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diff --git a/src/mailman/commands/tests/test_cli_import.py b/src/mailman/commands/tests/test_cli_import.py
new file mode 100644
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+++ b/src/mailman/commands/tests/test_cli_import.py
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+# 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/>.
+
+"""Test the `mailman import21` subcommand."""
+
+import unittest
+
+from click.testing import CliRunner
+from mailman.app.lifecycle import create_list
+from mailman.commands.cli_import import import21
+from mailman.testing.layers import ConfigLayer
+from mailman.utilities.importer import Import21Error
+from pickle import dump
+from pkg_resources import resource_filename
+from tempfile import NamedTemporaryFile
+from unittest.mock import patch
+
+
+class TestImport(unittest.TestCase):
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._command = CliRunner()
+        self.mlist = create_list('ant@example.com')
+
+    @patch('mailman.commands.cli_import.import_config_pck')
+    def test_process_pickle_with_bounce_info(self, import_config_pck):
+        # The sample data contains Mailman 2 bounce info, represented as
+        # _BounceInfo instances.  We throw these away when importing to
+        # Mailman 3, but we have to fake the instance's classes, otherwise
+        # unpickling the dictionaries will fail.
+        pckfile = resource_filename(
+            'mailman.testing', 'config-with-instances.pck')
+        try:
+            self._command.invoke(import21, ('ant.example.com', pckfile))
+        except ImportError as error:
+            self.fail('The pickle failed loading: {}'.format(error))
+        self.assertTrue(import_config_pck.called)
+
+    def test_missing_list_spec(self):
+        result = self._command.invoke(import21)
+        self.assertEqual(result.exit_code, 2, result.output)
+        self.assertEqual(
+            result.output,
+            'Usage: import21 [OPTIONS] LISTSPEC PICKLE_FILE\n\n'
+            'Error: Missing argument "listspec".\n')
+
+    def test_pickle_with_nondict(self):
+        with NamedTemporaryFile() as pckfile:
+            with open(pckfile.name, 'wb') as fp:
+                dump(['not', 'a', 'dict'], fp)
+            result = self._command.invoke(
+                import21, ('ant.example.com', pckfile.name))
+            self.assertIn('Ignoring non-dictionary', result.output)
+
+    def test_pickle_with_bad_language(self):
+        pckfile = resource_filename('mailman.testing', 'config.pck')
+        with patch('mailman.utilities.importer.check_language_code',
+                   side_effect=Import21Error('Fake bad language code')):
+            result = self._command.invoke(
+                import21, ('ant.example.com', pckfile))
+            self.assertIn('Fake bad language code', result.output)