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-rw-r--r--tests/push/test_presentable_names.py229
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diff --git a/tests/push/test_presentable_names.py b/tests/push/test_presentable_names.py
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+#  Copyright 2021 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 typing import Iterable, Optional, Tuple
+
+from synapse.api.constants import EventTypes, Membership
+from synapse.api.room_versions import RoomVersions
+from synapse.events import FrozenEvent
+from synapse.push.presentable_names import calculate_room_name
+from synapse.types import StateKey, StateMap
+
+from tests import unittest
+
+
+class MockDataStore:
+    """
+    A fake data store which stores a mapping of state key to event content.
+    (I.e. the state key is used as the event ID.)
+    """
+
+    def __init__(self, events: Iterable[Tuple[StateKey, dict]]):
+        """
+        Args:
+            events: A state map to event contents.
+        """
+        self._events = {}
+
+        for i, (event_id, content) in enumerate(events):
+            self._events[event_id] = FrozenEvent(
+                {
+                    "event_id": "$event_id",
+                    "type": event_id[0],
+                    "sender": "@user:test",
+                    "state_key": event_id[1],
+                    "room_id": "#room:test",
+                    "content": content,
+                    "origin_server_ts": i,
+                },
+                RoomVersions.V1,
+            )
+
+    async def get_event(
+        self, event_id: StateKey, allow_none: bool = False
+    ) -> Optional[FrozenEvent]:
+        assert allow_none, "Mock not configured for allow_none = False"
+
+        return self._events.get(event_id)
+
+    async def get_events(self, event_ids: Iterable[StateKey]):
+        # This is cheating since it just returns all events.
+        return self._events
+
+
+class PresentableNamesTestCase(unittest.HomeserverTestCase):
+    USER_ID = "@test:test"
+    OTHER_USER_ID = "@user:test"
+
+    def _calculate_room_name(
+        self,
+        events: StateMap[dict],
+        user_id: str = "",
+        fallback_to_members: bool = True,
+        fallback_to_single_member: bool = True,
+    ):
+        # This isn't 100% accurate, but works with MockDataStore.
+        room_state_ids = {k[0]: k[0] for k in events}
+
+        return self.get_success(
+            calculate_room_name(
+                MockDataStore(events),
+                room_state_ids,
+                user_id or self.USER_ID,
+                fallback_to_members,
+                fallback_to_single_member,
+            )
+        )
+
+    def test_name(self):
+        """A room name event should be used."""
+        events = [
+            ((EventTypes.Name, ""), {"name": "test-name"}),
+        ]
+        self.assertEqual("test-name", self._calculate_room_name(events))
+
+        # Check if the event content has garbage.
+        events = [((EventTypes.Name, ""), {"foo": 1})]
+        self.assertEqual("Empty Room", self._calculate_room_name(events))
+
+        events = [((EventTypes.Name, ""), {"name": 1})]
+        self.assertEqual(1, self._calculate_room_name(events))
+
+    def test_canonical_alias(self):
+        """An canonical alias should be used."""
+        events = [
+            ((EventTypes.CanonicalAlias, ""), {"alias": "#test-name:test"}),
+        ]
+        self.assertEqual("#test-name:test", self._calculate_room_name(events))
+
+        # Check if the event content has garbage.
+        events = [((EventTypes.CanonicalAlias, ""), {"foo": 1})]
+        self.assertEqual("Empty Room", self._calculate_room_name(events))
+
+        events = [((EventTypes.CanonicalAlias, ""), {"alias": "test-name"})]
+        self.assertEqual("Empty Room", self._calculate_room_name(events))
+
+    def test_invite(self):
+        """An invite has special behaviour."""
+        events = [
+            ((EventTypes.Member, self.USER_ID), {"membership": Membership.INVITE}),
+            ((EventTypes.Member, self.OTHER_USER_ID), {"displayname": "Other User"}),
+        ]
+        self.assertEqual("Invite from Other User", self._calculate_room_name(events))
+        self.assertIsNone(
+            self._calculate_room_name(events, fallback_to_single_member=False)
+        )
+        # Ensure this logic is skipped if we don't fallback to members.
+        self.assertIsNone(self._calculate_room_name(events, fallback_to_members=False))
+
+        # Check if the event content has garbage.
+        events = [
+            ((EventTypes.Member, self.USER_ID), {"membership": Membership.INVITE}),
+            ((EventTypes.Member, self.OTHER_USER_ID), {"foo": 1}),
+        ]
+        self.assertEqual("Invite from @user:test", self._calculate_room_name(events))
+
+        # No member event for sender.
+        events = [
+            ((EventTypes.Member, self.USER_ID), {"membership": Membership.INVITE}),
+        ]
+        self.assertEqual("Room Invite", self._calculate_room_name(events))
+
+    def test_no_members(self):
+        """Behaviour of an empty room."""
+        events = []
+        self.assertEqual("Empty Room", self._calculate_room_name(events))
+
+        # Note that events with invalid (or missing) membership are ignored.
+        events = [
+            ((EventTypes.Member, self.OTHER_USER_ID), {"foo": 1}),
+            ((EventTypes.Member, "@foo:test"), {"membership": "foo"}),
+        ]
+        self.assertEqual("Empty Room", self._calculate_room_name(events))
+
+    def test_no_other_members(self):
+        """Behaviour of a room with no other members in it."""
+        events = [
+            (
+                (EventTypes.Member, self.USER_ID),
+                {"membership": Membership.JOIN, "displayname": "Me"},
+            ),
+        ]
+        self.assertEqual("Me", self._calculate_room_name(events))
+
+        # Check if the event content has no displayname.
+        events = [
+            ((EventTypes.Member, self.USER_ID), {"membership": Membership.JOIN}),
+        ]
+        self.assertEqual("@test:test", self._calculate_room_name(events))
+
+        # 3pid invite, use the other user (who is set as the sender).
+        events = [
+            ((EventTypes.Member, self.OTHER_USER_ID), {"membership": Membership.JOIN}),
+        ]
+        self.assertEqual(
+            "nobody", self._calculate_room_name(events, user_id=self.OTHER_USER_ID)
+        )
+
+        events = [
+            ((EventTypes.Member, self.OTHER_USER_ID), {"membership": Membership.JOIN}),
+            ((EventTypes.ThirdPartyInvite, self.OTHER_USER_ID), {}),
+        ]
+        self.assertEqual(
+            "Inviting email address",
+            self._calculate_room_name(events, user_id=self.OTHER_USER_ID),
+        )
+
+    def test_one_other_member(self):
+        """Behaviour of a room with a single other member."""
+        events = [
+            ((EventTypes.Member, self.USER_ID), {"membership": Membership.JOIN}),
+            (
+                (EventTypes.Member, self.OTHER_USER_ID),
+                {"membership": Membership.JOIN, "displayname": "Other User"},
+            ),
+        ]
+        self.assertEqual("Other User", self._calculate_room_name(events))
+        self.assertIsNone(
+            self._calculate_room_name(events, fallback_to_single_member=False)
+        )
+
+        # Check if the event content has no displayname and is an invite.
+        events = [
+            ((EventTypes.Member, self.USER_ID), {"membership": Membership.JOIN}),
+            (
+                (EventTypes.Member, self.OTHER_USER_ID),
+                {"membership": Membership.INVITE},
+            ),
+        ]
+        self.assertEqual("@user:test", self._calculate_room_name(events))
+
+    def test_other_members(self):
+        """Behaviour of a room with multiple other members."""
+        # Two other members.
+        events = [
+            ((EventTypes.Member, self.USER_ID), {"membership": Membership.JOIN}),
+            (
+                (EventTypes.Member, self.OTHER_USER_ID),
+                {"membership": Membership.JOIN, "displayname": "Other User"},
+            ),
+            ((EventTypes.Member, "@foo:test"), {"membership": Membership.JOIN}),
+        ]
+        self.assertEqual("Other User and @foo:test", self._calculate_room_name(events))
+
+        # Three or more other members.
+        events.append(
+            ((EventTypes.Member, "@fourth:test"), {"membership": Membership.INVITE})
+        )
+        self.assertEqual("Other User and 2 others", self._calculate_room_name(events))