1 files changed, 79 insertions, 0 deletions
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