More test coverage.

src/Notification/Notification.php

@@ -9,7 +9,7 @@ class Notification
     /**
      * @var NotificationInterface[] $notifiers
      */
-    public array $notifiers = array();
+    private array $notifiers = array();
 
     /**
      * Load multiple configurations
@@ -28,7 +28,7 @@ class Notification
      *
      * @param string $key      Notification class
      * @param string[] $config Implementation specific configuration
-     *  @SuppressWarnings(PHPMD)
+     * @SuppressWarnings(PHPMD)
      */
     public function loadSingle(string $key, array $config): void
     {
@@ -36,16 +36,31 @@ class Notification
             case 'ntfy':
             case 'Ntfy':
             case 'NTFY':
-                $this->notifiers[] = Ntfy::factory($config);
+                $this->addNotifier(Ntfy::factory($config));
                 break;
             default:
                 break;
         }
     }
 
+    public function addNotifier(NotificationInterface $instance): void
+    {
+        $this->notifiers[] = $instance;
+    }
+
+    /**
+     * Get all active notifiers.
+     *
+     * @return NotificationInterface[] All notifiers.
+     */
+    public function getNotifiers(): array
+    {
+        return $this->notifiers;
+    }
+
     public function send(string $title, string $message): void
     {
-        foreach ($this->notifiers as $notifier) {
+        foreach ($this->getNotifiers() as $notifier) {
             $notifier->send($title, $message);
         }
     }