[FIX] product : Improved the test cases.

bzr revid: mdi@tinyerp.com-20120919131305-gyn847qpagdujq0h

addons/product/product_pricelist_demo.yml

@@ -47,7 +47,7 @@
             - name: 20% Discount given by my supplier
               sequence: 1
               price_min_margin: 2
-              price_max_margin: -5
+              price_max_margin: 5
               product_id: product_product_6
               base: -2
 -

addons/product/test/product_pricelist.yml

@@ -49,14 +49,14 @@
   !python {model: product.product}: |
     context.update({'quantity':1, 'date': False, 'partner': ref('base.res_partner_4'), 'pricelist': ref("supplier_pricelist")})
     product = self.browse(cr, uid, ref("product_product_6"), context=context)
-    assert product.price == 785, "cost price is not correspond."
+    assert product.price == 792, "cost price is not correspond."
 -
   I check cost price of LCD Monitor if more than 3 Unit.
 -
   !python {model: product.product}: |
     context.update({'quantity':3})
     product = self.browse(cr, uid, ref("product_product_6"), context=context)
-    assert product.price == 780, "cost price is not correspond."
+    assert product.price == 787, "cost price is not correspond."
 
 -
  I print the sale prices report.