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--- a/Allura/allura/tests/model/test_artifact.py
+++ b/Allura/allura/tests/model/test_artifact.py
@@ -149,3 +149,11 @@
     assert 'author_display_name_t' in idx
     assert 'timestamp_dt' in idx
     assert m.shorthand_id() == m.slug
+
+@with_setup(setUp, tearDown)
+def test_messages_unknown_lookup():
+    from bson import ObjectId
+    m = Checkmessage()
+    m.author_id = ObjectId() # something new
+    assert type(m.author()) == M.User, type(m.author())
+    assert m.author() == M.User.anonymous()