Move all files to code/

code/web/modules/custom/my_module/my_module.info.yml

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+name: My Module
+type: module
+core: 8.x
+core_version_requirement: ^8 || ^9
+package: Custom

code/web/modules/custom/my_module/my_module.routing.yml

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+blog.page:
+  path: /blog
+  defaults:
+    _controller: Drupal\my_module\Controller\BlogPageController
+    _title: Blog
+  requirements:
+    _permission: access content

code/web/modules/custom/my_module/my_module.services.yml

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+services:
+  Drupal\my_module\Repository\ArticleRepository:
+    autowire: true

code/web/modules/custom/my_module/src/Controller/BlogPageController.php

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+<?php
+
+namespace Drupal\my_module\Controller;
+
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+class BlogPageController {
+
+  use StringTranslationTrait;
+
+  public function __invoke(): array {
+    return [
+      '#markup' => $this->t('Welcome to my blog!'),
+    ];
+  }
+
+}
+

code/web/modules/custom/my_module/src/Entity/Post.php

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+<?php
+
+namespace Drupal\my_module\Entity;
+
+use Drupal\node\NodeInterface;
+
+class Post {
+
+  private $node;
+
+  public function __construct(NodeInterface $node) {
+    if ($node->bundle() != 'article') {
+      throw new \InvalidArgumentException();
+    }
+
+    $this->node = $node;
+  }
+
+  public function getTitle(): string {
+    return $this->node->label();
+  }
+
+}

code/web/modules/custom/my_module/src/Repository/ArticleRepository.php

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+<?php
+
+namespace Drupal\my_module\Repository;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\my_module\Entity\Post;
+use Drupal\node\NodeInterface;
+
+class ArticleRepository {
+
+  private $nodeStorage;
+
+  public function __construct(EntityTypeManagerInterface $entityTypeManager) {
+    $this->nodeStorage = $entityTypeManager->getStorage('node');
+  }
+
+  public function getAll(): array {
+    $articles = $this->nodeStorage->loadByProperties([
+      'status' => NodeInterface::PUBLISHED,
+      'type' => 'article',
+    ]);
+
+    $this->sortByCreatedDate($articles);
+
+    return array_map(function (NodeInterface $node): Post {
+      return new Post($node);
+    }, $articles);
+  }
+
+  private function sortByCreatedDate(array &$articles): void {
+    uasort($articles, function (NodeInterface $a, NodeInterface $b): bool {
+      return $a->getCreatedTime() < $b->getCreatedTime();
+    });
+  }
+
+}

code/web/modules/custom/my_module/tests/src/Functional/BlogPageTest.php

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+<?php
+
+namespace Drupal\my_module\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Symfony\Component\HttpFoundation\Response;
+
+class BlogPageTest extends BrowserTestBase {
+
+  protected $defaultTheme = 'stark';
+
+  protected static $modules = [
+    'node',
+    'my_module',
+  ];
+
+  /** @test */
+  public function the_blog_page_loads_for_anonymous_users_and_contains_the_right_text() {
+    $this->drupalGet('blog');
+
+    $session = $this->assertSession();
+
+    $session->statusCodeEquals(Response::HTTP_OK);
+    $session->responseContains('<h1>Blog</h1>');
+    $session->pageTextContains('Welcome to my blog!');
+  }
+
+}

code/web/modules/custom/my_module/tests/src/Functional/MyModuleTest.php

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+<?php
+
+namespace Drupal\Tests\my_module\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Symfony\Component\HttpFoundation\Response;
+
+class MyModuleTest extends BrowserTestBase {
+
+  protected $defaultTheme = 'stark';
+
+  protected static $modules = ['my_module'];
+
+   /** @test */
+  public function the_front_page_loads_for_anonymous_users() {
+    $this->drupalGet('<front>');
+
+    $this->assertResponse(Response::HTTP_OK);
+  }
+
+  /** @test */
+  public function the_admin_page_is_not_accessible_to_anonymous_users() {
+    $this->drupalGet('admin');
+
+    $this->assertResponse(Response::HTTP_FORBIDDEN);
+  }
+
+  /** @test */
+  public function the_admin_page_is_accessible_by_admin_users() {
+    $adminUser = $this->createUser([
+      'access administration pages',
+    ]);
+
+    $this->drupalLogin($adminUser);
+
+    $this->drupalGet('admin');
+
+    $this->assertResponse(Response::HTTP_OK);
+  }
+
+}

code/web/modules/custom/my_module/tests/src/Kernel/ArticleRepositoryTest.php

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+<?php
+
+namespace Drupal\Tests\my_module\Kernel;
+
+use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\KernelTests\Core\Entity\EntityKernelTestBase;
+use Drupal\my_module\Entity\Post;
+use Drupal\my_module\Repository\ArticleRepository;
+use Drupal\node\NodeInterface;
+use Drupal\Tests\node\Traits\NodeCreationTrait;
+
+class ArticleRepositoryTest extends EntityKernelTestBase {
+
+  use NodeCreationTrait;
+
+  public static $modules = ['node', 'my_module'];
+
+  /** @test */
+  public function it_returns_blog_posts() {
+    $this->createNode(['type' => 'article', 'title' => 'Test post'])->save();
+
+    $repository = $this->container->get(ArticleRepository::class);
+    $articles = $repository->getAll();
+
+    $this->assertCount(1, $articles);
+    $this->assertIsObject($articles[1]);
+    $this->assertInstanceOf(Post::class, $articles[1]);
+    $this->assertSame('Test post', $articles[1]->getTitle());
+  }
+
+  /** @test */
+  public function nodes_that_are_not_articles_are_not_returned() {
+    $this->createNode(['type' => 'article'])->save();
+    $this->createNode(['type' => 'page'])->save();
+    $this->createNode(['type' => 'article'])->save();
+    $this->createNode(['type' => 'page'])->save();
+    $this->createNode(['type' => 'article'])->save();
+
+    $repository = $this->container->get(ArticleRepository::class);
+    $articles = $repository->getAll();
+
+    $this->assertCount(3, $articles);
+  }
+
+  /** @test */
+  public function only_published_articles_are_returned() {
+    $this->createNode(['type' => 'article', 'status' => NodeInterface::PUBLISHED])->save();
+    $this->createNode(['type' => 'article', 'status' => NodeInterface::NOT_PUBLISHED])->save();
+    $this->createNode(['type' => 'article', 'status' => NodeInterface::PUBLISHED])->save();
+    $this->createNode(['type' => 'article', 'status' => NodeInterface::NOT_PUBLISHED])->save();
+    $this->createNode(['type' => 'article', 'status' => NodeInterface::PUBLISHED])->save();
+
+    $repository = $this->container->get(ArticleRepository::class);
+    $articles = $repository->getAll();
+
+    $this->assertCount(3, $articles);
+  }
+
+  /** @test */
+  public function nodes_are_ordered_by_date_and_returned_newest_first() {
+    $this->createNode(['type' => 'article', 'created' => (new DrupalDateTime('-2 days'))->getTimestamp()]);
+    $this->createNode(['type' => 'article', 'created' => (new DrupalDateTime('-1 week'))->getTimestamp()]);
+    $this->createNode(['type' => 'article', 'created' => (new DrupalDateTime('-1 hour'))->getTimestamp()]);
+    $this->createNode(['type' => 'article', 'created' => (new DrupalDateTime('-1 year'))->getTimestamp()]);
+    $this->createNode(['type' => 'article', 'created' => (new DrupalDateTime('-1 month'))->getTimestamp()]);
+
+    $repository = $this->container->get(ArticleRepository::class);
+    $nodes = $repository->getAll();
+    $nodeIds = array_keys($nodes);
+
+    $this->assertSame([3, 1, 2, 5, 4], $nodeIds);
+  }
+
+  protected function setUp() {
+    parent::setUp();
+
+    $this->installConfig(['filter']);
+
+    $this->installSchema('node', ['node_access']);
+  }
+
+}

code/web/modules/custom/my_module/tests/src/Unit/Entity/PostTest.php

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+<?php
+
+namespace Drupal\Tests\my_module\Unit\Entity;
+
+use Drupal\my_module\Entity\Post;
+use Drupal\node\NodeInterface;
+use Drupal\Tests\UnitTestCase;
+
+class PostTest extends UnitTestCase {
+
+  /** @test */
+  public function it_returns_the_title() {
+    $node = $this->createMock(NodeInterface::class);
+
+    $node->expects($this->once())
+      ->method('label')
+      ->willReturn('Test post');
+    $node->method('bundle')->willReturn('article');
+
+    $post = new Post($node);
+
+    $this->assertSame('Test post', $post->getTitle());
+  }
+
+  /** @test */
+  public function it_throws_an_exception_if_the_node_is_not_an_article() {
+    $node = $this->createMock(NodeInterface::class);
+
+    $node->method('bundle')->willReturn('page');
+
+    $this->expectException(\InvalidArgumentException::class);
+
+    new Post($node);
+  }
+
+}

code/web/sites/default/settings.php

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+<?php
+
+// @codingStandardsIgnoreFile
+
+$settings['hash_salt'] = '53cr3t!';
+
+$settings["config_sync_directory"] = '../config';
+
+if (file_exists(__DIR__ . '/settings.local.php')) {
+  require_once __DIR__ . '/settings.local.php';
+}
+
+// Automatically generated include for settings managed by ddev.
+if (file_exists($app_root . '/' . $site_path . '/settings.ddev.php') && getenv('IS_DDEV_PROJECT') == 'true') {
+  include $app_root . '/' . $site_path . '/settings.ddev.php';
+}