diff --git a/tests/events/__init__.py b/tests/events/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/events/__init__.py
diff --git a/tests/events/test_utils.py b/tests/events/test_utils.py
new file mode 100644
index 0000000000..16179921f0
--- /dev/null
+++ b/tests/events/test_utils.py
@@ -0,0 +1,115 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 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 .. import unittest
+
+from synapse.events import FrozenEvent
+from synapse.events.utils import prune_event
+
+class PruneEventTestCase(unittest.TestCase):
+ """ Asserts that a new event constructed with `evdict` will look like
+ `matchdict` when it is redacted. """
+ def run_test(self, evdict, matchdict):
+ self.assertEquals(
+ prune_event(FrozenEvent(evdict)).get_dict(),
+ matchdict
+ )
+
+ def test_minimal(self):
+ self.run_test(
+ {'type': 'A'},
+ {
+ 'type': 'A',
+ 'content': {},
+ 'signatures': {},
+ 'unsigned': {},
+ }
+ )
+
+ def test_basic_keys(self):
+ self.run_test(
+ {
+ 'type': 'A',
+ 'room_id': '!1:domain',
+ 'sender': '@2:domain',
+ 'event_id': '$3:domain',
+ 'origin': 'domain',
+ },
+ {
+ 'type': 'A',
+ 'room_id': '!1:domain',
+ 'sender': '@2:domain',
+ 'event_id': '$3:domain',
+ 'origin': 'domain',
+ 'content': {},
+ 'signatures': {},
+ 'unsigned': {},
+ }
+ )
+
+ def test_unsigned_age_ts(self):
+ self.run_test(
+ {
+ 'type': 'B',
+ 'unsigned': {'age_ts': 20},
+ },
+ {
+ 'type': 'B',
+ 'content': {},
+ 'signatures': {},
+ 'unsigned': {'age_ts': 20},
+ }
+ )
+
+ self.run_test(
+ {
+ 'type': 'B',
+ 'unsigned': {'other_key': 'here'},
+ },
+ {
+ 'type': 'B',
+ 'content': {},
+ 'signatures': {},
+ 'unsigned': {},
+ }
+ )
+
+ def test_content(self):
+ self.run_test(
+ {
+ 'type': 'C',
+ 'content': {'things': 'here'},
+ },
+ {
+ 'type': 'C',
+ 'content': {},
+ 'signatures': {},
+ 'unsigned': {},
+ }
+ )
+
+ self.run_test(
+ {
+ 'type': 'm.room.create',
+ 'content': {'creator': '@2:domain', 'other_field': 'here'},
+ },
+ {
+ 'type': 'm.room.create',
+ 'content': {'creator': '@2:domain'},
+ 'signatures': {},
+ 'unsigned': {},
+ }
+ )
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