diff --git a/tests/testutil.py b/tests/testutil.py
index 583de75a1a9cd2ed47bc37cad028c499c2984e76..c1b45804f84c462e7d61a694d2e231941230b205 100644
--- a/tests/testutil.py
+++ b/tests/testutil.py
@@ -69,16 +69,19 @@ def test_path(s):
 def Amount(number, currency='USD'):
     return bc_amount.Amount(Decimal(number), currency)
 
+def Cost(number, currency='USD', date=FY_MID_DATE, label=None):
+    return bc_data.Cost(Decimal(number), currency, date, label)
+
 def Posting(account, number,
             currency='USD', cost=None, price=None, flag=None,
             **meta):
-    if not (number is None or isinstance(number, Decimal)):
-        number = Decimal(number)
+    if cost is not None:
+        cost = Cost(*cost)
     if meta is None:
         meta = None
     return bc_data.Posting(
         account,
-        bc_amount.Amount(number, currency),
+        Amount(number, currency),
         cost,
         price,
         flag,