Updated create_product test helper to accept extra kwargs

oscar/test/helpers.py

 from oscar.apps.product.models import ItemClass, Item
 from oscar.apps.stock.models import Partner, StockRecord
 
-def create_product(price=None):
+def create_product(price=None, title="Dummy title", item_class="Dummy item class", partner="Dummy partner"):
     u"""
-    Helper method for creating products that are used in 
-    tests.
+    Helper method for creating products that are used in tests.
     """
-    ic,_ = ItemClass._default_manager.get_or_create(name="Dummy item class")
-    item = Item._default_manager.create(title="Dummy product", item_class=ic)
+    ic,_ = ItemClass._default_manager.get_or_create(name=item_class)
+    item = Item._default_manager.create(title=title, item_class=ic)
     if price:
-        partner,_ = Partner._default_manager.get_or_create(name="Dummy partner")
+        partner,_ = Partner._default_manager.get_or_create(name=partner)
         sr = StockRecord._default_manager.create(product=item, partner=partner, price_excl_tax=price)
     return item