feat(blog): add the initial blog page

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

@@ -0,0 +1,3 @@
+name: My Module
+type: module
+core_version_requirement: ^10

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

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

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\my_module\Controller;
+
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+final class BlogPageController {
+
+  use StringTranslationTrait;
+
+  /**
+   * @return array<string, mixed>
+   */
+  public function __invoke(): array {
+    return [
+      '#markup' => $this->t('Welcome to my blog!'),
+    ];
+  }
+
+}

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

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\my_module\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Symfony\Component\HttpFoundation\Response;
+
+final class BlogPageTest extends BrowserTestBase {
+
+  public $defaultTheme = 'stark';
+
+  protected static $modules = [
+    // Core.
+    'node',
+
+    // Custom.
+    'my_module',
+  ];
+
+  /** @test */
+  public function the_blog_page_loads_for_anonymous_users_and_contains_the_right_text(): void {
+    $this->drupalGet('/blog');
+
+    $assert = $this->assertSession();
+
+    $assert->statusCodeEquals(Response::HTTP_OK);
+    $assert->responseContains('<h1>Blog</h1>');
+    $assert->pageTextContains('Welcome to my blog!');
+  }
+
+}