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diff --git a/src/mailman/commands/tests/test_eml_membership.py b/src/mailman/commands/tests/test_eml_membership.py
new file mode 100644
index 000000000..6cf4802c6
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+++ b/src/mailman/commands/tests/test_eml_membership.py
@@ -0,0 +1,54 @@
+# Copyright (C) 2016-2017 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/>.
+
+"""Test the Leave command."""
+
+import unittest
+
+from mailman.app.lifecycle import create_list
+from mailman.commands.eml_membership import Leave
+from mailman.email.message import Message
+from mailman.interfaces.mailinglist import SubscriptionPolicy
+from mailman.interfaces.usermanager import IUserManager
+from mailman.runners.command import Results
+from mailman.testing.helpers import set_preferred
+from mailman.testing.layers import ConfigLayer
+from zope.component import getUtility
+
+
+class TestLeave(unittest.TestCase):
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._mlist = create_list('ant@example.com')
+        self._command = Leave()
+
+    def test_confirm_leave_not_a_member(self):
+        self._mlist.unsubscription_policy = SubscriptionPolicy.confirm
+        # Try to unsubscribe someone who is not a member.  Anne is a real
+        # user, with a validated address, but she is not a member of the
+        # mailing list.
+        anne = getUtility(IUserManager).create_user('anne@example.com')
+        set_preferred(anne)
+        # Initiate an unsubscription.
+        msg = Message()
+        msg['From'] = 'anne@example.com'
+        results = Results()
+        self._command.process(self._mlist, msg, {}, (), results)
+        self.assertEqual(
+            str(results).splitlines()[-1],
+            'leave: anne@example.com is not a member of ant@example.com')