tests: fix mock user object

tests/test_wcs.py

@@ -251,6 +251,8 @@ def test_current_forms_cell_render():
 
     class MockUser(object):
         email = 'foo@example.net'
+        def is_authenticated(self):
+            return True
     context['user'] = MockUser()
 
     # default is to get current forms from all wcs sites
@@ -311,6 +313,8 @@ def test_current_drafts_cell_render():
     context = Context({'synchronous': True})
     class MockUser(object):
         email = 'foo@example.net'
+        def is_authenticated(self):
+            return True
     context['user'] = MockUser()
     context['synchronous'] = True # to force fresh content