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--- a/Allura/allura/tests/model/test_repo.py
+++ b/Allura/allura/tests/model/test_repo.py
@@ -13,7 +13,6 @@
 from alluratest.controller import setup_basic_test, setup_global_objects
 from allura import model as M
 from allura.lib import helpers as h
-
 
 class _Test(unittest.TestCase):
     idgen = ( 'obj_%d' % i for i in count())
@@ -47,6 +46,7 @@
         self.repo._impl = mock.Mock(spec=M.RepositoryImplementation())
         self.repo._impl.log = lambda *a,**kw:(['foo'], [])
         self.repo._impl._repo = self.repo
+        self.repo._impl.all_commit_ids = lambda *a,**kw: []
         ThreadLocalORMSession.flush_all()
         ThreadLocalORMSession.close_all()