TabbingManagerTestController.php

<?php

namespace Drupal\tabbingmanager_test\Controller;

use Drupal\Core\Controller\ControllerBase;

/**
 * For testing the Tabbing Manager.
 */
class TabbingManagerTestController extends ControllerBase {
    
    /**
     * Provides a page with the tabbingManager library for testing tabbing manager.
     *
     * @return array
     *   The render array.
     */
    public function build() {
        return [
            'container' => [
                '#type' => 'container',
                '#attributes' => [
                    'id' => 'tabbingmanager-test-container',
                ],
                'first' => [
                    '#type' => 'textfield',
                    '#title' => $this->t('First'),
                    '#attributes' => [
                        'id' => 'first',
                    ],
                ],
                'second' => [
                    '#type' => 'textfield',
                    '#title' => $this->t('Second'),
                    '#attributes' => [
                        'id' => 'second',
                    ],
                ],
                'third' => [
                    '#type' => 'textfield',
                    '#title' => $this->t('Third'),
                    '#attributes' => [
                        'id' => 'third',
                    ],
                ],
            ],
            'another_container' => [
                '#type' => 'container',
                '#attributes' => [
                    'id' => 'tabbingmanager-test-another-container',
                ],
                'fourth' => [
                    '#type' => 'textfield',
                    '#title' => $this->t('Fourth'),
                    '#attributes' => [
                        'id' => 'fourth',
                    ],
                ],
                'fifth' => [
                    '#type' => 'textfield',
                    '#title' => $this->t('Fifth'),
                    '#attributes' => [
                        'id' => 'fifth',
                    ],
                ],
                'sixth' => [
                    '#type' => 'textfield',
                    '#title' => $this->t('Sixth'),
                    '#attributes' => [
                        'id' => 'sixth',
                    ],
                ],
            ],
            '#attached' => [
                'library' => [
                    'core/drupal.tabbingmanager',
                ],
            ],
        ];
    }

}