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diff --git a/src/mailman/styles/tests/test_styles.py b/src/mailman/styles/tests/test_styles.py
new file mode 100644
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+++ b/src/mailman/styles/tests/test_styles.py
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+# Copyright (C) 2012 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 styles."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'TestStyle',
+    ]
+
+
+import unittest
+
+from zope.component import getUtility
+from zope.interface import implements
+from zope.interface.exceptions import DoesNotImplement
+
+from mailman.interfaces.styles import (
+    DuplicateStyleError, IStyle, IStyleManager)
+from mailman.testing.layers import ConfigLayer
+
+
+
+class DummyStyle:
+    implements(IStyle)
+
+    name = 'dummy'
+    priority = 1
+
+    def apply(self, mlist):
+        pass
+
+    def match(self, mlist, styles):
+        styles.append(self)
+
+
+
+class TestStyle(unittest.TestCase):
+    """Test styles."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self.manager = getUtility(IStyleManager)
+
+    def test_register_style_again(self):
+        # Registering a style with the same name as a previous style raises an
+        # exception.
+        self.manager.register(DummyStyle())
+        try:
+            self.manager.register(DummyStyle())
+        except DuplicateStyleError:
+            pass
+        else:
+            raise AssertionError('DuplicateStyleError exception expected')
+
+    def test_register_a_non_style(self):
+        # You can't register something that doesn't implement the IStyle
+        # interface.
+        try:
+            self.manager.register(object())
+        except DoesNotImplement:
+            pass
+        else:
+            raise AssertionError('DoesNotImplement exception expected')
+
+    def test_unregister_a_non_registered_style(self):
+        # You cannot unregister a style that hasn't yet been registered.
+        try:
+            self.manager.unregister(DummyStyle())
+        except KeyError:
+            pass
+        else:
+            raise AssertionError('KeyError expected')