diff --git a/tests/drawdag.py b/tests/drawdag.py
--- a/tests/drawdag.py
+++ b/tests/drawdag.py
@@ -288,8 +288,7 @@
             'date': b'0 0',
             'extra': {b'branch': b'default'},
         }
-        super(simplecommitctx, self).__init__(self, name, **opts)
-        self._repo = repo
+        super(simplecommitctx, self).__init__(repo, name, **opts)
         self._added = added
         self._parents = parentctxs
         while len(self._parents) < 2: