diff --git a/tests/Fixtures/BuyableProductTrait.php b/tests/Fixtures/BuyableProductTrait.php
index 4386b9e..aa2c701 100644
--- a/tests/Fixtures/BuyableProductTrait.php
+++ b/tests/Fixtures/BuyableProductTrait.php
@@ -8,4 +8,11 @@ use Illuminate\Database\Eloquent\Model;
 class BuyableProductTrait extends Model implements Buyable
 {
     use \Gloudemans\Shoppingcart\CanBeBought;
+    
+    protected $attributes = [
+        'id'  => 1,
+        'name' => 'Item name',
+        'price' => 10.00,
+        'weight' => 0,
+    ];
 }