cakephp/tests/test_app/TestApp/Controller/Component/BlueberryComponent.php

<?php
declare(strict_types=1);

namespace TestApp\Controller\Component;

use Cake\Controller\Component;

class BlueberryComponent extends Component
{
    /**
     * testName property
     *
     * @var string|null
     */
    public $testName;

    /**
     * initialize method
     *
     * @param array $config
     * @return void
     */
    public function initialize(array $config): void
    {
        $this->testName = 'BlueberryComponent';
    }
}