update tests

app/Models/Notification.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use App\Models\BaseModel;
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
 class Notification extends BaseModel
@@ -28,12 +29,40 @@ class Notification extends BaseModel
     ];
 
     protected $casts = [
-        'scheduled_at'      => 'datetime',
-        'expires_at'        => 'datetime',
-        // If delivery_channels is JSON in DB:
-        'delivery_channels' => 'array',
+        'scheduled_at' => 'datetime',
+        'expires_at' => 'datetime',
     ];
 
+    /**
+     * MySQL stores channels as SET('in_app','email','sms'); expose as array in PHP.
+     */
+    protected function deliveryChannels(): Attribute
+    {
+        return Attribute::make(
+            get: static function (?string $value): array {
+                if ($value === null || $value === '') {
+                    return [];
+                }
+
+                $trimmed = trim($value);
+                if (str_starts_with($trimmed, '[')) {
+                    $decoded = json_decode($trimmed, true);
+
+                    return is_array($decoded) ? array_values($decoded) : [];
+                }
+
+                return array_values(array_filter(array_map('trim', explode(',', $value))));
+            },
+            set: static function ($value): string {
+                if (is_array($value)) {
+                    return implode(',', array_values(array_filter(array_map('strval', $value))));
+                }
+
+                return (string) $value;
+            }
+        );
+    }
+
     /**
      * Equivalent of legacy getActiveNotifications()
      * Active = scheduled_at <= now AND (expires_at is null OR expires_at > now)