diff --git a/tests/test_visibility.py b/tests/test_visibility.py
new file mode 100644
index 0000000000..86981958cb
--- /dev/null
+++ b/tests/test_visibility.py
@@ -0,0 +1,107 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector 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.
+import logging
+
+from twisted.internet import defer
+
+from synapse.visibility import filter_events_for_server
+from tests import unittest
+from tests.utils import setup_test_homeserver
+
+logger = logging.getLogger(__name__)
+
+TEST_ROOM_ID = "!TEST:ROOM"
+
+
+class FilterEventsForServerTestCase(unittest.TestCase):
+ @defer.inlineCallbacks
+ def setUp(self):
+ self.hs = yield setup_test_homeserver()
+ self.event_creation_handler = self.hs.get_event_creation_handler()
+ self.event_builder_factory = self.hs.get_event_builder_factory()
+ self.store = self.hs.get_datastore()
+
+ @defer.inlineCallbacks
+ def test_filtering(self):
+ #
+ # The events to be filtered consist of 10 membership events (it doesn't
+ # really matter if they are joins or leaves, so let's make them joins).
+ # One of those membership events is going to be for a user on the
+ # server we are filtering for (so we can check the filtering is doing
+ # the right thing).
+ #
+
+ # before we do that, we persist some other events to act as state.
+ self.inject_visibility("@admin:hs", "joined")
+ for i in range(0, 10):
+ yield self.inject_room_member("@resident%i:hs" % i)
+
+ events_to_filter = []
+
+ for i in range(0, 10):
+ user = "@user%i:%s" % (
+ i, "test_server" if i == 5 else "other_server"
+ )
+ evt = yield self.inject_room_member(user, extra_content={"a": "b"})
+ events_to_filter.append(evt)
+
+ filtered = yield filter_events_for_server(
+ self.store, "test_server", events_to_filter,
+ )
+
+ # the result should be 5 redacted events, and 5 unredacted events.
+ for i in range(0, 5):
+ self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
+ self.assertNotIn("a", filtered[i].content)
+
+ for i in range(5, 10):
+ self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
+ self.assertEqual(filtered[i].content["a"], "b")
+
+ @defer.inlineCallbacks
+ def inject_visibility(self, user_id, visibility):
+ content = {"history_visibility": visibility}
+ builder = self.event_builder_factory.new({
+ "type": "m.room.history_visibility",
+ "sender": user_id,
+ "state_key": "",
+ "room_id": TEST_ROOM_ID,
+ "content": content,
+ })
+
+ event, context = yield self.event_creation_handler.create_new_client_event(
+ builder
+ )
+ yield self.hs.get_datastore().persist_event(event, context)
+ defer.returnValue(event)
+
+ @defer.inlineCallbacks
+ def inject_room_member(self, user_id, membership="join", extra_content={}):
+ content = {"membership": membership}
+ content.update(extra_content)
+ builder = self.event_builder_factory.new({
+ "type": "m.room.member",
+ "sender": user_id,
+ "state_key": user_id,
+ "room_id": TEST_ROOM_ID,
+ "content": content,
+ })
+
+ event, context = yield self.event_creation_handler.create_new_client_event(
+ builder
+ )
+
+ yield self.hs.get_datastore().persist_event(event, context)
+ defer.returnValue(event)
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