BasicAuthTestController.php

<?php

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

class BasicAuthTestController {
    
    /**
     * @see \Drupal\basic_auth\Tests\Authentication\BasicAuthTest::testControllerNotCalledBeforeAuth()
     */
    public function modifyState() {
        \Drupal::state()->set('basic_auth_test.state.controller_executed', TRUE);
        return [
            '#markup' => 'Done',
        ];
    }
    
    /**
     * @see \Drupal\basic_auth\Tests\Authentication\BasicAuthTest::testControllerNotCalledBeforeAuth()
     */
    public function readState() {
        // Mark this page as being uncacheable.
        \Drupal::service('page_cache_kill_switch')->trigger();
        return [
            '#markup' => \Drupal::state()->get('basic_auth_test.state.controller_executed') ? 'yep' : 'nope',
            '#cache' => [
                'max-age' => 0,
            ],
        ];
    }

}