diet-guard/diet_guard/tests/test_state_today.py
Krzysztof kuhy Rudnicki af461d3157 Split _state.py and _tk_fakes.py; make the food-log redirect fail closed
Eighth batch of the 250-line sweep (over-cap count 28 -> 25).

  _state.py       366 -> 197  (+ _state_today.py, _state_sync.py)
  test_state.py   400 -> 221  (+ test_state_today.py, test_state_sync.py)
  _tk_fakes.py    368 -> 167  (+ _tk_fakes_containers.py, _tk_fakes_canvas.py)

_state.py is the file conftest patches FOOD_LOG_FILE on, so the split is
constrained rather than free: `FOOD_LOG_FILE` and the two functions that open
it stay put, and the derived read model (_state_today) and the sync/undo
helpers (_state_sync) reach the file only through _state's private
_read_raw_log/_write_log. Callers were rewired to import from the new modules
directly rather than via a circular re-export.

That constraint is now enforced instead of merely documented. Moving a reader
of FOOD_LOG_FILE into a sibling would leave conftest's patch pointing at a
name nothing reads: check_patch_targets.py still exits 0 (the path resolves)
and the runtime is unchanged (a file write, not a network call), so the suite
would go green while writing to the real ~/.local/share/diet_guard and the
next sync tick would publish it. test_state_redirect.py asserts both halves --
only _constants and _state may name the constant, and the redirect
demonstrably moves a real write off the live path. Verified it fails closed by
adding a FOOD_LOG_FILE reader to _state_today: it named that module exactly.

_tk_fakes.py keeps _FAKE_TK/_FAKE_TTK and gains an explicit __all__, since the
re-exports are load-bearing and ruff would otherwise strip them as unused. The
identity canary from the previous commit covers the split: breaking one entry
in the assembly (Canvas=object) fails 8 gate tests loudly rather than silently
building real widgets.

Verified: 706 Python tests / 100% branch coverage, check_patch_targets 0,
pre-commit clean, ~/.local/share/diet_guard byte-identical.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RA9ynjqXPnexRQnR5oAuCC
2026-08-15 20:21:26 +02:00

89 lines
2.8 KiB
Python

"""Tests for _state.py — the HMAC-signed daily food log.
State files are redirected into ``tmp_path`` and a deterministic HMAC key is
provided by the autouse conftest fixtures, so signing, verification, and the
defensive read paths are all exercised in isolation.
"""
from __future__ import annotations
import json
import pytest
from diet_guard import _state
from diet_guard._budget import BudgetNotInitializedError, write_budget
from diet_guard._estimator import Nutrition
from diet_guard._state import (
log_meal,
)
from diet_guard._state_today import (
consumption_band,
logged_slots_today,
remaining_budget,
)
def _nut(
kcal: float, *, protein: float = 0, carbs: float = 0, fat: float = 0
) -> Nutrition:
"""Build a Nutrition for a logged meal."""
return Nutrition(kcal, protein, carbs, fat, 100, "manual")
def _raw() -> dict[str, list[dict[str, object]]]:
"""Read the raw log file as parsed JSON (no verification)."""
return json.loads(_state.FOOD_LOG_FILE.read_text(encoding="utf-8"))
class TestLoggedSlots:
"""Which slots today's log has satisfied."""
def test_int_slots_counted(self) -> None:
"""Integer slot tags are reported."""
log_meal("a", _nut(1), slot=8)
log_meal("b", _nut(1), slot=12)
assert logged_slots_today() == {8, 12}
def test_bool_slot_excluded(self) -> None:
"""A bool masquerading as a slot is ignored."""
log_meal("a", _nut(1), slot=8)
raw = _raw()
day = next(iter(raw))
raw[day].append({"kcal": 1, "slot": True})
_state.FOOD_LOG_FILE.write_text(json.dumps(raw), encoding="utf-8")
assert logged_slots_today() == {8}
class TestBudgetViews:
"""Remaining budget and the qualitative band."""
def test_remaining_requires_budget(self) -> None:
"""With no budget sealed, remaining_budget raises."""
with pytest.raises(BudgetNotInitializedError):
remaining_budget()
def test_remaining_value(self) -> None:
"""Remaining is budget minus today's total."""
write_budget(2000)
log_meal("lunch", _nut(500), slot=12)
assert remaining_budget() == 1500.0
def test_band_on_track(self) -> None:
"""Well under the warn fraction is 'on track'."""
write_budget(2000)
log_meal("a", _nut(500), slot=8)
assert consumption_band() == "on track"
def test_band_approaching(self) -> None:
"""At or above the warn fraction but under budget is 'approaching limit'."""
write_budget(2000)
log_meal("a", _nut(1700), slot=8)
assert consumption_band() == "approaching limit"
def test_band_over(self) -> None:
"""At or above budget is 'OVER BUDGET'."""
write_budget(2000)
log_meal("a", _nut(2100), slot=8)
assert consumption_band() == "OVER BUDGET"