diff --git a/tests/unittest.py b/tests/unittest.py
new file mode 100644
index 0000000000..fb97fb1148
--- /dev/null
+++ b/tests/unittest.py
@@ -0,0 +1,79 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from twisted.trial import unittest
+
+import logging
+
+
+# logging doesn't have a "don't log anything at all EVARRRR setting,
+# but since the highest value is 50, 1000000 should do ;)
+NEVER = 1000000
+
+logging.getLogger().addHandler(logging.StreamHandler())
+logging.getLogger().setLevel(NEVER)
+
+
+def around(target):
+ """A CLOS-style 'around' modifier, which wraps the original method of the
+ given instance with another piece of code.
+
+ @around(self)
+ def method_name(orig, *args, **kwargs):
+ return orig(*args, **kwargs)
+ """
+ def _around(code):
+ name = code.__name__
+ orig = getattr(target, name)
+ def new(*args, **kwargs):
+ return code(orig, *args, **kwargs)
+ setattr(target, name, new)
+ return _around
+
+
+class TestCase(unittest.TestCase):
+ """A subclass of twisted.trial's TestCase which looks for 'loglevel'
+ attributes on both itself and its individual test methods, to override the
+ root logger's logging level while that test (case|method) runs."""
+
+ def __init__(self, methodName, *args, **kwargs):
+ super(TestCase, self).__init__(methodName, *args, **kwargs)
+
+ method = getattr(self, methodName)
+
+ level = getattr(method, "loglevel",
+ getattr(self, "loglevel",
+ NEVER))
+
+ @around(self)
+ def setUp(orig):
+ old_level = logging.getLogger().level
+
+ if old_level != level:
+ @around(self)
+ def tearDown(orig):
+ ret = orig()
+ logging.getLogger().setLevel(old_level)
+ return ret
+
+ logging.getLogger().setLevel(level)
+ return orig()
+
+
+def DEBUG(target):
+ """A decorator to set the .loglevel attribute to logging.DEBUG.
+ Can apply to either a TestCase or an individual test method."""
+ target.loglevel = logging.DEBUG
+ return target
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