diff --git a/tests/events/test_snapshot.py b/tests/events/test_snapshot.py
new file mode 100644
index 0000000000..640f5f3bce
--- /dev/null
+++ b/tests/events/test_snapshot.py
@@ -0,0 +1,100 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# 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 synapse.events.snapshot import EventContext
+from synapse.rest import admin
+from synapse.rest.client.v1 import login, room
+
+from tests import unittest
+from tests.test_utils.event_injection import create_event
+
+
+class TestEventContext(unittest.HomeserverTestCase):
+ servlets = [
+ admin.register_servlets,
+ login.register_servlets,
+ room.register_servlets,
+ ]
+
+ def prepare(self, reactor, clock, hs):
+ self.store = hs.get_datastore()
+ self.storage = hs.get_storage()
+
+ self.user_id = self.register_user("u1", "pass")
+ self.user_tok = self.login("u1", "pass")
+ self.room_id = self.helper.create_room_as(tok=self.user_tok)
+
+ def test_serialize_deserialize_msg(self):
+ """Test that an EventContext for a message event is the same after
+ serialize/deserialize.
+ """
+
+ event, context = create_event(
+ self.hs, room_id=self.room_id, type="m.test", sender=self.user_id,
+ )
+
+ self._check_serialize_deserialize(event, context)
+
+ def test_serialize_deserialize_state_no_prev(self):
+ """Test that an EventContext for a state event (with not previous entry)
+ is the same after serialize/deserialize.
+ """
+ event, context = create_event(
+ self.hs,
+ room_id=self.room_id,
+ type="m.test",
+ sender=self.user_id,
+ state_key="",
+ )
+
+ self._check_serialize_deserialize(event, context)
+
+ def test_serialize_deserialize_state_prev(self):
+ """Test that an EventContext for a state event (which replaces a
+ previous entry) is the same after serialize/deserialize.
+ """
+ event, context = create_event(
+ self.hs,
+ room_id=self.room_id,
+ type="m.room.member",
+ sender=self.user_id,
+ state_key=self.user_id,
+ content={"membership": "leave"},
+ )
+
+ self._check_serialize_deserialize(event, context)
+
+ def _check_serialize_deserialize(self, event, context):
+ serialized = self.get_success(context.serialize(event, self.store))
+
+ d_context = EventContext.deserialize(self.storage, serialized)
+
+ self.assertEqual(context.state_group, d_context.state_group)
+ self.assertEqual(context.rejected, d_context.rejected)
+ self.assertEqual(
+ context.state_group_before_event, d_context.state_group_before_event
+ )
+ self.assertEqual(context.prev_group, d_context.prev_group)
+ self.assertEqual(context.delta_ids, d_context.delta_ids)
+ self.assertEqual(context.app_service, d_context.app_service)
+
+ self.assertEqual(
+ self.get_success(context.get_current_state_ids()),
+ self.get_success(d_context.get_current_state_ids()),
+ )
+ self.assertEqual(
+ self.get_success(context.get_prev_state_ids()),
+ self.get_success(d_context.get_prev_state_ids()),
+ )
diff --git a/tests/test_utils/event_injection.py b/tests/test_utils/event_injection.py
index 8f6872761a..431e9f8e5e 100644
--- a/tests/test_utils/event_injection.py
+++ b/tests/test_utils/event_injection.py
@@ -14,12 +14,13 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from typing import Optional
+from typing import Optional, Tuple
import synapse.server
from synapse.api.constants import EventTypes
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.events import EventBase
+from synapse.events.snapshot import EventContext
from synapse.types import Collection
from tests.test_utils import get_awaitable_result
@@ -75,6 +76,23 @@ def inject_event(
"""
test_reactor = hs.get_reactor()
+ event, context = create_event(hs, room_version, prev_event_ids, **kwargs)
+
+ d = hs.get_storage().persistence.persist_event(event, context)
+ test_reactor.advance(0)
+ get_awaitable_result(d)
+
+ return event
+
+
+def create_event(
+ hs: synapse.server.HomeServer,
+ room_version: Optional[str] = None,
+ prev_event_ids: Optional[Collection[str]] = None,
+ **kwargs
+) -> Tuple[EventBase, EventContext]:
+ test_reactor = hs.get_reactor()
+
if room_version is None:
d = hs.get_datastore().get_room_version_id(kwargs["room_id"])
test_reactor.advance(0)
@@ -89,8 +107,4 @@ def inject_event(
test_reactor.advance(0)
event, context = get_awaitable_result(d)
- d = hs.get_storage().persistence.persist_event(event, context)
- test_reactor.advance(0)
- get_awaitable_result(d)
-
- return event
+ return event, context
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