Initial Drupal 11 with DDEV setup

web/core/profiles/tests/testing_hooks/src/Hook/TestingHooksProfile.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\testing_hooks\Hook;
+
+use Drupal\Core\Hook\Attribute\Hook;
+
+/**
+ * Hook implementation on behalf of another module.
+ */
+class TestingHooksProfile {
+
+  /**
+   * Implements hook_cache_flush().
+   */
+  #[Hook('cache_flush')]
+  public function flush(): void {
+    // Set a global value we can check in test code.
+    $GLOBALS['profile_oop'] = 'profile_oop';
+  }
+
+}

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

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+name: Testing Hooks in profile
+type: profile
+description: 'Minimal profile for running tests. Includes absolutely required modules only.'
+version: VERSION
+hidden: true
+install:
+  # Enable page_cache and dynamic_page_cache in testing, to ensure that as many
+  # tests as possible run with them enabled.
+  - drupal:page_cache
+  - dynamic_page_cache

web/core/profiles/tests/testing_hooks/testing_hooks.profile

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+<?php
+
+/**
+ * @file
+ * Implement hooks.
+ */
+
+declare(strict_types=1);
+
+/**
+ * This implements cache_flush.
+ *
+ * We do not have implements so this does not get converted.
+ */
+function testing_hooks_cache_flush(): void {
+  // Set a global value we can check in test code.
+  $GLOBALS['profile_procedural'] = 'profile_procedural';
+}