Fix tests for stock serialization

InvenTree/stock/models.py

@@ -359,6 +359,7 @@ class StockItem(models.Model):
 
         Brief automated note detailing a movement or quantity change.
         """
+        
         track = StockItemTracking.objects.create(
             item=self,
             title=title,
@@ -373,7 +374,7 @@ class StockItem(models.Model):
         track.save()
 
     @transaction.atomic
-    def serializeStock(self, quantity, serials, user, notes=None, location=None):
+    def serializeStock(self, quantity, serials, user, notes='', location=None):
         """ Split this stock item into unique serial numbers.
 
         - Quantity can be less than or equal to the quantity of the stock item

InvenTree/stock/tests.py

@@ -264,24 +264,24 @@ class StockTest(TestCase):
         # Test serialization of non-serializable part
         item = StockItem.objects.get(pk=1234)
 
-        with self.assertRaises(ValueError):
+        with self.assertRaises(ValidationError):
             item.serializeStock(5, [1, 2, 3, 4, 5], self.user)
 
         # Pick a StockItem which can actually be serialized
         item = StockItem.objects.get(pk=100)
 
         # Try an invalid quantity
-        with self.assertRaises(ValueError):
+        with self.assertRaises(ValidationError):
             item.serializeStock("k", [], self.user)
 
-        with self.assertRaises(ValueError):
+        with self.assertRaises(ValidationError):
             item.serializeStock(-1, [], self.user)
 
         # Try invalid serial numbers
-        with self.assertRaises(ValueError):
+        with self.assertRaises(ValidationError):
             item.serializeStock(3, [1, 2, 'k'], self.user)
 
-        with self.assertRaises(ValueError):
+        with self.assertRaises(ValidationError):
             item.serializeStock(3, "hello", self.user)
 
     def test_seiralize_stock_valid(self):