ArgumentDefaultTest.php

<?php

namespace Drupal\views_test_data\Plugin\views\argument_default;

use Drupal\views\Plugin\views\argument_default\ArgumentDefaultPluginBase;

/**
 * Defines an argument default test plugin.
 *
 * @ViewsArgumentDefault(
 *   id = "argument_default_test",
 *   title = @Translation("Argument default test")
 * )
 */
class ArgumentDefaultTest extends ArgumentDefaultPluginBase {
    
    /**
     * {@inheritdoc}
     */
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['value'] = [
            'default' => '',
        ];
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getArgument() {
        $this->view->element['#cache']['tags'][] = 'example_tag';
        return $this->options['value'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function calculateDependencies() {
        return [
            'content' => [
                'ArgumentDefaultTest',
            ],
        ];
    }

}