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--- a/Allura/allura/tests/model/test_repo.py
+++ b/Allura/allura/tests/model/test_repo.py
@@ -128,6 +128,7 @@
                 repo=self.repo,
             )
         commit.tree = self._build_tree(commit, '/', tree_paths)
+        commit.get_tree = lambda c: commit.tree
         diffinfo = M.repo.DiffInfoDoc(dict(
                 _id=commit._id,
                 differences=[{'name': p} for p in diff_paths or tree_paths],