from datetime import date
from decimal import Decimal
import random

from django.test import TestCase
from django.contrib.auth.models import AnonymousUser

import plata
from plata.contact.models import Contact

from plata.product.models import TaxClass, Product, ProductVariation,\
    ProductPrice, OptionGroup, Option
from plata.product.stock.models import Period, StockTransaction
from plata.shop.models import Order, OrderStatus, OrderPayment


class Empty(object):
    pass


def get_request(**kwargs):
    """
    Helper method which creates a mock request object
    """

    request = Empty()
    request.session = {}
    request.user = AnonymousUser()

    for k, v in kwargs.items():
       setattr(request, k, v)

    return request


class PlataTest(TestCase):
    def assertRaisesWithCode(self, exception, fn, code):
        try:
            fn()
        except exception, e:
            if e.code == code:
                return True
            raise
        raise Exception, '%s did not raise %s' % (fn, exception)

    def setUp(self):
        plata.settings.PLATA_PRICE_INCLUDES_TAX = True

    def create_contact(self):
        return Contact.objects.create(
            billing_company=u'BigCorp',
            billing_first_name=u'Hans',
            billing_last_name=u'Muster',
            billing_address=u'Musterstrasse 42',
            billing_zip_code=u'8042',
            billing_city=u'Beispielstadt',
            billing_country=u'CH',
            shipping_same_as_billing=True,
            currency='CHF',
            )

    def create_order(self, contact=None):
        contact = contact or self.create_contact()

        return Order.objects.create(
            contact=contact,
            currency='CHF',
            )

    def create_tax_classes(self):
        self.tax_class, created = TaxClass.objects.get_or_create(
            name='Standard Swiss Tax Rate',
            rate=Decimal('7.60'),
            )

        self.tax_class_germany, created = TaxClass.objects.get_or_create(
            name='Umsatzsteuer (Germany)',
            rate=Decimal('19.60'),
            )

        self.tax_class_something, created = TaxClass.objects.get_or_create(
            name='Some tax rate',
            rate=Decimal('12.50'),
            )

        return self.tax_class, self.tax_class_germany, self.tax_class_something


    def create_product(self):
        tax_class, tax_class_germany, tax_class_something = self.create_tax_classes()

        product = Product.objects.create(
            name='Test Product 1',
            slug='prod%s' % random.random(),
            )

        product.create_variations()

        # An old price in CHF which should not influence the rest of the tests
        product.prices.create(
            currency='CHF',
            tax_class=tax_class,
            _unit_price=Decimal('99.90'),
            tax_included=True,
            )

        product.prices.create(
            currency='CHF',
            tax_class=tax_class,
            _unit_price=Decimal('79.90'),
            tax_included=True,
            is_sale=True,
            )

        product.prices.create(
            currency='EUR',
            tax_class=tax_class_germany,
            _unit_price=Decimal('49.90'),
            tax_included=True,
            )

        product.prices.create(
            currency='ASDF',
            tax_class=tax_class_something,
            _unit_price=Decimal('65.00'),
            tax_included=False,
            )

        # A few prices which are not yet (or no more) active
        product.prices.create(
            currency='CHF',
            tax_class=tax_class,
            _unit_price=Decimal('110.00'),
            tax_included=True,
            is_active=False,
            )

        product.prices.create(
            currency='CHF',
            tax_class=tax_class,
            _unit_price=Decimal('120.00'),
            tax_included=True,
            is_active=True,
            valid_from=date(2100, 1, 1),
            )

        product.prices.create(
            currency='CHF',
            tax_class=tax_class,
            _unit_price=Decimal('130.00'),
            tax_included=True,
            is_active=True,
            valid_from=date(2000, 1, 1),
            valid_until=date(2001, 1, 1),
            )

        return product

@@ -2461,24 +2461,79 @@
 _classes()%0A%0A
+        Product = plata.shop_instance().product_model%0A%0A
         prod

Use shop product model instead of hard-coding the model