Issue #3456912 by hoffismo: Add test to ensure module functionality is maintained

tests/src/Functional/TomeAddPathsTest.php

+<?php
+
+namespace Drupal\Tests\tome_add_paths\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Drupal\tome_static\Event\CollectPathsEvent;
+use Drupal\tome_static\Event\TomeStaticEvents;
+
+/**
+ * Tests the functionality of Tome Add Paths.
+ *
+ * @coversDefaultClass \Drupal\tome_add_paths\EventSubscriber\AddPathsEventSubscriber
+ * @group tome_add_paths
+ */
+class TomeAddPathsTest extends BrowserTestBase {
+
+  /**
+   * The configuration factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * The event dispatcher.
+   *
+   * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
+   */
+  protected $eventDispatcher;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  protected static $modules = [
+    'node',
+    'tome_add_paths',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+    $this->configFactory = \Drupal::service('config.factory');
+    $this->eventDispatcher = \Drupal::service('event_dispatcher');
+
+    $this->drupalLogin($this->createUser(['use tome static']));
+    $this->drupalCreateContentType(['type' => 'article']);
+    $this->drupalCreateNode(['type' => 'article', 'title' => 'My First Article', 'path' => '/my-first-path']);
+    $this->drupalCreateNode(['type' => 'article', 'title' => 'My Second Article', 'path' => '/my-second-path']);
+
+    $this->drupalGet('/admin/config/tome/config');
+    $this->SubmitForm([
+      'paths' => '/my-first-path\r\n/my-second-path',
+    ], 'Save configuration');
+  }
+
+  /**
+   * Tests the Tome Add Paths admin form.
+   */
+  public function testAddPathsForm() {
+    $config = $this->configFactory->get('tome_add_paths.config')->get('paths');
+    $paths = explode('\r\n', str_replace("\r\n", '\r\n', $config));
+    $this->assertSame($paths, ['/my-first-path', '/my-second-path']);
+  }
+
+  /**
+   * @covers \Drupal\tome_add_paths\EventSubscriber\AddPathsEventSubscriber::addPaths
+   */
+  public function testAddPaths() {
+    $this->eventDispatcher->addListener(TomeStaticEvents::COLLECT_PATHS, [$this, 'addPaths']);
+    $event = new CollectPathsEvent([]);
+    $this->eventDispatcher->dispatch($event, TomeStaticEvents::COLLECT_PATHS);
+    $paths = $event->getPaths();
+    $this->assertContains('/my-first-path', $paths);
+    $this->assertContains('/my-second-path', $paths);
+  }
+
+  /**
+   * Emulates the addPaths() listener.
+   *
+   * @param \Drupal\tome_static\Event\CollectPathsEvent $event
+   *   The collect paths event.
+   */
+  public function addPaths(CollectPathsEvent $event) {
+    $config = $this->configFactory->get('tome_add_paths.config')->get('paths');
+    $paths = explode('\r\n', str_replace("\r\n", '\r\n', $config));
+    $event->addPaths($paths);
+  }
+
+}