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interactive-story/backend/tests/test_retry_variants.py
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parththakkar106andClaude Opus 5 a7bf47a35e Let a backup carry a story that went two ways
A bundle had one list and a forked adventure has two stories, so export was
emitting every branch's turns interleaved by index — a mangled story rather
than lost data, and unreachable only because forking has no UI yet.
`ai-dnd-adventure-v2` carries the branches, the depth each one left its
parent at, which attempt at every turn is the story, and what each node
left behind. That last one is not decoration: the after-snapshots are what
a branch switch puts back, and a bundle without them imports a tree nobody
can switch inside.

`app/bundle.py` owns both formats and nothing else knows either. The v1
reader stays — those files are already on people's disks — and it is now
the only place a `variants` array exists anywhere.

The rule the module is built on is that a bundle carries what was chosen
and never what is derived. The head branch, the fork points, the live flags
and the anchors are decisions somebody made. The lineage, the head depth,
the legacy `index` and the variant ordinals are computed from those and are
rebuilt on the way in, because a bundle is a text file anybody can edit and
a derived field shipped beside its source is a chance for the file to
disagree with itself where no read would report it.

`index` is the one that stops being academic here. It agreed with `depth`
until SP5, and this is the first writer that has to fill it for a forked
story, where two branches both hold a node at depth 4. It is allocated one
per turn instead: siblings share it, no two coordinates do.

Everything a hand-edited file can get wrong about the shape of a tree is a
400 raised before the adventure row exists, because a half-applied import
is exactly the failure this phase exists to end — a story that goes quiet.
A file wrong about which attempt is live is corrected rather than refused;
that is an invariant of the database, not of the format.

Measured on the 600-action fixture: 587 kB to 911 kB, and all of the
increase is the outcomes at 489 B a node — the coordinates themselves save
57.5 B a node against the old turn-and-variants shape. Twenty forks add
660 B. 4.3% of the import body cap.

381 tests green, 16 of them new in test_bundle_v2.py. No migration, no
vacuum owed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015H5qiyiR7gtFQaoDphHZ3g
2026-08-18 19:14:07 +05:30

360 lines
13 KiB
Python

"""End-to-end HTTP tests for retry history: every attempt at an AI turn is kept
as a variant of the same action, browsable and (for the last message)
switchable, restoring the world/script state that attempt produced.
python -m pytest tests/test_retry_variants.py -v
"""
import os
import tempfile
_tmp = tempfile.NamedTemporaryFile(suffix=".db", delete=False)
_tmp.close()
os.environ["AIDND_DB_PATH"] = _tmp.name
os.environ.pop("AIDND_DATABASE_URL", None)
os.environ.pop("DATABASE_URL", None)
import pytest
from fastapi import Depends
from fastapi.testclient import TestClient
from app import auth, limits, models
from app.database import Base, SessionLocal, engine, get_db
from app.main import app
from app.providers import PromptParts, ProviderError
from app.routers import adventures
SCHEMA = {"player": {"hp": {"min": 0, "max": 100, "initial": 100}}}
# Each turn spends 10 gold, so a double-applied or un-rolled-back attempt shows.
GOLD_SCRIPT = """
const modifier = (text) => {
state.gold = (state.gold || 0) + 10;
return { text };
};
modifier(text);
"""
class ScriptedProvider:
"""Streams the next canned reply each call, so successive retries differ."""
replies: list = []
calls = 0
prompts: list = [] # every assembled (system, story) pair, for context assertions
def __init__(self, *a, **k):
pass
async def generate(self, parts: PromptParts, *, temperature, max_tokens):
index = min(ScriptedProvider.calls, len(ScriptedProvider.replies) - 1)
ScriptedProvider.calls += 1
ScriptedProvider.prompts.append((parts.system, parts.story))
reply = ScriptedProvider.replies[index]
if isinstance(reply, Exception):
raise reply
yield ("text", reply)
@pytest.fixture()
def client(monkeypatch):
Base.metadata.create_all(bind=engine)
setup = SessionLocal()
user = models.User(is_guest=False, email="variants@example.com")
setup.add(user)
setup.flush()
setup.add(models.Settings(user_id=user.id, api_key="enc:dummy", model="test-model"))
scenario = models.Scenario(user_id=user.id, title="S", stat_schema=SCHEMA)
setup.add(scenario)
setup.flush()
adv = models.Adventure(
user_id=user.id, title="Cave", scenario_id=scenario.id,
script_state={}, world_state={"player": {"hp": 100}},
)
setup.add(adv)
setup.flush()
setup.add(models.Action(adventure_id=adv.id, index=0, type="start", text="You enter a cave."))
setup.add(models.AdventureScript(
adventure_id=adv.id, position=0, enabled=True, name="Gold", output_js=GOLD_SCRIPT,
))
setup.commit()
adv_id, user_id = adv.id, user.id
setup.close()
ScriptedProvider.replies = ["Attempt one."]
ScriptedProvider.calls = 0
ScriptedProvider.prompts = []
monkeypatch.setattr(adventures, "OpenAICompatibleProvider", ScriptedProvider)
monkeypatch.setattr(auth, "resolve_provider_config", lambda s: auth.ProviderConfig(
"http://fake", "k", "test-model", False))
monkeypatch.setattr(limits, "rate_limit", lambda *a, **k: None)
monkeypatch.setattr(limits, "check_row_cap", lambda *a, **k: None)
def _current_user(db=Depends(get_db)):
return db.get(models.User, user_id)
app.dependency_overrides[auth.get_current_user] = _current_user
c = TestClient(app)
c.adv_id = adv_id
try:
yield c
finally:
app.dependency_overrides.clear()
adventures._active_turns.clear()
Base.metadata.drop_all(bind=engine)
def _adv(adv_id):
db = SessionLocal()
try:
adv = db.get(models.Adventure, adv_id)
return adv.script_state, adv.world_state
finally:
db.close()
def _actions(client):
return client.get(f"/api/adventures/{client.adv_id}").json()["actions"]
def _play(client, text="look around"):
r = client.post(f"/api/adventures/{client.adv_id}/actions",
json={"type": "do", "text": text})
assert r.status_code == 200, r.text
def _retry(client):
r = client.post(f"/api/adventures/{client.adv_id}/retry")
assert r.status_code == 200, r.text
return r
# ---------------------------------------------------------------- keeping them
def test_retry_keeps_the_discarded_attempt(client):
ScriptedProvider.replies = ["Attempt one.", "Attempt two."]
_play(client)
assert _actions(client)[-1]["text"] == "Attempt one."
_retry(client)
actions = _actions(client)
# One AI action still, not two — the retry replaced the live text in place.
assert [a["type"] for a in actions] == ["start", "do", "ai"]
last = actions[-1]
assert last["text"] == "Attempt two."
assert last["variant_count"] == 2
assert last["variant_index"] == 1
r = client.get(f"/api/adventures/{client.adv_id}/actions/{last['id']}/variants")
assert r.status_code == 200, r.text
assert [v["text"] for v in r.json()] == ["Attempt one.", "Attempt two."]
assert [v["active"] for v in r.json()] == [False, True]
def test_retry_context_excludes_the_attempt_being_replaced(client):
"""The whole point of a retry is a fresh take on the *same* turn. The row
now survives the retry (it holds the variant history), so it is still in
`adventure.actions` while the replacement context is assembled — it must be
filtered out, or the model is asked to continue *past* the attempt it is
supposed to be replacing and writes a sequel that blends both."""
ScriptedProvider.replies = ["Attempt one.", "Attempt two."]
_play(client)
_retry(client)
retry_story = ScriptedProvider.prompts[-1][1]
assert "Attempt one." not in retry_story
# The turn's own player action must still be there — it's what to respond to.
assert "look around" in retry_story
assert "You enter a cave." in retry_story
def test_retry_context_keeps_earlier_ai_turns(client):
"""Only the action being retried is dropped, not AI history in general."""
ScriptedProvider.replies = ["First turn.", "Second turn.", "Second, again."]
_play(client, "go north")
_play(client, "go south")
_retry(client)
retry_story = ScriptedProvider.prompts[-1][1]
assert "First turn." in retry_story
assert "Second turn." not in retry_story
def test_never_retried_action_has_no_variants(client):
_play(client)
last = _actions(client)[-1]
assert last["variant_count"] == 0
assert client.get(
f"/api/adventures/{client.adv_id}/actions/{last['id']}/variants").json() == []
def test_three_attempts_all_kept_in_order(client):
ScriptedProvider.replies = ["One.", "Two.", "Three."]
_play(client)
_retry(client)
_retry(client)
last = _actions(client)[-1]
assert last["variant_count"] == 3
assert last["variant_index"] == 2
variants = client.get(
f"/api/adventures/{client.adv_id}/actions/{last['id']}/variants").json()
assert [v["text"] for v in variants] == ["One.", "Two.", "Three."]
# ---------------------------------------------------------------- switching
def test_switching_back_restores_that_attempt_state(client):
ScriptedProvider.replies = [
"You take a scratch.\n```state\n{\"player.hp\": -5}\n```",
"You take a beating.\n```state\n{\"player.hp\": -40}\n```",
]
_play(client)
assert _adv(client.adv_id)[1]["player"]["hp"] == 95
_retry(client)
script_state, world_state = _adv(client.adv_id)
assert world_state["player"]["hp"] == 60
assert script_state == {"gold": 10} # rolled back, not stacked to 20
last = _actions(client)[-1]
r = client.post(
f"/api/adventures/{client.adv_id}/actions/{last['id']}/variant", json={"index": 0})
assert r.status_code == 200, r.text
assert r.json()["text"].startswith("You take a scratch")
assert r.json()["variant_index"] == 0
# The stats follow the narration back.
script_state, world_state = _adv(client.adv_id)
assert world_state["player"]["hp"] == 95
assert script_state == {"gold": 10}
# And forward again.
client.post(f"/api/adventures/{client.adv_id}/actions/{last['id']}/variant",
json={"index": 1})
assert _adv(client.adv_id)[1]["player"]["hp"] == 60
def test_switching_updates_the_world_change_chips(client):
ScriptedProvider.replies = [
"A scratch.\n```state\n{\"player.hp\": -5}\n```",
"A beating.\n```state\n{\"player.hp\": -40}\n```",
]
_play(client)
_retry(client)
last = _actions(client)[-1]
assert last["world_changes"][0]["delta"] == -40
client.post(f"/api/adventures/{client.adv_id}/actions/{last['id']}/variant",
json={"index": 0})
assert _actions(client)[-1]["world_changes"][0]["delta"] == -5
def test_cannot_switch_a_turn_the_story_moved_past(client):
ScriptedProvider.replies = ["One.", "Two.", "Three."]
_play(client)
_retry(client)
retried = _actions(client)[-1]
_play(client) # story continues from "Two."
r = client.post(
f"/api/adventures/{client.adv_id}/actions/{retried['id']}/variant", json={"index": 0})
assert r.status_code == 400
assert "latest message" in r.json()["detail"]
# Still readable, though — that's the whole point of keeping them.
variants = client.get(
f"/api/adventures/{client.adv_id}/actions/{retried['id']}/variants").json()
assert [v["text"] for v in variants] == ["One.", "Two."]
def test_switching_to_a_missing_index_is_rejected(client):
ScriptedProvider.replies = ["One.", "Two."]
_play(client)
_retry(client)
last = _actions(client)[-1]
r = client.post(
f"/api/adventures/{client.adv_id}/actions/{last['id']}/variant", json={"index": 7})
assert r.status_code == 400
# ---------------------------------------------------------------- edge cases
def test_failed_retry_leaves_the_previous_attempt_in_charge(client):
"""A provider error mid-retry must undo the rollback, or the stats on
screen would silently disagree with the text still shown."""
ScriptedProvider.replies = ["Attempt one.", ProviderError("upstream is down")]
_play(client)
assert _adv(client.adv_id)[0] == {"gold": 10}
client.post(f"/api/adventures/{client.adv_id}/retry")
actions = _actions(client)
assert actions[-1]["text"] == "Attempt one." # text never lost
assert _adv(client.adv_id)[0] == {"gold": 10} # and the state still matches it
def test_undo_removes_the_action_and_its_history(client):
ScriptedProvider.replies = ["One.", "Two."]
_play(client)
_retry(client)
r = client.post(f"/api/adventures/{client.adv_id}/undo")
assert r.status_code == 200, r.text
# Undo returns the newest window now, not the whole story.
assert [a["type"] for a in r.json()["actions"]] == ["start"]
assert _adv(client.adv_id)[0] == {}
def test_editing_the_text_updates_the_live_variant(client):
ScriptedProvider.replies = ["One.", "Two."]
_play(client)
_retry(client)
last = _actions(client)[-1]
client.patch(f"/api/adventures/{client.adv_id}/actions/{last['id']}",
json={"text": "Two, but better."})
# Page away and back: the edit must survive, not be reverted by the switch.
client.post(f"/api/adventures/{client.adv_id}/actions/{last['id']}/variant",
json={"index": 0})
client.post(f"/api/adventures/{client.adv_id}/actions/{last['id']}/variant",
json={"index": 1})
assert _actions(client)[-1]["text"] == "Two, but better."
def test_retry_keeps_the_turn_index(client):
"""A retry re-runs the same turn, so the world-state clock (which drives
cooldowns) must not advance."""
ScriptedProvider.replies = ["One.", "Two."]
_play(client)
before = _actions(client)[-1]["index"]
_retry(client)
assert _actions(client)[-1]["index"] == before
def test_export_and_import_round_trips_variants(client):
ScriptedProvider.replies = ["One.", "Two."]
_play(client)
_retry(client)
bundle = client.get(f"/api/adventures/{client.adv_id}/export").json()
# SP6: the attempts are nodes in the bundle too, sharing one coordinate,
# and `live` says which of them the story tells. The `variants` array
# survives only in the v1 *reader* — see the hand-edited bundle below.
ai = [a for a in bundle["actions"] if a["type"] == "ai"]
assert [(a["text"], a["live"]) for a in ai] == [("One.", False), ("Two.", True)]
assert len({(a["branch"], a["depth"]) for a in ai}) == 1
r = client.post("/api/adventures/import", json=bundle)
assert r.status_code == 201, r.text
imported = r.json()["id"]
actions = client.get(f"/api/adventures/{imported}").json()["actions"]
assert actions[-1]["variant_count"] == 2
assert actions[-1]["variant_index"] == 1
def test_import_clamps_an_out_of_range_variant_index(client):
bundle = {
"format": "ai-dnd-adventure-v1", "title": "Hand-edited",
"actions": [{
"index": 0, "type": "ai", "text": "Only.",
"variants": [{"text": "Only."}], "variantIndex": 9,
}],
}
r = client.post("/api/adventures/import", json=bundle)
assert r.status_code == 201, r.text
actions = client.get(f"/api/adventures/{r.json()['id']}").json()["actions"]
assert actions[0]["variant_index"] == 0