test: hoist defaults to function signature
diff --git a/erpnext/stock/doctype/item/test_item.py b/erpnext/stock/doctype/item/test_item.py
index 7cd6050..9694927 100644
--- a/erpnext/stock/doctype/item/test_item.py
+++ b/erpnext/stock/doctype/item/test_item.py
@@ -530,23 +530,24 @@
 
 test_records = frappe.get_test_records('Item')
 
-def create_item(item_code, is_stock_item=None, valuation_rate=0, warehouse=None, is_customer_provided_item=None,
-	customer=None, is_purchase_item=None, opening_stock=None, company=None):
+def create_item(item_code, is_stock_item=1, valuation_rate=0, warehouse="_Test Warehouse - _TC",
+		is_customer_provided_item=None, customer=None, is_purchase_item=None, opening_stock=0,
+		company="_Test Company"):
 	if not frappe.db.exists("Item", item_code):
 		item = frappe.new_doc("Item")
 		item.item_code = item_code
 		item.item_name = item_code
 		item.description = item_code
 		item.item_group = "All Item Groups"
-		item.is_stock_item = is_stock_item or 1
-		item.opening_stock = opening_stock or 0
-		item.valuation_rate = valuation_rate or 0.0
+		item.is_stock_item = is_stock_item
+		item.opening_stock = opening_stock
+		item.valuation_rate = valuation_rate
 		item.is_purchase_item = is_purchase_item
 		item.is_customer_provided_item = is_customer_provided_item
 		item.customer = customer or ''
 		item.append("item_defaults", {
-			"default_warehouse": warehouse or '_Test Warehouse - _TC',
-			"company": company or "_Test Company"
+			"default_warehouse": warehouse,
+			"company": company
 		})
 		item.save()
 	else: