Test the talk count

web/modules/custom/opdavies_talks/src/Controller/TalksPageController.php

@@ -4,10 +4,16 @@ declare(strict_types=1);
 
 namespace Drupal\opdavies_talks\Controller;
 
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
 final class TalksPageController {
 
+  use StringTranslationTrait;
+
   public function __invoke(): array {
-    return [];
+    $talkCount = 2;
+
+    return ['#markup' => $this->t('<span data-talk-count>:count talks</span>', [':count' => $talkCount])];
   }
 
 }

web/modules/custom/opdavies_talks/tests/src/Functional/TalksPageTest.php

@@ -18,4 +18,11 @@ class TalksPageTest extends BrowserTestBase {
     $session->statusCodeEquals(Response::HTTP_OK);
   }
 
+  public function test_it_displays_the_talk_count(): void {
+    $this->drupalGet('/talks');
+
+    $session = $this->assertSession();
+    $session->responseContains('<span data-talk-count>2 talks</span>');
+  }
+
 }