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from __future__ import annotations
import copy
import io
import json
import pytest
from nftbench import evaluate
from nftbench.agents import openrouter
from nftbench.agents.gemini_generate import RECACHE_TOKENS
from nftbench.agents.openrouter import CACHE_EXPIRE_SECONDS, CACHE_MIN_TOKENS, OpenRouterBackend, SpendGuard
MODEL = "google/gemini-3.8-flash"
REPLY = json.dumps({"name": "declare_infeasible", "arguments": {"reason": "mock"}})
MARK = {"type": "ephemeral"}
class Fake:
def __init__(self, model=MODEL):
self.model = model
self.payloads = []
def __call__(self, req, timeout=None):
self.payloads.append(json.loads(req.data))
body = {
"model": self.model,
"choices": [{"message": {"role": "assistant", "content": REPLY}, "finish_reason": "stop"}],
"usage": {"cost": 0.001, "prompt_tokens": 10, "completion_tokens": 5},
}
response = io.BytesIO(json.dumps(body).encode())
response.status = 200
return response
class Clock:
def __init__(self):
self.now = 1000.0
def __call__(self):
return self.now
def make(tmp_path, monkeypatch, *, cache=True, name="events.jsonl"):
monkeypatch.setenv("OPENROUTER_API_KEY", "test-only-openrouter-key")
fake, clock = Fake(), Clock()
backend = OpenRouterBackend(
MODEL, guard=SpendGuard(10), events_path=tmp_path / name, opener=fake, sleep=lambda _: None, cache=cache, clock=clock,
)
return backend, fake, clock
def item(role, chars):
return {"role": role, "content": "x" * chars}
def marks(payload):
"""Indices into the items (messages after the system one) that carry cache_control."""
found = []
for index, message in enumerate(payload["messages"][1:]):
if isinstance(message["content"], list):
assert message["content"] == [{"type": "text", "text": message["content"][0]["text"], "cache_control": MARK}]
found.append(index)
return found
def events(path):
return [json.loads(line) for line in path.read_text().splitlines()]
HEAD = "S"
THRESHOLD_CHARS = CACHE_MIN_TOKENS * 4 - len(HEAD)
def test_no_breakpoint_below_the_write_minimum(tmp_path, monkeypatch):
backend, fake, _ = make(tmp_path, monkeypatch)
items = [item("user", THRESHOLD_CHARS - 1)]
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[0]) == []
assert fake.payloads[0]["messages"][1:] == items
assert events(tmp_path / "events.jsonl")[0]["cache_breakpoint"] is None
def test_breakpoint_placed_on_the_last_item_at_the_threshold(tmp_path, monkeypatch):
backend, fake, _ = make(tmp_path, monkeypatch)
items = [item("user", 10), item("assistant", 10), item("user", THRESHOLD_CHARS - 20)]
before = copy.deepcopy(items)
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[0]) == [2]
assert fake.payloads[0]["messages"][3]["content"][0]["text"] == items[2]["content"]
assert fake.payloads[0]["messages"][1:3] == items[:2]
assert items == before
assert events(tmp_path / "events.jsonl")[0]["cache_breakpoint"] == 2
def test_breakpoint_stays_on_the_same_bytes_under_the_suffix_bound(tmp_path, monkeypatch):
backend, fake, clock = make(tmp_path, monkeypatch)
items = [item("user", THRESHOLD_CHARS)]
backend.invoke_items(HEAD, items)
first = fake.payloads[0]["messages"][1]
for turn in range(3):
clock.now += 60
items = [*items, item("assistant", 100), item("user", RECACHE_TOKENS)]
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[-1]) == [0]
assert json.dumps(fake.payloads[-1]["messages"][1]) == json.dumps(first)
assert [e["cache_breakpoint"] for e in events(tmp_path / "events.jsonl")] == [0, 0, 0, 0]
def test_breakpoint_moves_to_the_last_item_past_the_suffix_bound(tmp_path, monkeypatch):
backend, fake, _ = make(tmp_path, monkeypatch)
items = [item("user", THRESHOLD_CHARS)]
backend.invoke_items(HEAD, items)
items = [*items, item("assistant", 4), item("user", RECACHE_TOKENS * 4 - 4)]
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[-1]) == [0]
items = [*items, item("assistant", 4), item("user", 4)]
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[-1]) == [4]
assert [e["cache_breakpoint"] for e in events(tmp_path / "events.jsonl")] == [0, 0, 4]
def test_breakpoint_moves_after_the_cache_lifetime(tmp_path, monkeypatch):
backend, fake, clock = make(tmp_path, monkeypatch)
items = [item("user", THRESHOLD_CHARS)]
backend.invoke_items(HEAD, items)
clock.now += CACHE_EXPIRE_SECONDS
items = [*items, item("assistant", 4), item("user", 4)]
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[-1]) == [0]
clock.now += 1
items = [*items, item("assistant", 4), item("user", 4)]
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[-1]) == [4]
# The moved breakpoint's lifetime counts from when it moved.
clock.now += CACHE_EXPIRE_SECONDS
items = [*items, item("assistant", 4), item("user", 4)]
backend.invoke_items(HEAD, items)
assert marks(fake.payloads[-1]) == [4]
def test_episodes_never_share_a_breakpoint(tmp_path, monkeypatch):
first, first_fake, _ = make(tmp_path, monkeypatch, name="a.jsonl")
second, second_fake, _ = make(tmp_path, monkeypatch, name="b.jsonl")
first.invoke_items(HEAD, [item("user", THRESHOLD_CHARS)])
second.invoke_items(HEAD, [item("user", 10)])
assert marks(first_fake.payloads[0]) == [0] and marks(second_fake.payloads[0]) == []
# A backend reused for another conversation drops a breakpoint that is not on that conversation's prefix.
first.invoke_items(HEAD, [item("assistant", 10)])
assert marks(first_fake.payloads[-1]) == []
first.invoke_items(HEAD, [item("user", THRESHOLD_CHARS)])
first.invoke_items("T", [item("user", THRESHOLD_CHARS), item("assistant", 4), item("user", 4)])
assert marks(first_fake.payloads[-1]) == [2]
@pytest.mark.parametrize("cache", [False, True])
def test_request_bytes_unchanged_without_a_breakpoint(tmp_path, monkeypatch, cache):
backend, fake, _ = make(tmp_path, monkeypatch, cache=cache)
items = [item("user", THRESHOLD_CHARS - (1 if cache else -100000))]
backend.invoke_items(HEAD, items)
assert fake.payloads[0] == {
"model": MODEL, "messages": [{"role": "system", "content": HEAD}, *items], "max_tokens": 32000, "usage": {"include": True},
}
assert ("cache_breakpoint" in events(tmp_path / "events.jsonl")[0]) is cache
# evaluate.py plumbing
@pytest.fixture
def google_fake(monkeypatch):
monkeypatch.setenv("OPENROUTER_API_KEY", "dummy_openrouter_key_for_cache")
fake = Fake()
monkeypatch.setattr("urllib.request.urlopen", fake)
return fake
def args(out_dir, *extra, model=MODEL, instances="F1a_04"):
return ["--tier", "synthetic", "--instances", instances, "--model", model, "--max-usd", "1", "--out", str(out_dir), *extra]
def test_flag_is_recorded_and_reaches_one_backend_per_episode(tmp_path, google_fake, monkeypatch):
built = []
class Recording(OpenRouterBackend):
def __init__(self, *a, **kw):
super().__init__(*a, **kw)
built.append(self)
monkeypatch.setattr(evaluate, "OpenRouterBackend", Recording)
out_dir = tmp_path / "cached"
assert evaluate.main(args(out_dir, "--openrouter-cache", "--concurrency", "2", instances="F1a_04,F1a_05")) == 0
assert json.loads((out_dir / "run.json").read_text())["openrouter_cache"] is True
assert len(built) == 2 and len(set(map(id, built))) == 2 and all(b.cache for b in built)
assert all("cache_breakpoint" in record for record in events(out_dir / "events.jsonl"))
plain = tmp_path / "plain"
assert evaluate.main(args(plain)) == 0
assert "openrouter_cache" not in json.loads((plain / "run.json").read_text())
assert not built[-1].cache
@pytest.mark.parametrize("argv", [
args("OUT", "--openrouter-cache", model="qwen/qwen3.8-flash"),
["--tier", "synthetic", "--instances", "F1a_04", "--agent", "reference", "--out", "OUT", "--openrouter-cache"],
args("OUT", "--openrouter-cache", "--endpoint", "http://gpu-node-07:8000"),
])
def test_flag_refused_without_an_openrouter_google_model(tmp_path, google_fake, argv):
out_dir = tmp_path / "bad"
argv = [str(out_dir) if a == "OUT" else a for a in argv]
assert evaluate.main(argv) == 1
assert not (out_dir / "run.json").exists()
assert google_fake.payloads == []
@pytest.mark.parametrize("first,second", [(("--openrouter-cache",), ()), ((), ("--openrouter-cache",))])
def test_resume_refused_when_the_flag_changes(tmp_path, google_fake, first, second):
out_dir = tmp_path / "resume"
assert evaluate.main(args(out_dir, *first)) == 0
before = (out_dir / "run.json").read_text()
calls = len(google_fake.payloads)
assert evaluate.main(args(out_dir, *second)) == 1
assert (out_dir / "run.json").read_text() == before
assert len(google_fake.payloads) == calls
assert evaluate.main(args(out_dir, *first)) == 0
# Gemini's MALFORMED_FUNCTION_CALL finish, which OpenRouter reports as finish_reason "error"
class ChoiceFake(Fake):
def __init__(self, choice):
super().__init__()
self.choice = choice
def __call__(self, req, timeout=None):
self.payloads.append(json.loads(req.data))
body = {"model": MODEL, "choices": [self.choice],
"usage": {"cost": 0, "prompt_tokens": 0, "completion_tokens": 0, "total_tokens": 0}}
response = io.BytesIO(json.dumps(body).encode())
response.status = 200
return response
def malformed(**changes):
choice = {"finish_reason": "error", "native_finish_reason": "MALFORMED_FUNCTION_CALL",
"message": {"role": "assistant", "content": REPLY}}
for key, value in changes.items():
if key == "content":
if value is ...:
del choice["message"]["content"]
else:
choice["message"]["content"] = value
else:
choice[key] = value
return choice
def finish_backend(tmp_path, monkeypatch, choice):
monkeypatch.setenv("OPENROUTER_API_KEY", "test-only-openrouter-key")
fake = ChoiceFake(choice)
backend = OpenRouterBackend(MODEL, guard=SpendGuard(10), events_path=tmp_path / "events.jsonl", opener=fake, sleep=lambda _: None)
return backend, fake
def test_malformed_function_call_with_text_is_the_reply(tmp_path, monkeypatch):
backend, fake = finish_backend(tmp_path, monkeypatch, malformed())
invocation = backend.invoke("S", "P")
assert invocation.text == REPLY and len(fake.payloads) == 1
assert invocation.usage == {"usage": {"cost": 0, "prompt_tokens": 0, "completion_tokens": 0, "total_tokens": 0}}
assert json.loads(backend.complete(json.dumps({"messages": [{"role": "system", "content": "S"}], "tools": []})))["tool_calls"][0]["name"] == (
"declare_infeasible")
@pytest.mark.parametrize("choice,kind", [
(malformed(native_finish_reason="OTHER"), "incomplete_output"),
(malformed(native_finish_reason=None), "incomplete_output"),
(malformed(error={"code": 502, "message": "upstream"}), "incomplete_output"),
(malformed(content=""), "incomplete_output"),
(malformed(content=" "), "incomplete_output"),
(malformed(content=None), "incomplete_output"),
(malformed(content=...), "incomplete_output"),
(malformed(content=["not", "text"]), "incomplete_output"),
(malformed(content={"text": REPLY}), "incomplete_output"),
])
def test_other_error_finishes_still_fail(tmp_path, monkeypatch, choice, kind):
backend, fake = finish_backend(tmp_path, monkeypatch, choice)
with pytest.raises(openrouter.CLIFailure) as failure:
backend.invoke("S", "P")
assert failure.value.kind == kind
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