Activity.deserialize() correctly accesses its list of types.

First test for it (which found the above bug).

django_kepi/models.py

@@ -510,7 +510,7 @@ class Activity(models.Model):
                 }
 
         try:
-            need_actor, need_object, need_target = TYPES[value['type']]
+            need_actor, need_object, need_target = cls.TYPES[value['type']]
         except KeyError:
             raise ValueError('{} is not an Activity type'.format(value['type']))
 

tests/test_activity.py

@@ -0,0 +1,12 @@
+from django.test import TestCase
+from django_kepi.models import Activity
+
+class TestActivity(TestCase):
+
+    def test_parameters(self):
+
+        with self.assertRaisesMessage(ValueError, "is not an Activity type"):
+                Activity.deserialize({
+                    "id": "https://example.com/id/1",
+                    "type": "Wombat",
+                    })