CakeCarts/tests/TestCase/Controller/CartsControllerTest.php

<?php
declare(strict_types=1);

namespace CakeCarts\Test\TestCase\Controller;

use Cake\TestSuite\IntegrationTestTrait;
use Cake\TestSuite\TestCase;
use CakeCarts\Controller\CartsController;

/**
 * CakeCarts\Controller\CartsController Test Case
 *
 * @uses \CakeCarts\Controller\CartsController
 */
class CartsControllerTest extends TestCase
{
    use IntegrationTestTrait;

    /**
     * Test subject
     *
     * @var \CakeCarts\Model\Table\CartItemsTable
     */
    protected $Carts;

    public function setUp(): void
    {
        parent::setUp(); // TODO: Change the autogenerated stub

        $config = $this->getTableLocator()->exists('Carts') ? [] : ['className' => CartsTable::class];
        $this->Carts = $this->getTableLocator()->get('Carts', $config);
    }

    public function testIndex(): void
    {
        $url = [
            'plugin' => 'CakeCarts',
            'controller' => 'Carts',
            'action' => 'index',
        ];
        $this->get($url);

        $this->assertResponseCode(200);
    }
}