add sample products and improve testing for Product

uncloud_pay/models.py

@@ -596,7 +596,6 @@ class BillRecord(models.Model):
 
         return record_delta.total_seconds()/self.order.recurring_period
 
-
     @property
     def sum(self):
         return self.order.price * Decimal(self.quantity)
@@ -604,6 +603,12 @@ class BillRecord(models.Model):
     def __str__(self):
         return f"{self.bill}: {self.quantity} x {self.order}"
 
+    def save(self, *args, **kwargs):
+        if self.ending_date < self.starting_date:
+            raise ValidationError("End date cannot be before starting date")
+
+        super().save(*args, **kwargs)
+
 
 ###
 # Products
@@ -703,13 +708,12 @@ class Product(UncloudModel):
 
     @property
     def recurring_price(self):
-        pass # To be implemented in child.
+        """ implement correct values in the child class """
+        return 0
 
     @property
     def one_time_price(self):
-        """
-        Default is 0 CHF
-        """
+        """ implement correct values in the child class """
         return 0
 
 
@@ -799,3 +803,30 @@ class Product(UncloudModel):
         else:
             # FIXME: use the right type of exception here!
             raise Exception("Did not implement the discounter for this case")
+
+# Sample products included into uncloud
+class SampleOneTimeProduct(Product):
+
+    default_recurring_period = RecurringPeriod.ONE_TIME
+
+    @property
+    def one_time_price(self):
+        return 5
+
+class SampleRecurringProduct(Product):
+    default_recurring_period = RecurringPeriod.PER_30D
+
+    @property
+    def recurring_price(self):
+        return 10
+
+class SampleRecurringProductOneTimeFee(Product):
+    default_recurring_period = RecurringPeriod.PER_30D
+
+    @property
+    def one_time_price(self):
+        return 5
+
+    @property
+    def recurring_price(self):
+        return 1