class NodeTestBase

abstract class NodeTestBase extends WebTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'node',
        'datetime',
    ];
    
    /**
     * The node access control handler.
     *
     * @var \Drupal\Core\Entity\EntityAccessControlHandlerInterface
     */
    protected $accessHandler;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // Create Basic page and Article node types.
        if ($this->profile != 'standard') {
            $this->drupalCreateContentType([
                'type' => 'page',
                'name' => 'Basic page',
                'display_submitted' => FALSE,
            ]);
            $this->drupalCreateContentType([
                'type' => 'article',
                'name' => 'Article',
            ]);
        }
        $this->accessHandler = \Drupal::entityTypeManager()->getAccessControlHandler('node');
    }
    
    /**
     * Asserts that node access correctly grants or denies access.
     *
     * @param array $ops
     *   An associative array of the expected node access grants for the node
     *   and account, with each key as the name of an operation (e.g. 'view',
     *   'delete') and each value a Boolean indicating whether access to that
     *   operation should be granted.
     * @param \Drupal\node\NodeInterface $node
     *   The node object to check.
     * @param \Drupal\Core\Session\AccountInterface $account
     *   The user account for which to check access.
     */
    public function assertNodeAccess(array $ops, NodeInterface $node, AccountInterface $account) {
        foreach ($ops as $op => $result) {
            $this->assertEqual($result, $this->accessHandler
                ->access($node, $op, $account), $this->nodeAccessAssertMessage($op, $result, $node->language()
                ->getId()));
        }
    }
    
    /**
     * Asserts that node create access correctly grants or denies access.
     *
     * @param string $bundle
     *   The node bundle to check access to.
     * @param bool $result
     *   Whether access should be granted or not.
     * @param \Drupal\Core\Session\AccountInterface $account
     *   The user account for which to check access.
     * @param string|null $langcode
     *   (optional) The language code indicating which translation of the node
     *   to check. If NULL, the untranslated (fallback) access is checked.
     */
    public function assertNodeCreateAccess($bundle, $result, AccountInterface $account, $langcode = NULL) {
        $this->assertEqual($result, $this->accessHandler
            ->createAccess($bundle, $account, [
            'langcode' => $langcode,
        ]), $this->nodeAccessAssertMessage('create', $result, $langcode));
    }
    
    /**
     * Constructs an assert message to display which node access was tested.
     *
     * @param string $operation
     *   The operation to check access for.
     * @param bool $result
     *   Whether access should be granted or not.
     * @param string|null $langcode
     *   (optional) The language code indicating which translation of the node
     *   to check. If NULL, the untranslated (fallback) access is checked.
     *
     * @return string
     *   An assert message string which contains information in plain English
     *   about the node access permission test that was performed.
     */
    public function nodeAccessAssertMessage($operation, $result, $langcode = NULL) {
        return new FormattableMarkup('Node access returns @result with operation %op, language code %langcode.', [
            '@result' => $result ? 'true' : 'false',
            '%op' => $operation,
            '%langcode' => !empty($langcode) ? $langcode : 'empty',
        ]);
    }

}