litellm/tests/integration/management/test_scim_group_pathless_patch.py
devin-ai-integration[bot] 7efce7f8e0
test(integration): give chaos and timing tests a harness API and gate raw signals (#46031)
* test(integration): give chaos and timing tests a harness API and gate raw signals

Chaos tests killed and suspended proxy workers with raw os.kill and psutil
calls and bounded elapsed time with fixed literals, so they raced the uvicorn
worker healthcheck and failed on slow CI boxes

OwnedProxy now offers kill_worker and replacing_worker, which return only once
a replacement answers readiness with its own pid, and suspended, which is
refused unless the proxy was launched with a lenient worker healthcheck.
timing.py bounds durations against a measured control or the injected delay.
run.py measures the proxy import time once and derives readiness deadlines and
the per-test timeout from it, writing boot-calibration.json

check_test_quality.py adds TQ010 (raw process signals) and TQ011 (elapsed time
asserted under a numeric literal) for tests/integration outside _support, and
every call site is migrated so both report zero with no suppressions

* test(integration): steer the assistants wire burst onto both workers

The mixed-status burst assumed the OS would spread 48 connections across both workers and failed when one worker took them all. Each half is now sent while the other worker is suspended, and the test asserts an exact 24 and 24 split

* test(integration): restore product-enforced timing bounds lost in the migration

Some TQ011 migrations dropped or loosened a bound whose time is the behaviour
under test. The websocket session cap only kept its floor, so a cap closing at
300 s would have passed, and several timeouts were bounded by the injected stall
instead of the configured product value

assert_enforced_within bounds an elapsed time by the configured value plus
explicit slack, with an optional floor. The websocket cap, the MCP validation
timeout, the guardrail litellm_params timeout, the prisma command timeouts, the
baseline projection lock timeout and the key metadata statement timeout use it.
The device code refusal keeps its 15 s margin, and the langfuse retried prompt
fetch is now bounded by a cold fetch of a steady prompt as well as by the
ignored retry-after

* fix(tests): wait for the supervisor to reap killed workers and fix real-kill migrations

The lenient worker healthcheck was the whole case budget, so uvicorn's supervisor sat
in a ping on the killed worker for up to that long before respawning it. It now uses
the graceful stop budget, and a worker kill returns only after the victim is reaped,
so pooled connections no longer race the dead worker's socket.

Several tests on main picked the multiprocessing resource tracker as their victim and
never killed a worker. Now that they kill a real one, presidio counts streams cut by
the death, delete_model waits for the config reload that removes a deleted model from
a replacement worker, and the wedged coordination Redis test kills before the wedge
and waits for every parked publish to fail before resuming Redis.

The redis cluster test imports the harness through the tests package so it collects
in the unit job, and the per-model fallback rig exposes the owned proxy it now needs.

* test(observability): only require S3 deliveries the killed worker could not have buffered

A real SIGKILL drops the victim's unflushed batch, so requests it already answered can't be expected to land. The test now requires every request served after the replacement to land, some of the surviving worker's burst share to land, and nothing unsent to land

---------

Co-authored-by: Yuneng Jiang <yuneng@berri.ai>
2026-10-12 05:27:33 -07:00

542 lines
24 KiB
Python

import threading
import uuid
from collections.abc import Callable, Mapping, Sequence
from concurrent.futures import ThreadPoolExecutor
from dataclasses import dataclass
from itertools import chain
from pathlib import Path
from types import MappingProxyType
from typing import Final
import httpx
import pytest
from integration._support.client import Gateway, Scenario, eventually, object_value, string_value
from integration._support.process import owned_proxy_process
from integration.authorization._guardrail_opt_out import upstream_hits
from pydantic import JsonValue
PATCH_OP_SCHEMA: Final = "urn:ietf:params:scim:api:messages:2.0:PatchOp"
GROUP_SCHEMA: Final = "urn:ietf:params:scim:schemas:core:2.0:Group"
BURST_TEAMS: Final = 10
BURST_REQUESTS_PER_TEAM: Final = 3
KILL_AFTER_RESPONSES: Final = 5
def patch_group(
candidate: Gateway, team: str, operations: Sequence[JsonValue], *, key: str | None = None
) -> httpx.Response:
return candidate.request(
"PATCH",
f"/scim/v2/Groups/{team}",
{"schemas": [PATCH_OP_SCHEMA], "Operations": list(operations)},
key=key,
)
def pathless(op: str, value: JsonValue) -> dict[str, JsonValue]:
return {"op": op, "value": value}
def pathed(op: str, path: str, value: JsonValue | None = None) -> dict[str, JsonValue]:
return {"op": op, "path": path, **({} if value is None else {"value": value})}
def team_info(candidate: Gateway, team: str) -> dict[str, JsonValue]:
return object_value(candidate.get("/team/info", {"team_id": team})["team_info"])
def team_metadata(candidate: Gateway, team: str) -> dict[str, JsonValue]:
return object_value(team_info(candidate, team).get("metadata") or {})
def team_alias(candidate: Gateway, team: str) -> JsonValue:
return team_info(candidate, team).get("team_alias")
def alias_and_metadata(candidate: Gateway, team: str) -> tuple[JsonValue, dict[str, JsonValue]]:
info: Final = team_info(candidate, team)
return info.get("team_alias"), object_value(info.get("metadata") or {})
def member_ids(candidate: Gateway, team: str) -> frozenset[str]:
members: Final = team_info(candidate, team).get("members_with_roles") or []
assert isinstance(members, list), members
return frozenset(string_value(object_value(member)["user_id"]) for member in members)
def group_member_ids(candidate: Gateway, team: str) -> frozenset[str]:
members: Final = candidate.get(f"/scim/v2/Groups/{team}").get("members") or []
assert isinstance(members, list), members
return frozenset(string_value(object_value(member)["value"]) for member in members)
def scim_data(metadata: Mapping[str, JsonValue]) -> dict[str, JsonValue]:
return object_value(metadata["scim_data"])
def scim_group(scenario: Scenario, members: Sequence[str]) -> str:
created: Final = scenario.gateway.request(
"POST",
"/scim/v2/Groups",
{
"schemas": [GROUP_SCHEMA],
"displayName": f"integration-{uuid.uuid4().hex}",
"members": [{"value": member} for member in members],
},
)
assert created.status_code == 201, created.text
team: Final = string_value(object_value(created.json())["id"])
scenario.cleanups.callback(scenario.delete_team, team)
return team
def model_names(candidate: Gateway) -> frozenset[str]:
entries: Final = candidate.get("/model/info")["data"]
assert isinstance(entries, list), entries
return frozenset(string_value(object_value(entry)["model_name"]) for entry in entries)
def test_pathless_replace_renames_the_team_and_keeps_the_resource_under_scim_data(gateway: Gateway) -> None:
renamed: Final = f"okta-renamed-{uuid.uuid4().hex}"
external: Final = f"ext-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
team: Final = scenario.team()
response: Final = patch_group(
gateway, team, [pathless("replace", {"id": team, "displayName": renamed, "externalId": external})]
)
assert response.status_code == 200, response.text
assert response.json()["displayName"] == renamed, response.text
assert team_alias(gateway, team) == renamed
metadata: Final = team_metadata(gateway, team)
assert set(metadata) == {"externalId", "scim_data", "scim_managed"}, metadata
assert metadata["externalId"] == external and metadata["scim_managed"] is True, metadata
assert scim_data(metadata) == {"id": team, "displayName": renamed, "externalId": external}, metadata
def test_pathless_replace_with_members_is_an_absolute_roster(gateway: Gateway) -> None:
renamed: Final = f"roster-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
first: Final = scenario.user(user_role="internal_user")
second: Final = scenario.user(user_role="internal_user")
team: Final = scim_group(scenario, [first])
assert member_ids(gateway, team) == {first}
response: Final = patch_group(
gateway, team, [pathless("replace", {"displayName": renamed, "members": [{"value": second}]})]
)
assert response.status_code == 200, response.text
assert member_ids(gateway, team) == {second}
assert group_member_ids(gateway, team) == {second}
assert team_alias(gateway, team) == renamed
metadata: Final = team_metadata(gateway, team)
assert "" not in metadata, metadata
assert "members" not in scim_data(metadata), metadata
def test_pathless_add_applies_the_attribute(gateway: Gateway) -> None:
external: Final = f"ext-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
team: Final = scenario.team()
alias: Final = team_alias(gateway, team)
response: Final = patch_group(gateway, team, [pathless("add", {"externalId": external})])
assert response.status_code == 200, response.text
metadata: Final = team_metadata(gateway, team)
assert "" not in metadata, metadata
assert metadata["externalId"] == external, metadata
assert scim_data(metadata) == {"externalId": external}, metadata
assert team_alias(gateway, team) == alias
def test_pathed_operations_are_unchanged(gateway: Gateway) -> None:
renamed: Final = f"pathed-{uuid.uuid4().hex}"
external: Final = f"ext-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
first: Final = scenario.user(user_role="internal_user")
second: Final = scenario.user(user_role="internal_user")
team: Final = scim_group(scenario, [first])
response: Final = patch_group(
gateway,
team,
[
pathed("replace", "displayName", renamed),
pathed("replace", "externalId", external),
pathed("add", "members", [{"value": second}]),
pathed("remove", f'members[value eq "{first}"]'),
],
)
assert response.status_code == 200, response.text
assert response.json()["displayName"] == renamed, response.text
assert team_alias(gateway, team) == renamed
assert member_ids(gateway, team) == {second}
assert group_member_ids(gateway, team) == {second}
metadata: Final = team_metadata(gateway, team)
assert metadata["externalId"] == external, metadata
assert "" not in metadata, metadata
def test_pathless_patch_merges_into_the_put_snapshot(gateway: Gateway) -> None:
put_alias: Final = f"put-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
member: Final = scenario.user(user_role="internal_user")
team: Final = scim_group(scenario, [member])
put: Final = gateway.request(
"PUT",
f"/scim/v2/Groups/{team}",
{
"schemas": [GROUP_SCHEMA],
"id": team,
"displayName": put_alias,
"externalId": "ext-v1",
"members": [{"value": member}],
},
)
assert put.status_code == 200, put.text
assert scim_data(team_metadata(gateway, team))["externalId"] == "ext-v1"
response: Final = patch_group(gateway, team, [pathless("add", {"externalId": "ext-v2"})])
assert response.status_code == 200, response.text
metadata: Final = team_metadata(gateway, team)
snapshot: Final = scim_data(metadata)
assert "" not in metadata, metadata
assert metadata["externalId"] == "ext-v2", metadata
assert snapshot["displayName"] == put_alias and snapshot["externalId"] == "ext-v2", snapshot
assert team_alias(gateway, team) == put_alias
assert member_ids(gateway, team) == {member}
def test_group_patch_drops_the_empty_key_left_by_an_earlier_push(gateway: Gateway) -> None:
with gateway.scenario() as scenario:
team: Final = scenario.team()
gateway.post("/team/update", {"team_id": team, "metadata": {"": {"displayName": "stale"}, "env": "staging"}})
assert "" in team_metadata(gateway, team)
response: Final = patch_group(gateway, team, [pathed("replace", "externalId", "ext-after")])
assert response.status_code == 200, response.text
metadata: Final = team_metadata(gateway, team)
assert "" not in metadata, metadata
assert metadata["env"] == "staging" and metadata["externalId"] == "ext-after", metadata
def test_later_path_op_wins_over_the_pathless_value(gateway: Gateway) -> None:
first: Final = f"first-{uuid.uuid4().hex}"
second: Final = f"second-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
team: Final = scenario.team()
response: Final = patch_group(
gateway, team, [pathless("replace", {"displayName": first}), pathed("replace", "displayName", second)]
)
assert response.status_code == 200, response.text
assert response.json()["displayName"] == second, response.text
assert team_alias(gateway, team) == second
metadata: Final = team_metadata(gateway, team)
assert "" not in metadata, metadata
assert scim_data(metadata)["displayName"] == second, metadata
def test_read_only_attributes_do_not_become_metadata_keys(gateway: Gateway) -> None:
renamed: Final = f"readonly-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
team: Final = scenario.team()
response: Final = patch_group(
gateway,
team,
[
pathless(
"replace",
{
"id": team,
"schemas": [GROUP_SCHEMA],
"meta": {"resourceType": "Group"},
"displayName": renamed,
},
)
],
)
assert response.status_code == 200, response.text
metadata: Final = team_metadata(gateway, team)
assert set(metadata) == {"scim_data", "scim_managed"}, metadata
assert team_alias(gateway, team) == renamed
def test_pathless_rename_is_visible_from_the_peer_proxy(gateway: Gateway, peer: Gateway) -> None:
renamed: Final = f"peer-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
team: Final = scenario.team()
response: Final = patch_group(gateway, team, [pathless("replace", {"displayName": renamed})])
assert response.status_code == 200, response.text
group: Final = eventually(
lambda: peer.get(f"/scim/v2/Groups/{team}"), lambda observed: observed.get("displayName") == renamed
)
assert group["displayName"] == renamed, group
assert team_alias(peer, team) == renamed
assert "" not in team_metadata(peer, team)
def test_pathless_remove_is_rejected(gateway: Gateway) -> None:
with gateway.scenario() as scenario:
team: Final = scenario.team()
before: Final = alias_and_metadata(gateway, team)
response: Final = patch_group(gateway, team, [pathless("remove", {"externalId": "ext-gone"})])
assert response.status_code == 400, response.text
assert "RFC 7644 Section 3.5.2.2" in response.text, response.text
assert alias_and_metadata(gateway, team) == before
@pytest.mark.parametrize(
"operation",
[
{"op": "replace", "value": "new-name"},
{"op": "replace", "value": 7},
{"op": "replace", "value": ["new-name"]},
{"op": "replace", "value": ""},
{"op": "replace", "value": "x" * 5120},
{"op": "replace", "value": None},
{"op": "replace"},
{"op": "add", "value": "new-name"},
],
ids=["string", "int", "list", "empty-string", "5kb-string", "null", "missing", "add-string"],
)
def test_pathless_op_without_an_object_value_is_rejected(gateway: Gateway, operation: dict[str, JsonValue]) -> None:
with gateway.scenario() as scenario:
team: Final = scenario.team()
before: Final = alias_and_metadata(gateway, team)
response: Final = patch_group(gateway, team, [operation])
assert response.status_code == 400, response.text
assert "RFC 7644 Section 3.5.2" in response.text, response.text
assert alias_and_metadata(gateway, team) == before
def test_pathless_empty_object_changes_nothing_but_marks_the_team(gateway: Gateway) -> None:
with gateway.scenario() as scenario:
team: Final = scenario.team()
alias: Final = team_alias(gateway, team)
response: Final = patch_group(gateway, team, [pathless("replace", {})])
assert response.status_code == 200, response.text
assert team_alias(gateway, team) == alias
metadata: Final = team_metadata(gateway, team)
assert metadata == {"scim_managed": True, "scim_data": {}}, metadata
def test_duplicate_pathless_ops_are_idempotent(gateway: Gateway) -> None:
external: Final = f"ext-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
team: Final = scenario.team()
response: Final = patch_group(gateway, team, [pathless("add", {"externalId": external})] * 2)
assert response.status_code == 200, response.text
metadata: Final = team_metadata(gateway, team)
assert metadata == {"scim_managed": True, "externalId": external, "scim_data": {"externalId": external}}, (
metadata
)
def test_unauthenticated_patch_changes_nothing(gateway: Gateway) -> None:
with gateway.scenario() as scenario:
team: Final = scenario.team()
before: Final = alias_and_metadata(gateway, team)
response: Final = patch_group(
gateway, team, [pathless("replace", {"displayName": "intruder"})], key=f"sk-{uuid.uuid4().hex}"
)
assert response.status_code == 401, response.text
assert alias_and_metadata(gateway, team) == before
def test_unknown_group_is_404(gateway: Gateway) -> None:
response: Final = patch_group(
gateway, f"missing-{uuid.uuid4().hex}", [pathless("replace", {"displayName": "ghost"})]
)
assert response.status_code == 404, response.text
def test_malformed_patch_body_is_rejected(gateway: Gateway) -> None:
with gateway.scenario() as scenario:
team: Final = scenario.team()
before: Final = alias_and_metadata(gateway, team)
response: Final = gateway.request(
"PATCH", f"/scim/v2/Groups/{team}", {"schemas": [PATCH_OP_SCHEMA], "Operations": "nope"}
)
assert response.status_code in (400, 422), response.text
assert alias_and_metadata(gateway, team) == before
def test_pathless_and_pathed_scalar_coercion_agree(gateway: Gateway) -> None:
with gateway.scenario() as scenario:
via_pathless: Final = scenario.team()
via_path: Final = scenario.team()
first: Final = patch_group(gateway, via_pathless, [pathless("replace", {"displayName": 7})])
second: Final = patch_group(gateway, via_path, [pathed("replace", "displayName", 7)])
assert first.status_code == second.status_code == 200, (first.text, second.text)
assert team_alias(gateway, via_pathless) == team_alias(gateway, via_path), (first.text, second.text)
assert "" not in team_metadata(gateway, via_pathless)
def _patched_state(
candidate: Gateway, team: str, operations: Sequence[JsonValue]
) -> tuple[JsonValue, dict[str, JsonValue]]:
response: Final = patch_group(candidate, team, operations)
assert response.status_code == 200, response.text
return alias_and_metadata(candidate, team)
def test_repeated_pathless_patch_is_idempotent(gateway: Gateway) -> None:
renamed: Final = f"repeat-{uuid.uuid4().hex}"
with gateway.scenario() as scenario:
team: Final = scenario.team()
operations: Final = [pathless("replace", {"displayName": renamed, "externalId": "ext-repeat"})]
states: Final = tuple(_patched_state(gateway, team, operations) for _ in range(3))
assert all(state == states[0] for state in states), states
assert states[0][0] == renamed, states
assert "" not in states[0][1], states
def test_concurrent_pathless_renames_converge(gateway: Gateway, peer: Gateway) -> None:
with gateway.scenario() as scenario:
team: Final = scenario.team()
aliases: Final = tuple(f"race-{index}-{uuid.uuid4().hex}" for index in range(10))
candidates: Final = (gateway, peer)
with ThreadPoolExecutor(max_workers=len(aliases)) as pool:
responses: Final = tuple(
pool.map(
lambda indexed: patch_group(
candidates[indexed[0] % 2], team, [pathless("replace", {"displayName": indexed[1]})]
),
enumerate(aliases),
)
)
assert all(response.status_code == 200 for response in responses), [
response.text for response in responses if response.status_code != 200
]
alias: Final = team_alias(gateway, team)
assert alias in aliases, alias
metadata: Final = team_metadata(gateway, team)
assert "" not in metadata, metadata
assert scim_data(metadata)["displayName"] == alias, metadata
def test_team_key_keeps_serving_after_the_rename(gateway: Gateway, peer: Gateway) -> None:
with gateway.scenario() as scenario:
model: Final = scenario.model()
team: Final = scenario.team()
key: Final = scenario.key(team_id=team, models=[model])
response: Final = patch_group(
gateway, team, [pathless("replace", {"displayName": f"serving-{uuid.uuid4().hex}"})]
)
assert response.status_code == 200, response.text
eventually(lambda: model_names(peer), lambda names: model in names, seconds=60)
for candidate, marker in ((gateway, f"primary-{uuid.uuid4().hex}"), (peer, f"peer-{uuid.uuid4().hex}")):
completion: Final = candidate.chat(model, key=key, text=marker)
assert completion["choices"], completion
assert upstream_hits(gateway, marker) == 1, marker
@dataclass(frozen=True, slots=True)
class _Attempt:
team: str
alias: str
response: httpx.Response | None
class _KillSwitch:
def __init__(self, after: int, action: Callable[[], None]) -> None:
self._after: Final = after
self._action: Final = action
self._lock: Final = threading.Lock()
self._responses = 0
def tick(self) -> None:
with self._lock:
self._responses += 1
if self._responses == self._after:
self._action()
def _burst_operations(alias: str, index: int) -> Sequence[JsonValue]:
shapes: Final = (
[pathless("replace", {"displayName": alias, "externalId": f"ext-{index}"})],
[pathless("add", {"displayName": alias})],
[pathed("replace", "displayName", alias)],
)
return shapes[index % len(shapes)]
def _attempt(candidate: Gateway, team: str, index: int, switch: _KillSwitch) -> _Attempt:
alias: Final = f"burst-{index}-{uuid.uuid4().hex}"
try:
return _Attempt(team, alias, patch_group(candidate, team, _burst_operations(alias, index)))
except httpx.TransportError:
return _Attempt(team, alias, None)
finally:
switch.tick()
def _team_attempts(candidate: Gateway, team: str, offset: int, switch: _KillSwitch) -> tuple[_Attempt, ...]:
return tuple(_attempt(candidate, team, offset + index, switch) for index in range(BURST_REQUESTS_PER_TEAM))
def _burst(candidate: Gateway, teams: Sequence[str], disruption: Callable[[], None]) -> tuple[_Attempt, ...]:
switch: Final = _KillSwitch(KILL_AFTER_RESPONSES, disruption)
with ThreadPoolExecutor(max_workers=len(teams)) as pool:
per_team: Final = tuple(
pool.submit(_team_attempts, candidate, team, index * BURST_REQUESTS_PER_TEAM, switch)
for index, team in enumerate(teams)
)
return tuple(chain.from_iterable(future.result() for future in per_team))
def _burst_teams(scenario: Scenario) -> Mapping[str, str]:
origins: Final = tuple(f"origin-{uuid.uuid4().hex}" for _ in range(BURST_TEAMS))
return MappingProxyType({scenario.team(team_alias=origin): origin for origin in origins})
def _assert_team_reflected(candidate: Gateway, team: str, origin: str, sent: Sequence[_Attempt]) -> None:
aliases: Final = frozenset(attempt.alias for attempt in sent)
alias, metadata = alias_and_metadata(candidate, team)
assert "" not in metadata, metadata
if alias == origin:
assert all(attempt.response is None for attempt in sent), (team, sent)
assert "scim_managed" not in metadata, metadata
return
assert alias in aliases, (alias, aliases)
assert metadata["scim_managed"] is True, metadata
if sent[-1].response is not None:
assert alias == sent[-1].alias, (alias, sent[-1].alias)
snapshot: Final = metadata.get("scim_data")
if snapshot is not None:
assert object_value(snapshot).get("displayName") in aliases, snapshot
def _assert_burst_reflected(candidate: Gateway, teams: Mapping[str, str], attempts: Sequence[_Attempt]) -> None:
answered: Final = tuple(attempt for attempt in attempts if attempt.response is not None)
assert answered, "The whole burst failed to reach the proxy"
for attempt in answered:
assert attempt.response is not None and attempt.response.status_code == 200, attempt.response
assert attempt.response.json()["displayName"] == attempt.alias, attempt.response.text
for team, origin in teams.items():
_assert_team_reflected(candidate, team, origin, tuple(attempt for attempt in attempts if attempt.team == team))
def _patch_status(candidate: Gateway, team: str) -> int | None:
operations: Final = [pathless("replace", {"displayName": f"probe-{uuid.uuid4().hex}"})]
try:
return patch_group(candidate, team, operations).status_code
except httpx.TransportError:
return None
@pytest.mark.timeout(240)
def test_worker_kill_mid_burst_keeps_serving_and_leaves_no_empty_key(gateway: Gateway, tmp_path: Path) -> None:
with owned_proxy_process(gateway, tmp_path, {}, workers=2) as owned, gateway.scenario() as scenario:
teams: Final = _burst_teams(scenario)
workers: Final = eventually(owned.worker_pids, lambda pids: len(pids) >= 2, seconds=30)
with owned.replacing_worker(min(workers)) as kill:
attempts: Final = _burst(owned.gateway, tuple(teams), kill)
probe: Final = scenario.team()
eventually(
lambda: _patch_status(owned.gateway, probe), lambda status_code: status_code == 200, seconds=60
)
_assert_burst_reflected(owned.gateway, teams, attempts)
@pytest.mark.timeout(300)
def test_rolling_restart_mid_burst_drains_without_empty_keys(gateway: Gateway, tmp_path: Path) -> None:
with gateway.scenario() as scenario, owned_proxy_process(gateway, tmp_path, {}, workers=2) as replacement:
teams: Final = _burst_teams(scenario)
with owned_proxy_process(gateway, tmp_path, {}, workers=2) as retiring:
attempts: Final = _burst(retiring.gateway, tuple(teams), retiring.begin_shutdown)
_assert_burst_reflected(replacement.gateway, teams, attempts)