Test expected output instead of comparison in doctest

modules/carrier_weight/tests/scenario_carrier_weight.rst

@@ -167,8 +167,8 @@ Sale products with cost on shipment::
     >>> cost_line = sale.lines[-1]
     >>> cost_line.product == carrier_product
     True
-    >>> cost_line.quantity == 1
-    True
+    >>> cost_line.quantity
+    1.0
     >>> cost_line.amount
     Decimal('40.00')
     >>> sale.click('confirm')
@@ -235,8 +235,8 @@ Sale products with cost on order::
     >>> cost_line = sale.lines[-1]
     >>> cost_line.product == carrier_product
     True
-    >>> cost_line.quantity == 1
-    True
+    >>> cost_line.quantity
+    1.0
     >>> cost_line.amount
     Decimal('25.00')
     >>> sale.click('confirm')