diff -r 9fec62e076a1 purchase.py
--- a/purchase.py       Mon Apr 22 12:18:26 2013 +0200
+++ b/purchase.py       Thu May 23 16:29:04 2013 +0200
@@ -11,7 +11,9 @@

     @classmethod
     def __setup__(cls):
+        print "coin1" * 10
         super(PurchaseLine, cls).__setup__()
+        print "coin2" * 10
         cls._error_messages.update({
                 'missing_account_asset': ('It misses '
                     'an "Account Asset" on product "%s"!'),