Initial Drupal 11 with DDEV setup

web/core/profiles/tests/testing_requirements/src/Install/Requirements/TestingRequirementsRequirements.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\testing_requirements\Install\Requirements;
+
+use Drupal\Core\Extension\InstallRequirementsInterface;
+use Drupal\Core\Extension\Requirement\RequirementSeverity;
+
+/**
+ * Install time requirements for the testing_requirements module.
+ */
+class TestingRequirementsRequirements implements InstallRequirementsInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getRequirements(): array {
+    $requirements = [];
+    $requirements['testing_requirements'] = [
+      'title' => t('Testing requirements'),
+      'severity' => RequirementSeverity::Error,
+      'description' => t('Testing requirements failed requirements.'),
+    ];
+
+    return $requirements;
+  }
+
+}

web/core/profiles/tests/testing_requirements/testing_requirements.info.yml

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+name: 'Testing requirements'
+type: profile
+description: 'Profile for testing hook_requirements().'
+version: VERSION
+hidden: true