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test(agents): avoid repeating every stream delta #4171

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dpiet-oai merged 2 commits into from
Oct 26, 2026
Merged

test(agents): avoid repeating every stream delta #4171

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fc44b25
test(agents): right-size stream cache coverage
dpiet-oai Oct 23, 2026
eac0a17
test(agents): preserve sustained stream cache eviction
dpiet-oai Oct 26, 2026
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14 changes: 11 additions & 3 deletions tests/lib/streaming/agents/test_streams.py
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Original file line number Diff line number Diff line change
Expand Up @@ -481,7 +481,8 @@ def handler(arguments: dict[str, object]) -> str:

repeated_call = {"event_id": "original-call", **call()}
payloads = [turn_event("created"), repeated_call]
for index in range(5000):
delta_count = 5000
for index in range(delta_count):
delta_event: dict[str, object] = {
"type": "agent.session.turn.output_text.delta",
"event_id": f"delta-{index}",
Expand All @@ -492,17 +493,21 @@ def handler(arguments: dict[str, object]) -> str:
"content_index": 0,
"delta": str(index),
}
payloads.extend([delta_event, delta_event])
payloads.append(delta_event)
payloads.append(payloads[-1]) # Repeat the last delta after sustained cache eviction.
payloads.extend([repeated_call, turn_event("completed"), idle()])
server.body = EventBody(payloads)
deltas: list[str] = []
tool_event_deliveries = 0
if isinstance(sdk, AsyncOpenAI):
async with sdk.beta.agents.sessions.stream(
"session_test", input="Hello", tool_handlers={"search": handler}
) as stream:
async for event in stream:
if event.type == "agent.session.turn.output_text.delta":
deltas.append(event.delta)
elif event.event_id == repeated_call["event_id"]:
tool_event_deliveries += 1
assert len(stream._state.event_ids) <= 1024
assert len(stream._state.recent_events) <= 1024
else:
Expand All @@ -512,9 +517,12 @@ def handler(arguments: dict[str, object]) -> str:
for event in sync_stream:
if event.type == "agent.session.turn.output_text.delta":
deltas.append(event.delta)
elif event.event_id == repeated_call["event_id"]:
tool_event_deliveries += 1
assert len(sync_stream._state.event_ids) <= 1024
assert len(sync_stream._state.recent_events) <= 1024
assert deltas == [str(index) for index in range(5000)]
assert deltas == [str(index) for index in range(delta_count)]
assert tool_event_deliveries == 2
assert calls == [{"query": "test"}]
assert len(server.inputs()) == 2
assert server.body.closed
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