class ForumManagerTest

class ForumManagerTest extends UnitTestCase {
  
  /**
   * Tests ForumManager::getIndex().
   */
  public function testGetIndex() {
    $entity_field_manager = $this->createMock(EntityFieldManagerInterface::class);
    $entity_type_manager = $this->createMock(EntityTypeManagerInterface::class);
    $storage = $this->getMockBuilder('\\Drupal\\taxonomy\\VocabularyStorage')
      ->disableOriginalConstructor()
      ->getMock();
    $config_factory = $this->createMock('\\Drupal\\Core\\Config\\ConfigFactoryInterface');
    $config = $this->getMockBuilder('\\Drupal\\Core\\Config\\Config')
      ->disableOriginalConstructor()
      ->getMock();
    $config_factory->expects($this->once())
      ->method('get')
      ->will($this->returnValue($config));
    $config->expects($this->once())
      ->method('get')
      ->will($this->returnValue('forums'));
    $entity_type_manager->expects($this->once())
      ->method('getStorage')
      ->will($this->returnValue($storage));
    // This is sufficient for testing purposes.
    $term = new \stdClass();
    $storage->expects($this->once())
      ->method('create')
      ->will($this->returnValue($term));
    $connection = $this->getMockBuilder('\\Drupal\\Core\\Database\\Connection')
      ->disableOriginalConstructor()
      ->getMock();
    $translation_manager = $this->getMockBuilder('\\Drupal\\Core\\StringTranslation\\TranslationManager')
      ->disableOriginalConstructor()
      ->getMock();
    $comment_manager = $this->getMockBuilder('\\Drupal\\comment\\CommentManagerInterface')
      ->disableOriginalConstructor()
      ->getMock();
    $manager = $this->getMockBuilder('\\Drupal\\forum\\ForumManager')
      ->setMethods([
      'getChildren',
    ])
      ->setConstructorArgs([
      $config_factory,
      $entity_type_manager,
      $connection,
      $translation_manager,
      $comment_manager,
      $entity_field_manager,
    ])
      ->getMock();
    $manager->expects($this->once())
      ->method('getChildren')
      ->will($this->returnValue([]));
    // Get the index once.
    $index1 = $manager->getIndex();
    // Get it again. This should not return the previously generated index. If
    // it does not, then the test will fail as the mocked methods will be called
    // more than once.
    $index2 = $manager->getIndex();
    $this->assertEquals($index1, $index2);
  }

}