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synapse/tests/test_state.py
Erik Johnston 23740eaa3d
Correctly mention previous copyright ()
During the migration the automated script to update the copyright
headers accidentally got rid of some of the existing copyright lines.
Reinstate them.
2024-01-23 11:26:48 +00:00

897 lines
30 KiB
Python

#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2014-2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
from typing import (
Any,
Collection,
Dict,
Generator,
Iterable,
Iterator,
List,
Optional,
Set,
Tuple,
cast,
)
from unittest.mock import Mock
from twisted.internet import defer
from synapse.api.auth.internal import InternalAuth
from synapse.api.constants import EventTypes, Membership
from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase, make_event_from_dict
from synapse.events.snapshot import EventContext
from synapse.state import StateHandler, StateResolutionHandler, _make_state_cache_entry
from synapse.types import MutableStateMap, StateMap
from synapse.types.state import StateFilter
from synapse.util import Clock
from synapse.util.macaroons import MacaroonGenerator
from tests import unittest
from .utils import MockClock, default_config
_next_event_id = 1000
def create_event(
name: Optional[str] = None,
type: Optional[str] = None,
state_key: Optional[str] = None,
depth: int = 2,
event_id: Optional[str] = None,
prev_events: Optional[List[Tuple[str, dict]]] = None,
**kwargs: Any,
) -> EventBase:
global _next_event_id
if not event_id:
_next_event_id += 1
event_id = "$%s:test" % (_next_event_id,)
if not name:
if state_key is not None:
name = "<%s-%s, %s>" % (type, state_key, event_id)
else:
name = "<%s, %s>" % (type, event_id)
d = {
"event_id": event_id,
"type": type,
"sender": "@user_id:example.com",
"room_id": "!room_id:example.com",
"depth": depth,
"prev_events": prev_events or [],
}
if state_key is not None:
d["state_key"] = state_key
d.update(kwargs)
return make_event_from_dict(d)
class _DummyStore:
def __init__(self) -> None:
self._event_to_state_group: Dict[str, int] = {}
self._group_to_state: Dict[int, MutableStateMap[str]] = {}
self._event_id_to_event: Dict[str, EventBase] = {}
self._next_group = 1
async def get_state_groups_ids(
self, room_id: str, event_ids: Collection[str]
) -> Dict[int, MutableStateMap[str]]:
groups = {}
for event_id in event_ids:
group = self._event_to_state_group.get(event_id)
if group:
groups[group] = self._group_to_state[group]
return groups
async def get_state_ids_for_group(
self, state_group: int, state_filter: Optional[StateFilter] = None
) -> MutableStateMap[str]:
return self._group_to_state[state_group]
async def store_state_group(
self,
event_id: str,
room_id: str,
prev_group: Optional[int],
delta_ids: Optional[StateMap[str]],
current_state_ids: Optional[StateMap[str]],
) -> int:
state_group = self._next_group
self._next_group += 1
if current_state_ids is None:
assert prev_group is not None
assert delta_ids is not None
current_state_ids = dict(self._group_to_state[prev_group])
current_state_ids.update(delta_ids)
self._group_to_state[state_group] = dict(current_state_ids)
return state_group
async def get_events(
self, event_ids: Collection[str], **kwargs: Any
) -> Dict[str, EventBase]:
return {
e_id: self._event_id_to_event[e_id]
for e_id in event_ids
if e_id in self._event_id_to_event
}
async def get_partial_state_events(
self, event_ids: Collection[str]
) -> Dict[str, bool]:
return {e: False for e in event_ids}
async def get_state_group_delta(
self, name: str
) -> Tuple[Optional[int], Optional[StateMap[str]]]:
return None, None
def register_events(self, events: Iterable[EventBase]) -> None:
for e in events:
self._event_id_to_event[e.event_id] = e
def register_event_context(self, event: EventBase, context: EventContext) -> None:
assert context.state_group is not None
self._event_to_state_group[event.event_id] = context.state_group
def register_event_id_state_group(self, event_id: str, state_group: int) -> None:
self._event_to_state_group[event_id] = state_group
async def get_room_version_id(self, room_id: str) -> str:
return RoomVersions.V1.identifier
async def get_state_group_for_events(
self, event_ids: Collection[str], await_full_state: bool = True
) -> Dict[str, int]:
res = {}
for event in event_ids:
res[event] = self._event_to_state_group[event]
return res
async def get_state_for_groups(
self, groups: Collection[int]
) -> Dict[int, MutableStateMap[str]]:
res = {}
for group in groups:
state = self._group_to_state[group]
res[group] = state
return res
class DictObj(dict):
def __init__(self, **kwargs: Any) -> None:
super().__init__(kwargs)
self.__dict__ = self
class Graph:
def __init__(self, nodes: Dict[str, DictObj], edges: Dict[str, List[str]]):
events: Dict[str, EventBase] = {}
clobbered: Set[str] = set()
for event_id, fields in nodes.items():
refs = edges.get(event_id)
if refs:
clobbered.difference_update(refs)
prev_events: List[Tuple[str, dict]] = [(r, {}) for r in refs]
else:
prev_events = []
events[event_id] = create_event(
event_id=event_id, prev_events=prev_events, **fields
)
self._leaves = clobbered
self._events = sorted(events.values(), key=lambda e: e.depth)
def walk(self) -> Iterator[EventBase]:
return iter(self._events)
class StateTestCase(unittest.TestCase):
def setUp(self) -> None:
self.dummy_store = _DummyStore()
storage_controllers = Mock(main=self.dummy_store, state=self.dummy_store)
hs = Mock(
spec_set=[
"config",
"get_datastores",
"get_storage_controllers",
"get_auth",
"get_state_handler",
"get_clock",
"get_state_resolution_handler",
"get_account_validity_handler",
"get_macaroon_generator",
"get_instance_name",
"get_simple_http_client",
"get_replication_client",
"hostname",
]
)
clock = cast(Clock, MockClock())
hs.config = default_config("tesths", True)
hs.get_datastores.return_value = Mock(main=self.dummy_store)
hs.get_state_handler.return_value = None
hs.get_clock.return_value = clock
hs.get_macaroon_generator.return_value = MacaroonGenerator(
clock, "tesths", b"verysecret"
)
hs.get_auth.return_value = InternalAuth(hs)
hs.get_state_resolution_handler = lambda: StateResolutionHandler(hs)
hs.get_storage_controllers.return_value = storage_controllers
self.state = StateHandler(hs)
self.event_id = 0
@defer.inlineCallbacks
def test_branch_no_conflict(self) -> Generator[defer.Deferred, Any, None]:
graph = Graph(
nodes={
"START": DictObj(
type=EventTypes.Create, state_key="", content={}, depth=1
),
"A": DictObj(type=EventTypes.Message, depth=2),
"B": DictObj(type=EventTypes.Message, depth=3),
"C": DictObj(type=EventTypes.Name, state_key="", depth=3),
"D": DictObj(type=EventTypes.Message, depth=4),
},
edges={"A": ["START"], "B": ["A"], "C": ["A"], "D": ["B", "C"]},
)
self.dummy_store.register_events(graph.walk())
context_store: Dict[str, EventContext] = {}
for event in graph.walk():
context = yield defer.ensureDeferred(
self.state.compute_event_context(event)
)
self.dummy_store.register_event_context(event, context)
context_store[event.event_id] = context
ctx_c = context_store["C"]
ctx_d = context_store["D"]
prev_state_ids: StateMap[str]
prev_state_ids = yield defer.ensureDeferred(ctx_d.get_prev_state_ids())
self.assertEqual(2, len(prev_state_ids))
self.assertEqual(ctx_c.state_group, ctx_d.state_group_before_event)
self.assertEqual(ctx_d.state_group_before_event, ctx_d.state_group)
@defer.inlineCallbacks
def test_branch_basic_conflict(
self,
) -> Generator["defer.Deferred[object]", Any, None]:
graph = Graph(
nodes={
"START": DictObj(
type=EventTypes.Create,
state_key="",
content={"creator": "@user_id:example.com"},
depth=1,
),
"A": DictObj(
type=EventTypes.Member,
state_key="@user_id:example.com",
content={"membership": Membership.JOIN},
membership=Membership.JOIN,
depth=2,
),
"B": DictObj(type=EventTypes.Name, state_key="", depth=3),
"C": DictObj(type=EventTypes.Name, state_key="", depth=4),
"D": DictObj(type=EventTypes.Message, depth=5),
},
edges={"A": ["START"], "B": ["A"], "C": ["A"], "D": ["B", "C"]},
)
self.dummy_store.register_events(graph.walk())
context_store: Dict[str, EventContext] = {}
for event in graph.walk():
context = yield defer.ensureDeferred(
self.state.compute_event_context(event)
)
self.dummy_store.register_event_context(event, context)
context_store[event.event_id] = context
# C ends up winning the resolution between B and C
ctx_c = context_store["C"]
ctx_d = context_store["D"]
prev_state_ids: StateMap[str]
prev_state_ids = yield defer.ensureDeferred(ctx_d.get_prev_state_ids())
self.assertSetEqual({"START", "A", "C"}, set(prev_state_ids.values()))
self.assertEqual(ctx_c.state_group, ctx_d.state_group_before_event)
self.assertEqual(ctx_d.state_group_before_event, ctx_d.state_group)
@defer.inlineCallbacks
def test_branch_have_banned_conflict(
self,
) -> Generator["defer.Deferred[object]", Any, None]:
graph = Graph(
nodes={
"START": DictObj(
type=EventTypes.Create,
state_key="",
content={"creator": "@user_id:example.com"},
depth=1,
),
"A": DictObj(
type=EventTypes.Member,
state_key="@user_id:example.com",
content={"membership": Membership.JOIN},
membership=Membership.JOIN,
depth=2,
),
"B": DictObj(type=EventTypes.Name, state_key="", depth=3),
"C": DictObj(
type=EventTypes.Member,
state_key="@user_id_2:example.com",
content={"membership": Membership.BAN},
membership=Membership.BAN,
depth=4,
),
"D": DictObj(
type=EventTypes.Name,
state_key="",
depth=4,
sender="@user_id_2:example.com",
),
"E": DictObj(type=EventTypes.Message, depth=5),
},
edges={"A": ["START"], "B": ["A"], "C": ["B"], "D": ["B"], "E": ["C", "D"]},
)
self.dummy_store.register_events(graph.walk())
context_store: Dict[str, EventContext] = {}
for event in graph.walk():
context = yield defer.ensureDeferred(
self.state.compute_event_context(event)
)
self.dummy_store.register_event_context(event, context)
context_store[event.event_id] = context
# C ends up winning the resolution between C and D because bans win over other
# changes
ctx_c = context_store["C"]
ctx_e = context_store["E"]
prev_state_ids: StateMap[str]
prev_state_ids = yield defer.ensureDeferred(ctx_e.get_prev_state_ids())
self.assertSetEqual({"START", "A", "B", "C"}, set(prev_state_ids.values()))
self.assertEqual(ctx_c.state_group, ctx_e.state_group_before_event)
self.assertEqual(ctx_e.state_group_before_event, ctx_e.state_group)
@defer.inlineCallbacks
def test_branch_have_perms_conflict(
self,
) -> Generator["defer.Deferred[object]", Any, None]:
userid1 = "@user_id:example.com"
userid2 = "@user_id2:example.com"
nodes = {
"A1": DictObj(
type=EventTypes.Create,
state_key="",
content={"creator": userid1},
depth=1,
),
"A2": DictObj(
type=EventTypes.Member,
state_key=userid1,
content={"membership": Membership.JOIN},
membership=Membership.JOIN,
),
"A3": DictObj(
type=EventTypes.Member,
state_key=userid2,
content={"membership": Membership.JOIN},
membership=Membership.JOIN,
),
"A4": DictObj(
type=EventTypes.PowerLevels,
state_key="",
content={
"events": {"m.room.name": 50},
"users": {userid1: 100, userid2: 60},
},
),
"A5": DictObj(type=EventTypes.Name, state_key=""),
"B": DictObj(
type=EventTypes.PowerLevels,
state_key="",
content={"events": {"m.room.name": 50}, "users": {userid2: 30}},
),
"C": DictObj(type=EventTypes.Name, state_key="", sender=userid2),
"D": DictObj(type=EventTypes.Message),
}
edges = {
"A2": ["A1"],
"A3": ["A2"],
"A4": ["A3"],
"A5": ["A4"],
"B": ["A5"],
"C": ["A5"],
"D": ["B", "C"],
}
self._add_depths(nodes, edges)
graph = Graph(nodes, edges)
self.dummy_store.register_events(graph.walk())
context_store: Dict[str, EventContext] = {}
for event in graph.walk():
context = yield defer.ensureDeferred(
self.state.compute_event_context(event)
)
self.dummy_store.register_event_context(event, context)
context_store[event.event_id] = context
# B ends up winning the resolution between B and C because power levels
# win over other changes.
ctx_b = context_store["B"]
ctx_d = context_store["D"]
prev_state_ids: StateMap[str]
prev_state_ids = yield defer.ensureDeferred(ctx_d.get_prev_state_ids())
self.assertSetEqual({"A1", "A2", "A3", "A5", "B"}, set(prev_state_ids.values()))
self.assertEqual(ctx_b.state_group, ctx_d.state_group_before_event)
self.assertEqual(ctx_d.state_group_before_event, ctx_d.state_group)
def _add_depths(
self, nodes: Dict[str, DictObj], edges: Dict[str, List[str]]
) -> None:
def _get_depth(ev: str) -> int:
node = nodes[ev]
if "depth" not in node:
prevs = edges[ev]
depth = max(_get_depth(prev) for prev in prevs) + 1
node["depth"] = depth
return node["depth"]
for n in nodes:
_get_depth(n)
@defer.inlineCallbacks
def test_annotate_with_old_message(
self,
) -> Generator["defer.Deferred[object]", Any, None]:
event = create_event(type="test_message", name="event")
old_state = [
create_event(type="test1", state_key="1"),
create_event(type="test1", state_key="2"),
create_event(type="test2", state_key=""),
]
context: EventContext
context = yield defer.ensureDeferred(
self.state.compute_event_context(
event,
state_ids_before_event={
(e.type, e.state_key): e.event_id for e in old_state
},
partial_state=False,
)
)
prev_state_ids: StateMap[str]
prev_state_ids = yield defer.ensureDeferred(context.get_prev_state_ids())
self.assertCountEqual((e.event_id for e in old_state), prev_state_ids.values())
current_state_ids: StateMap[str]
current_state_ids = yield defer.ensureDeferred(context.get_current_state_ids())
self.assertCountEqual(
(e.event_id for e in old_state), current_state_ids.values()
)
self.assertIsNotNone(context.state_group_before_event)
self.assertEqual(context.state_group_before_event, context.state_group)
@defer.inlineCallbacks
def test_annotate_with_old_state(
self,
) -> Generator["defer.Deferred[object]", Any, None]:
event = create_event(type="state", state_key="", name="event")
old_state = [
create_event(type="test1", state_key="1"),
create_event(type="test1", state_key="2"),
create_event(type="test2", state_key=""),
]
context: EventContext
context = yield defer.ensureDeferred(
self.state.compute_event_context(
event,
state_ids_before_event={
(e.type, e.state_key): e.event_id for e in old_state
},
partial_state=False,
)
)
prev_state_ids: StateMap[str]
prev_state_ids = yield defer.ensureDeferred(context.get_prev_state_ids())
self.assertCountEqual((e.event_id for e in old_state), prev_state_ids.values())
current_state_ids: StateMap[str]
current_state_ids = yield defer.ensureDeferred(context.get_current_state_ids())
self.assertCountEqual(
(e.event_id for e in old_state + [event]), current_state_ids.values()
)
assert context.state_group_before_event is not None
assert context.state_group is not None
self.assertEqual(
context.state_group_deltas.get(
(context.state_group_before_event, context.state_group)
),
{(event.type, event.state_key): event.event_id},
)
self.assertNotEqual(context.state_group_before_event, context.state_group)
@defer.inlineCallbacks
def test_trivial_annotate_message(
self,
) -> Generator["defer.Deferred[object]", Any, None]:
prev_event_id = "prev_event_id"
event = create_event(
type="test_message", name="event2", prev_events=[(prev_event_id, {})]
)
old_state = [
create_event(type="test1", state_key="1"),
create_event(type="test1", state_key="2"),
create_event(type="test2", state_key=""),
]
group_name = yield defer.ensureDeferred(
self.dummy_store.store_state_group(
prev_event_id,
event.room_id,
None,
None,
{(e.type, e.state_key): e.event_id for e in old_state},
)
)
self.dummy_store.register_event_id_state_group(prev_event_id, group_name)
context: EventContext
context = yield defer.ensureDeferred(self.state.compute_event_context(event))
current_state_ids: StateMap[str]
current_state_ids = yield defer.ensureDeferred(context.get_current_state_ids())
self.assertEqual(
{e.event_id for e in old_state}, set(current_state_ids.values())
)
self.assertEqual(group_name, context.state_group)
@defer.inlineCallbacks
def test_trivial_annotate_state(
self,
) -> Generator["defer.Deferred[object]", Any, None]:
prev_event_id = "prev_event_id"
event = create_event(
type="state", state_key="", name="event2", prev_events=[(prev_event_id, {})]
)
old_state = [
create_event(type="test1", state_key="1"),
create_event(type="test1", state_key="2"),
create_event(type="test2", state_key=""),
]
group_name = yield defer.ensureDeferred(
self.dummy_store.store_state_group(
prev_event_id,
event.room_id,
None,
None,
{(e.type, e.state_key): e.event_id for e in old_state},
)
)
self.dummy_store.register_event_id_state_group(prev_event_id, group_name)
context: EventContext
context = yield defer.ensureDeferred(self.state.compute_event_context(event))
prev_state_ids: StateMap[str]
prev_state_ids = yield defer.ensureDeferred(context.get_prev_state_ids())
self.assertEqual({e.event_id for e in old_state}, set(prev_state_ids.values()))
self.assertIsNotNone(context.state_group)
@defer.inlineCallbacks
def test_resolve_message_conflict(
self,
) -> Generator["defer.Deferred[Any]", Any, None]:
prev_event_id1 = "event_id1"
prev_event_id2 = "event_id2"
event = create_event(
type="test_message",
name="event3",
prev_events=[(prev_event_id1, {}), (prev_event_id2, {})],
)
creation = create_event(type=EventTypes.Create, state_key="")
old_state_1 = [
creation,
create_event(type="test1", state_key="1"),
create_event(type="test1", state_key="2"),
create_event(type="test2", state_key=""),
]
old_state_2 = [
creation,
create_event(type="test1", state_key="1"),
create_event(type="test3", state_key="2"),
create_event(type="test4", state_key=""),
]
self.dummy_store.register_events(old_state_1)
self.dummy_store.register_events(old_state_2)
context: EventContext
context = yield self._get_context(
event, prev_event_id1, old_state_1, prev_event_id2, old_state_2
)
current_state_ids: StateMap[str]
current_state_ids = yield defer.ensureDeferred(context.get_current_state_ids())
self.assertEqual(len(current_state_ids), 6)
self.assertIsNotNone(context.state_group)
@defer.inlineCallbacks
def test_resolve_state_conflict(
self,
) -> Generator["defer.Deferred[Any]", Any, None]:
prev_event_id1 = "event_id1"
prev_event_id2 = "event_id2"
event = create_event(
type="test4",
state_key="",
name="event",
prev_events=[(prev_event_id1, {}), (prev_event_id2, {})],
)
creation = create_event(type=EventTypes.Create, state_key="")
old_state_1 = [
creation,
create_event(type="test1", state_key="1"),
create_event(type="test1", state_key="2"),
create_event(type="test2", state_key=""),
]
old_state_2 = [
creation,
create_event(type="test1", state_key="1"),
create_event(type="test3", state_key="2"),
create_event(type="test4", state_key=""),
]
store = _DummyStore()
store.register_events(old_state_1)
store.register_events(old_state_2)
self.dummy_store.get_events = store.get_events # type: ignore[method-assign]
context: EventContext
context = yield self._get_context(
event, prev_event_id1, old_state_1, prev_event_id2, old_state_2
)
current_state_ids: StateMap[str]
current_state_ids = yield defer.ensureDeferred(context.get_current_state_ids())
self.assertEqual(len(current_state_ids), 6)
self.assertIsNotNone(context.state_group)
@defer.inlineCallbacks
def test_standard_depth_conflict(
self,
) -> Generator["defer.Deferred[Any]", Any, None]:
prev_event_id1 = "event_id1"
prev_event_id2 = "event_id2"
event = create_event(
type="test4",
name="event",
prev_events=[(prev_event_id1, {}), (prev_event_id2, {})],
)
member_event = create_event(
type=EventTypes.Member,
state_key="@user_id:example.com",
content={"membership": Membership.JOIN},
)
power_levels = create_event(
type=EventTypes.PowerLevels,
state_key="",
content={"users": {"@foo:bar": "100", "@user_id:example.com": "100"}},
)
creation = create_event(
type=EventTypes.Create, state_key="", content={"creator": "@foo:bar"}
)
old_state_1 = [
creation,
power_levels,
member_event,
create_event(type="test1", state_key="1", depth=1),
]
old_state_2 = [
creation,
power_levels,
member_event,
create_event(type="test1", state_key="1", depth=2),
]
store = _DummyStore()
store.register_events(old_state_1)
store.register_events(old_state_2)
self.dummy_store.get_events = store.get_events # type: ignore[method-assign]
context: EventContext
context = yield self._get_context(
event, prev_event_id1, old_state_1, prev_event_id2, old_state_2
)
current_state_ids: StateMap[str]
current_state_ids = yield defer.ensureDeferred(context.get_current_state_ids())
self.assertEqual(old_state_2[3].event_id, current_state_ids[("test1", "1")])
# Reverse the depth to make sure we are actually using the depths
# during state resolution.
old_state_1 = [
creation,
power_levels,
member_event,
create_event(type="test1", state_key="1", depth=2),
]
old_state_2 = [
creation,
power_levels,
member_event,
create_event(type="test1", state_key="1", depth=1),
]
store.register_events(old_state_1)
store.register_events(old_state_2)
context = yield self._get_context(
event, prev_event_id1, old_state_1, prev_event_id2, old_state_2
)
current_state_ids = yield defer.ensureDeferred(context.get_current_state_ids())
self.assertEqual(old_state_1[3].event_id, current_state_ids[("test1", "1")])
@defer.inlineCallbacks
def _get_context(
self,
event: EventBase,
prev_event_id_1: str,
old_state_1: Collection[EventBase],
prev_event_id_2: str,
old_state_2: Collection[EventBase],
) -> Generator["defer.Deferred[object]", Any, EventContext]:
sg1: int
sg1 = yield defer.ensureDeferred(
self.dummy_store.store_state_group(
prev_event_id_1,
event.room_id,
None,
None,
{(e.type, e.state_key): e.event_id for e in old_state_1},
)
)
self.dummy_store.register_event_id_state_group(prev_event_id_1, sg1)
sg2: int
sg2 = yield defer.ensureDeferred(
self.dummy_store.store_state_group(
prev_event_id_2,
event.room_id,
None,
None,
{(e.type, e.state_key): e.event_id for e in old_state_2},
)
)
self.dummy_store.register_event_id_state_group(prev_event_id_2, sg2)
result = yield defer.ensureDeferred(self.state.compute_event_context(event))
return result
def test_make_state_cache_entry(self) -> None:
"Test that calculating a prev_group and delta is correct"
new_state = {
("a", ""): "E",
("b", ""): "E",
("c", ""): "E",
("d", ""): "E",
}
# old_state_1 has fewer differences to new_state than old_state_2, but
# the delta involves deleting a key, which isn't allowed in the deltas,
# so we should pick old_state_2 as the prev_group.
# `old_state_1` has two differences: `a` and `e`
old_state_1 = {
("a", ""): "F",
("b", ""): "E",
("c", ""): "E",
("d", ""): "E",
("e", ""): "E",
}
# `old_state_2` has three differences: `a`, `c` and `d`
old_state_2 = {
("a", ""): "F",
("b", ""): "E",
("c", ""): "F",
("d", ""): "F",
}
entry = _make_state_cache_entry(new_state, {1: old_state_1, 2: old_state_2})
self.assertEqual(entry.prev_group, 2)
# There are three changes from `old_state_2` to `new_state`
self.assertEqual(
entry.delta_ids, {("a", ""): "E", ("c", ""): "E", ("d", ""): "E"}
)