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diff --git a/src/mailman/app/tests/test_workflow.py b/src/mailman/app/tests/test_workflow.py
deleted file mode 100644
index e82001540..000000000
--- a/src/mailman/app/tests/test_workflow.py
+++ /dev/null
@@ -1,183 +0,0 @@
-# Copyright (C) 2015-2017 by the Free Software Foundation, Inc.
-#
-# This file is part of GNU Mailman.
-#
-# GNU Mailman 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 3 of the License, or (at your option)
-# any later version.
-#
-# GNU Mailman 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
-# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
-
-"""App-level workflow tests."""
-
-import json
-import unittest
-
-from mailman.app.workflow import Workflow
-from mailman.interfaces.workflow import IWorkflowStateManager
-from mailman.testing.layers import ConfigLayer
-from zope.component import getUtility
-
-
-class MyWorkflow(Workflow):
-    INITIAL_STATE = 'first'
-    SAVE_ATTRIBUTES = ('ant', 'bee', 'cat')
-
-    def __init__(self):
-        super().__init__()
-        self.token = 'test-workflow'
-        self.ant = 1
-        self.bee = 2
-        self.cat = 3
-        self.dog = 4
-
-    def _step_first(self):
-        self.push('second')
-        return 'one'
-
-    def _step_second(self):
-        self.push('third')
-        return 'two'
-
-    def _step_third(self):
-        return 'three'
-
-
-class DependentWorkflow(MyWorkflow):
-    SAVE_ATTRIBUTES = ('ant', 'bee', 'cat', 'elf')
-
-    def __init__(self):
-        super().__init__()
-        self._elf = 5
-
-    @property
-    def elf(self):
-        return self._elf
-
-    @elf.setter
-    def elf(self, value):
-        # This attribute depends on other attributes.
-        assert self.ant is not None
-        assert self.bee is not None
-        assert self.cat is not None
-        self._elf = value
-
-
-class TestWorkflow(unittest.TestCase):
-    layer = ConfigLayer
-
-    def setUp(self):
-        self._workflow = iter(MyWorkflow())
-
-    def test_basic_workflow(self):
-        # The work flows from one state to the next.
-        results = list(self._workflow)
-        self.assertEqual(results, ['one', 'two', 'three'])
-
-    def test_partial_workflow(self):
-        # You don't have to flow through every step.
-        results = next(self._workflow)
-        self.assertEqual(results, 'one')
-
-    def test_exhaust_workflow(self):
-        # Manually flow through a few steps, then consume the whole thing.
-        results = [next(self._workflow)]
-        results.extend(self._workflow)
-        self.assertEqual(results, ['one', 'two', 'three'])
-
-    def test_save_and_restore_workflow(self):
-        # Without running any steps, save and restore the workflow.  Then
-        # consume the restored workflow.
-        self._workflow.save()
-        new_workflow = MyWorkflow()
-        new_workflow.restore()
-        results = list(new_workflow)
-        self.assertEqual(results, ['one', 'two', 'three'])
-
-    def test_save_and_restore_partial_workflow(self):
-        # After running a few steps, save and restore the workflow.  Then
-        # consume the restored workflow.
-        next(self._workflow)
-        self._workflow.save()
-        new_workflow = MyWorkflow()
-        new_workflow.restore()
-        results = list(new_workflow)
-        self.assertEqual(results, ['two', 'three'])
-
-    def test_save_and_restore_exhausted_workflow(self):
-        # After consuming the entire workflow, save and restore it.
-        list(self._workflow)
-        self._workflow.save()
-        new_workflow = MyWorkflow()
-        new_workflow.restore()
-        results = list(new_workflow)
-        self.assertEqual(len(results), 0)
-
-    def test_save_and_restore_attributes(self):
-        # Saved attributes are restored.
-        self._workflow.ant = 9
-        self._workflow.bee = 8
-        self._workflow.cat = 7
-        # Don't save .dog.
-        self._workflow.save()
-        new_workflow = MyWorkflow()
-        new_workflow.restore()
-        self.assertEqual(new_workflow.ant, 9)
-        self.assertEqual(new_workflow.bee, 8)
-        self.assertEqual(new_workflow.cat, 7)
-        self.assertEqual(new_workflow.dog, 4)
-
-    def test_save_and_restore_dependant_attributes(self):
-        # Attributes must be restored in the order they are declared in
-        # SAVE_ATTRIBUTES.
-        workflow = iter(DependentWorkflow())
-        workflow.elf = 6
-        workflow.save()
-        new_workflow = DependentWorkflow()
-        # The elf attribute must be restored last, set triggering values for
-        # attributes it depends on.
-        new_workflow.ant = new_workflow.bee = new_workflow.cat = None
-        new_workflow.restore()
-        self.assertEqual(new_workflow.elf, 6)
-
-    def test_save_and_restore_obsolete_attributes(self):
-        # Obsolete saved attributes are ignored.
-        state_manager = getUtility(IWorkflowStateManager)
-        # Save the state of an old version of the workflow that would not have
-        # the cat attribute.
-        state_manager.save(
-            self._workflow.token, 'first',
-            json.dumps({'ant': 1, 'bee': 2}))
-        # Restore in the current version that needs the cat attribute.
-        new_workflow = MyWorkflow()
-        try:
-            new_workflow.restore()
-        except KeyError:
-            self.fail('Restore does not handle obsolete attributes')
-        # Restoring must not raise an exception, the default value is kept.
-        self.assertEqual(new_workflow.cat, 3)
-
-    def test_run_thru(self):
-        # Run all steps through the given one.
-        results = self._workflow.run_thru('second')
-        self.assertEqual(results, ['one', 'two'])
-
-    def test_run_thru_completes(self):
-        results = self._workflow.run_thru('all of them')
-        self.assertEqual(results, ['one', 'two', 'three'])
-
-    def test_run_until(self):
-        # Run until (but not including) the given step.
-        results = self._workflow.run_until('second')
-        self.assertEqual(results, ['one'])
-
-    def test_run_until_completes(self):
-        results = self._workflow.run_until('all of them')
-        self.assertEqual(results, ['one', 'two', 'three'])