TestControllers.php

<?php

declare (strict_types=1);
namespace Drupal\paramconverter_test;

use Drupal\Core\Entity\EntityInterface;
use Drupal\node\NodeInterface;

/**
 * Controller routine for testing the paramconverter.
 */
class TestControllers {
  public function testUserNodeFoo(EntityInterface $user, NodeInterface $node, $foo) {
    $foo = is_object($foo) ? $foo->label() : $foo;
    return [
      '#markup' => "user: {$user->label()}, node: {$node->label()}, foo: {$foo}",
    ];
  }
  public function testNodeSetParent(NodeInterface $node, NodeInterface $parent) {
    return [
      '#markup' => "Setting '{$parent->label()}' as parent of '{$node->label()}'.",
    ];
  }
  public function testEntityLanguage(NodeInterface $node) {
    $build = [
      '#markup' => $node->label(),
    ];
    \Drupal::service('renderer')->addCacheableDependency($build, $node);
    return $build;
  }

}