content.response is supposed to be binary data.

tests/features/steps/homepage_steps.py

 
 @then('page includes "{text}"')
 def step(context, text):
-    ok_(text.encode('utf8') in context.response.content,
+    ok_(text.encode('utf8') in context.response.content.decode('utf8'),
         "%r not page content" % text)

tests/functional/dashboard/dashboard_tests.py

                 'dashboard:users-index',)
         for name in urls:
             response = self.client.get(reverse(name))
-            self.assertTrue('Password' not in response.content)
+            self.assertTrue('Password' not in response.content.decode('utf8'))
 
     def test_includes_hourly_report_with_no_orders(self):
         report = IndexView().get_hourly_report()

tests/functional/dashboard/page_tests.py

 
     def test_dashboard_index_is_for_staff_only(self):
         response = self.client.get(reverse('dashboard:page-list'))
-        self.assertTrue('Password' not in response.content)
+        self.assertTrue('Password' not in response.content.decode('utf8'))
 
     def test_dashboard_page_list(self):
         response = self.client.get(reverse('dashboard:page-list'))