1 files changed, 42 insertions, 0 deletions
diff --git a/src/mailman/bin/tests/test_mailman.py b/src/mailman/bin/tests/test_mailman.py
new file mode 100644
index 000000000..8c5a3396b
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+++ b/src/mailman/bin/tests/test_mailman.py
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+# Copyright (C) 2015 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 mailman command utilities."""
+
+__all__ = [
+    'TestMailmanCommand',
+    ]
+
+
+import unittest
+
+from io import StringIO
+from mock import patch
+from mailman.bin.mailman import main
+
+
+
+class TestMailmanCommand(unittest.TestCase):
+    def test_mailman_command_without_subcommand_prints_help(self):
+        # Issue #137: Running `mailman` without a subcommand raises an
+        # AttributeError.
+        testargs = ['mailman']
+        output = StringIO()
+        with patch('sys.argv', testargs), patch('sys.stdout', output):
+            with self.assertRaises(SystemExit):
+                main()
+        self.assertIn('usage', output.getvalue())