diff --git a/tests/drawdag.py b/tests/drawdag.py
--- a/tests/drawdag.py
+++ b/tests/drawdag.py
@@ -300,6 +300,12 @@
     def commit(self):
         return self._repo.commitctx(self)
 
+    def p1copies(self):
+        return {}
+
+    def p2copies(self):
+        return {}
+
 def _walkgraph(edges):
     """yield node, parents in topologically order"""
     visible = set(edges.keys())