LoadTest.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Magento\Customer\Controller\Section;

class LoadTest extends \Magento\TestFramework\TestCase\AbstractController
{
    public function testLoadInvalidSection()
    {
        $expected = [
            'message' => 'The &quot;section&lt;invalid&quot; section source isn&#039;t supported.',
        ];
        $this->dispatch(
            '/customer/section/load/?sections=section<invalid&force_new_section_timestamp=false&_=147066166394'
        );
        self::assertEquals(json_encode($expected), $this->getResponse()->getBody());
    }
}