Add lesson 3

- Add failing blog page test.
- Add custom routing, need to create Controller.
- Add BlogPageController.
- Test posts are visible.

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

@@ -0,0 +1,33 @@
+<?php
+
+namespace Drupal\Tests\example\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Symfony\Component\HttpFoundation\Response;
+
+class BlogPageTest extends BrowserTestBase {
+
+  protected $defaultTheme = 'stark';
+
+  protected static $modules = ['node', 'example'];
+
+  public function testBlogPage(): void {
+    $this->drupalGet('/blog');
+
+    $this->assertSession()->statusCodeEquals(Response::HTTP_OK);
+  }
+
+  public function testPostsAreVisible(): void {
+    $this->createNode(['type' => 'post', 'title' => 'First post']);
+    $this->createNode(['type' => 'post', 'title' => 'Second post']);
+    $this->createNode(['type' => 'post', 'title' => 'Third post']);
+
+    $this->drupalGet('/blog');
+
+    $assert = $this->assertSession();
+    $assert->pageTextContains('First post');
+    $assert->pageTextContains('Second post');
+    $assert->pageTextContains('Third post');
+  }
+
+}