Add initial PresentationCounter logic

modules/opd_presentations/opd_presentations.info.yml

@@ -0,0 +1,5 @@
+name: Presentations
+description: Custom functionality for presentations.
+core_version_requirement: ^11
+type: module
+package: Custom

modules/opd_presentations/opd_presentations.services.yml

@@ -0,0 +1,2 @@
+services:
+  Drupal\opd_presentations\PresentationCounter: {}

modules/opd_presentations/src/PresentationCounter.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opd_presentations;
+
+final class PresentationCounter {
+
+  public function getCount(): int {
+    return 1;
+  }
+
+}

modules/opd_presentations/tests/src/Kernel/PresentationCounterTest.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opd_presentations\Kernel;
+
+use Drupal\KernelTests\Core\Entity\EntityKernelTestBase;
+use Drupal\Tests\node\Traits\NodeCreationTrait;
+use Drupal\node\NodeInterface;
+use Drupal\opd_presentations\PresentationCounter;
+use Drupal\paragraphs\Entity\Paragraph;
+use Drupal\paragraphs\ParagraphInterface;
+
+class PresentationCounterTest extends EntityKernelTestBase {
+
+  use NodeCreationTrait;
+
+  protected static $modules = [
+    'node',
+    'opd_presentations',
+    'paragraphs',
+  ];
+
+  public function test_count_presentation(): void {
+    $this->createPresentation(
+      events: [
+        Paragraph::create(['type' => 'event']),
+      ],
+    );
+
+    $counter = $this->container->get(PresentationCounter::class);
+
+    $this->assertSame(
+      actual: $counter->getCount(),
+      expected: 1,
+    );
+  }
+
+  /**
+   * @param ParagraphInterface[] $events
+   */
+  private function createPresentation(array $events): NodeInterface {
+    return $this->createNode([
+      'field_events' => $events,
+      'type' => 'presentation',
+    ]);
+  }
+
+}