Issue #3307383 by slucero, staceroni: Block Form Fails on Content Type Layout Builder Page

        'children' => [],

      ];

      foreach ($tokens as $name => $info) {

        $description = $info['description'] ?? '';

        try {

          $example = $this->token->replace("[$type:$name]", $this->getContextValues());

        $item['children'][$name] = "[$type:$name]" . ' - ' . $info['name'] . ': '

          . $description

          . " \"" . Xss::filter(substr($example, 0, 255)) . "\"";

        }

        catch (\Exception $ignored) {

          // Ignore this exception and skip displaying an example for this

          // token.

          $example = '';

        }

        $label = sprintf('[%s:%s] - %s: %s', $type, $name, $info['name'], $info['description'] ?? '');

        if ($example !== '') {

          $label .= ' "' . Xss::filter(substr($example, 0, 255)) . '"';

        }

        $item['children'][$name] = $label;

      }

      $token_items[$type] = $item;

<?php

namespace Drupal\Tests\patternkit\Functional;

/**

 * End-to-end testing for placing and using a pattern block in default layouts.

 *

 * @group patternkit

 */

class DefaultLayoutTest extends PatternkitBrowserTestBase {

  /**

   * {@inheritdoc}

   */

  static protected $modules = [

    'patternkit_example',

  ];

  /**

   * Verify successful creation and loading of a default layout.

   */

  public function testDefaultLayoutCreation() {

    $assert = $this->assertSession();

    $page = $this->getSession()->getPage();

    $account = $this->drupalCreateUser([

      'access administration pages',

      'administer node display',

      'configure any layout',

      'bypass node access',

    ]);

    $this->drupalLogin($account);

    // Set the default the Node layout and place a patternkit block.

    $this->drupalGet('admin/structure/types/manage/bundle_with_layout_enabled/display');

    // Click the "Manage layout" button.

    $page->find('css', '#edit-manage-layout')->press();

    $page->clickLink('Add block');

    $assert->linkExists('[Patternkit] Example');

    $page->clickLink('[Patternkit] Example');

    // Fill in the hidden fields manually since fillField() won't find hidden

    // fields.

    $page->find('css', '#schema_instance_config')

      ->setValue(json_encode([

        'text' => '[node:title]',

        'formatted_text' => 'Pattern block body',

        'image_url' => '',

        'hidden' => 'Hidden text',

      ]));

    // Set the node for context to fill in the token.

    $page->selectFieldOption('settings[context_mapping][node]', 'layout_builder.entity');

    $page->pressButton('Add block');

    $page->pressButton('Save layout');

    // Confirm visibility on a Node page.

    $this->drupalGet('node/1');

    $assert->pageTextContains('Test node title');

    $assert->pageTextContains('Pattern block body');

    $assert->pageTextNotContains('[node:title]');

  }

}