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $configFactory;

  /**
   * The mocked translation manager.
   *
   * @var \Drupal\Core\StringTranslation\TranslationInterface|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $translation;

  /**
   * The mocked renderer.
   *
   * @var \Drupal\Core\Render\RendererInterface|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $renderer;

  /**
   * The tested book manager.
   *
   * @var \Drupal\book\BookManager
   */
  protected $bookManager;

  /**
   * Book outline storage.
   *
   * @var \Drupal\book\BookOutlineStorageInterface
   */
  protected $bookOutlineStorage;

  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->entityTypeManager = $this
      ->createMock(EntityTypeManagerInterface::class);
    $this->translation = $this
      ->getStringTranslationStub();
    $this->configFactory = $this
      ->getConfigFactoryStub([]);
    $this->bookOutlineStorage = $this
      ->createMock('Drupal\\book\\BookOutlineStorageInterface');
    $this->renderer = $this
      ->createMock('\\Drupal\\Core\\Render\\RendererInterface');
    $this->languageManager = $this
      ->createMock('Drupal\\Core\\Language\\LanguageManagerInterface');
    $this->entityRepository = $this
      ->createMock('Drupal\\Core\\Entity\\EntityRepositoryInterface');

    // Used for both book manager cache services: backend chain and memory.
    $cache = $this
      ->createMock(CacheBackendInterface::class);
    $this->bookManager = new BookManager($this->entityTypeManager, $this->translation, $this->configFactory, $this->bookOutlineStorage, $this->renderer, $this->languageManager, $this->entityRepository, $cache, $cache);
  }

  /**
   * Tests the getBookParents() method.
   *
   * @dataProvider providerTestGetBookParents
   */
  public function testGetBookParents($book, $parent, $expected) {
    $this
      ->assertEquals($expected, $this->bookManager
      ->getBookParents($book, $parent));
  }

  /**
   * Provides test data for testGetBookParents.
   *
   * @return array
   *   The test data.
   */
  public static function providerTestGetBookParents() {
    $empty = [
      'p1' => 0,
      'p2' => 0,
      'p3' => 0,
      'p4' => 0,
      'p5' => 0,
      'p6' => 0,
      'p7' => 0,
      'p8' => 0,
      'p9' => 0,
    ];
    return [
      // Provides a book without an existing parent.
      [
        [
          'pid' => 0,
          'nid' => 12,
        ],
        [],
        [
          'depth' => 1,
          'p1' => 12,
        ] + $empty,
      ],
      // Provides a book with an existing parent.
      [
        [
          'pid' => 11,
          'nid' => 12,
        ],
        [
          'nid' => 11,
          'depth' => 1,
          'p1' => 11,
        ],
        [
          'depth' => 2,
          'p1' => 11,
          'p2' => 12,
        ] + $empty,
      ],
      // Provides a book with two existing parents.
      [
        [
          'pid' => 11,
          'nid' => 12,
        ],
        [
          'nid' => 11,
          'depth' => 2,
          'p1' => 10,
          'p2' => 11,
        ],
        [
          'depth' => 3,
          'p1' => 10,
          'p2' => 11,
          'p3' => 12,
        ] + $empty,
      ],
    ];
  }

}