Issue #3513879 by nicxvan: Convert experimental_module_requirements_test_requirements to new Class

<?php

/**

 * @file

 * Experimental Test Requirements module to test hook_requirements().

 */

declare(strict_types=1);

use Drupal\Core\Extension\Requirement\RequirementSeverity;

/**

 * Implements hook_requirements().

 */

function experimental_module_requirements_test_requirements(): array {

  $requirements = [];

  if (\Drupal::state()->get('experimental_module_requirements_test_requirements', FALSE)) {

    $requirements['experimental_module_requirements_test_requirements'] = [

      'severity' => RequirementSeverity::Error,

      'description' => t('The Experimental Test Requirements module can not be installed.'),

    ];

  }

  return $requirements;

}

<?php

declare(strict_types=1);

namespace Drupal\experimental_module_requirements_test\Install\Requirements;

use Drupal\Core\Extension\InstallRequirementsInterface;

use Drupal\Core\Extension\Requirement\RequirementSeverity;

/**

 * Install time requirements for the Experimental Requirements Test module.

 */

class ExperimentalModuleRequirementsTestRequirements implements InstallRequirementsInterface {

  /**

   * {@inheritdoc}

   */

  public static function getRequirements(): array {

    $requirements = [];

    if (\Drupal::state()->get('experimental_module_requirements_test_requirements', FALSE)) {

      $requirements['experimental_module_requirements_test_requirements'] = [

        'severity' => RequirementSeverity::Error,

        'description' => t('The Experimental Test Requirements module can not be installed.'),

      ];

    }

    return $requirements;

  }

}