Resolve "subscription ended on submit"

Closes #139 (closed)

functional_tests/test_feedback_creation.py

@@ -227,7 +227,8 @@ class UntestedParent:
             self.write_comments_on_lines([(0, 'I disagree'), (1, 'Full points!')])
             self.browser.find_element_by_id('score-full').click()
             self.browser.find_element_by_id('submit-feedback').click()
-            WebDriverWait(self.browser, 10).until(ec.url_contains('subscription/ended'))
+            sub_url = 'subscription/' + str(self.sub_type.pk) + '/ended'
+            WebDriverWait(self.browser, 10).until(ec.url_contains(sub_url))
             submission_for_code = Submission.objects.get(text=code)
             self.assertEqual(self.sub_type.full_score, submission_for_code.feedback.score)
             self.assertEqual(3, submission_for_code.feedback.feedback_lines.count())