adding failing test for missing page_url field

tests/unit/dashboard/promotions_form_tests.py

@@ -0,0 +1,19 @@
+from django.test import TestCase
+
+from oscar.apps.dashboard.promotions import forms
+from oscar.core.loading import get_classes
+
+RawHTML, PagePromotion = get_classes('promotions.models', ['RawHTML', 'PagePromotion'])
+
+
+class TestPagePromotionForm(TestCase):
+
+    def test_page_promotion_has_fields(self):
+        promotion = RawHTML()
+        promotion.save()
+        instance = PagePromotion(content_object=promotion)
+        data = {'position': 'page', 'page_url': '/'}
+        form = forms.PagePromotionForm(data=data, instance=instance)
+        self.assertTrue(form.is_valid())
+        page_promotion = form.save()
+        self.assertEqual(page_promotion.page_url, '/')