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diff --git a/bzrlib/tests/test_upgrade_stacked.py b/bzrlib/tests/test_upgrade_stacked.py
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+++ b/bzrlib/tests/test_upgrade_stacked.py
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+# Copyright (C) 2008, 2009, 2011 Canonical Ltd
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+"""Tests for upgrades of various stacking situations."""
+
+from bzrlib import (
+    controldir,
+    check,
+    errors,
+    tests,
+    )
+from bzrlib.upgrade import upgrade
+from bzrlib.tests.scenarios import load_tests_apply_scenarios
+
+
+def upgrade_scenarios():
+    scenario_pairs = [ # old format, new format, model_change
+#        ('knit', 'rich-root', True),
+        ('knit', '1.6', False),
+#        ('pack-0.92', '1.6', False),
+        ('1.6', '1.6.1-rich-root', True),
+        ]
+    scenarios = []
+    for (old_name, new_name, model_change) in scenario_pairs:
+        name = old_name + ', ' + new_name
+        scenarios.append((name,
+            dict(scenario_old_format=old_name,
+                scenario_new_format=new_name,
+                scenario_model_change=model_change)))
+    return scenarios
+
+
+load_tests = load_tests_apply_scenarios
+
+
+class TestStackUpgrade(tests.TestCaseWithTransport):
+    # TODO: This should possibly be repeated for all stacking repositories,
+    # pairwise by rich/non-rich format; should possibly also try other kinds
+    # of upgrades like knit->pack. -- mbp 20080804
+    
+    scenarios = upgrade_scenarios()
+
+    def test_stack_upgrade(self):
+        """Correct checks when stacked-on repository is upgraded.
+
+        We initially stack on a repo with the same rich root support,
+        we then upgrade it and should fail, we then upgrade the overlaid
+        repository.
+        """
+        base = self.make_branch_and_tree('base',
+            format=self.scenario_old_format)
+        self.build_tree(['base/foo'])
+        base.commit('base commit')
+        # make another one stacked
+        stacked = base.bzrdir.sprout('stacked', stacked=True)
+        # this must really be stacked (or get_stacked_on_url raises an error)
+        self.assertTrue(stacked.open_branch().get_stacked_on_url())
+        # now we'll upgrade the underlying branch, then upgrade the stacked
+        # branch, and this should still work.
+        new_format = controldir.format_registry.make_bzrdir(
+            self.scenario_new_format)
+        upgrade('base', new_format)
+        # in some cases you'll get an error if the underlying model has
+        # changed; if just the data format has changed this should still work
+        if self.scenario_model_change:
+            self.assertRaises(errors.IncompatibleRepositories,
+                stacked.open_branch)
+        else:
+            check.check_dwim('stacked', False, True, True)
+        stacked = controldir.ControlDir.open('stacked')
+        # but we can upgrade the stacked repository
+        upgrade('stacked', new_format)
+        # and now it opens ok
+        stacked = controldir.ControlDir.open('stacked')
+        # And passes check.
+        check.check_dwim('stacked', False, True, True)