Have all unit tests import from our own subclass of trial's unittest TestCase; set up logging in ONE PLACE ONLY

tests/unittest.py

@@ -0,0 +1,30 @@
+# -*- 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)
+
+
+class TestCase(unittest.TestCase):
+    pass