---
phase: 01-ceiling-save-on-exit
verified: 2026-06-12T07:30:00Z
status: passed
score: 4/4 must-haves verified
overrides_applied: 0
---

# Phase 1: Ceiling Save-on-Exit Verification Report

**Phase Goal:** Exiting a `CeilingLight` `async with` block reliably persists current state to disk — no uplight/downlight state is silently lost on context exit
**Verified:** 2026-06-12T07:30:00Z
**Status:** passed
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| #  | Truth                                                                                                                                                | Status     | Evidence                                                                              |
|----|------------------------------------------------------------------------------------------------------------------------------------------------------|------------|---------------------------------------------------------------------------------------|
| 1  | Exiting `async with CeilingLight(..., state_file=path)` writes state to file before connection closes; TEST-01 proves it                             | VERIFIED   | `__aexit__` lines 207-231 in ceiling.py; guard + save before `super().__aexit__()`; test_save_on_exit_writes_state_file PASSES |
| 2  | Exiting with `state_file=None` creates no file and raises no error; TEST-02 proves it                                                                | VERIFIED   | `if self._state_file:` guard at line 222 skips save; test_save_on_exit_no_op_without_state_file PASSES |
| 3  | Body exception propagates unchanged; save I/O failure is logged and swallowed (never raised); TEST-03 proves it                                      | VERIFIED   | Returns `None` (no `return True`); `try/except Exception` with `_LOGGER.warning`; unconditional `super().__aexit__()`; test_save_on_exit_body_exception_propagates PASSES |
| 4  | Existing `__aenter__` behaviour and `close()` cleanup run unchanged; full suite green with pyright (0 errors) and ruff clean                         | VERIFIED   | `__aenter__` untouched per diff; `super().__aexit__()` unconditional; pyright 0 errors; ruff clean; 2499/2500 tests pass (1 pre-existing flaky network test, see note) |

**Score:** 4/4 truths verified

### Required Artifacts

| Artifact                                               | Expected                                           | Status     | Details                                                                              |
|--------------------------------------------------------|----------------------------------------------------|------------|--------------------------------------------------------------------------------------|
| `src/lifx/devices/ceiling.py`                          | `CeilingLight.__aexit__` override saving state before `super().__aexit__()` | VERIFIED   | Lines 207-231; contains `async def __aexit__`, `if self._state_file:` guard, `_save_state_to_file()` call, `await super().__aexit__(exc_type, exc_val, exc_tb)` |
| `tests/test_devices/test_state_ceiling.py`             | `TestCeilingLightSaveOnExit` class with TEST-01/02/03 | VERIFIED   | Class at line 431; three test methods at lines 444, 465, 481; all PASS against embedded emulator |

### Key Link Verification

| From                                    | To                                          | Via                                              | Status  | Details                                                  |
|-----------------------------------------|---------------------------------------------|--------------------------------------------------|---------|----------------------------------------------------------|
| `CeilingLight.__aexit__` (line 222)     | `_save_state_to_file()` (line 1289)         | `if self._state_file:` guard at call site        | WIRED   | Guard confirmed at line 222; save call at line 224       |
| `CeilingLight.__aexit__` (line 231)     | `Device.__aexit__` (base.py line 644)       | `await super().__aexit__(exc_type, exc_val, exc_tb)` unconditionally | WIRED   | Confirmed at line 231; runs after save attempt regardless of outcome |

### Data-Flow Trace (Level 4)

Not applicable. This phase does not add data-rendering components; the change is a lifecycle method (`__aexit__`) that calls an existing I/O helper. The data flow (`_save_state_to_file` → JSON file → `_load_state_from_file`) is pre-existing and tested end-to-end by TEST-01.

### Behavioral Spot-Checks

| Behavior                                   | Command                                                                                             | Result                     | Status  |
|--------------------------------------------|-----------------------------------------------------------------------------------------------------|----------------------------|---------|
| All three SaveOnExit tests pass            | `uv run --frozen pytest tests/test_devices/test_state_ceiling.py -k SaveOnExit -v`                 | 3 passed in 1.58s          | PASS    |
| pyright reports 0 errors on ceiling.py     | `uv run pyright src/lifx/devices/ceiling.py`                                                       | 0 errors, 0 warnings       | PASS    |
| ruff reports no issues on modified files   | `uv run ruff check src/lifx/devices/ceiling.py tests/test_devices/test_state_ceiling.py`           | All checks passed          | PASS    |
| Full regression suite                      | `uv run --frozen pytest --tb=no -q`                                                                 | 2499 passed, 1 failed (pre-existing flaky, see note) | PASS    |

**Note on suite failure:** `tests/test_network/test_connection.py::TestDeviceConnection::test_different_connections_concurrent` fails intermittently in a full-suite run but passes in isolation. The test file was last modified in commit `3c505ab` ("fix: fix flaky tests on Windows and macOS CI runners") — well before this phase. The failure is a timing/race condition in concurrent network testing; it has no dependency on any code touched by this phase. The CLAUDE.md rules require noting it rather than silently skipping.

### Probe Execution

No phase-declared or conventional probes found. Not applicable.

### Requirements Coverage

| Requirement | Source Plan | Description                                                                                          | Status    | Evidence                                              |
|-------------|-------------|------------------------------------------------------------------------------------------------------|-----------|-------------------------------------------------------|
| CEIL-01     | 01-01-PLAN  | Context exit with `state_file` set persists in-memory state before connection close                  | SATISFIED | `__aexit__` guard + save before `super().__aexit__()`; TEST-01 PASSES |
| CEIL-02     | 01-01-PLAN  | Context exit with `state_file=None` writes no file and raises no error                               | SATISFIED | `if self._state_file:` guard at call site; TEST-02 PASSES |
| CEIL-03     | 01-01-PLAN  | Save I/O failure never raises out of `__aexit__` and never suppresses a body exception               | SATISFIED | `try/except Exception` + WARNING log; implicit `None` return; TEST-03 PASSES |
| CEIL-04     | 01-01-PLAN  | `__aenter__` and `close()` run unchanged; full suite green with pyright + ruff clean                 | SATISFIED | Diff confirms `__aenter__` untouched; unconditional `super().__aexit__()`; all gates pass |
| TEST-01     | 01-01-PLAN  | Test proves state is written on exit when `state_file` is set                                        | SATISFIED | `test_save_on_exit_writes_state_file` PASSES (file exists, serial key present) |
| TEST-02     | 01-01-PLAN  | Test proves no write occurs on exit when `state_file` is `None`                                      | SATISFIED | `test_save_on_exit_no_op_without_state_file` PASSES (tmp_path empty after exit) |
| TEST-03     | 01-01-PLAN  | Test proves body exception propagates and save errors are swallowed                                   | SATISFIED | `test_save_on_exit_body_exception_propagates` PASSES (RuntimeError propagates, WARNING logged) |

**Orphaned requirements check:** REQUIREMENTS.md maps no additional IDs to Phase 1 beyond the seven declared in the PLAN frontmatter. Coverage: 7/7. No orphaned requirements.

### Anti-Patterns Found

| File                              | Line | Pattern                              | Severity | Impact                                                                                                                              |
|-----------------------------------|------|--------------------------------------|----------|-------------------------------------------------------------------------------------------------------------------------------------|
| `src/lifx/devices/ceiling.py`     | 227  | `# pragma: no cover` on `except` clause | Warning  | TEST-03 monkeypatches `_save_state_to_file` to raise `OSError`, which deliberately exercises this branch. The pragma misdocuments the coverage situation and means a future regression silencing the WARNING log would not appear as a coverage drop. Flagged as IN-01 in the code review. Not a functional blocker. |

No TBD, FIXME, or XXX debt markers in any files modified by this phase.

### Human Verification Required

None. All three success criteria are observable through automated tests and static analysis. No phase plan tasks contained `<verify><human-check>` blocks.

### Gaps Summary

No gaps. All four roadmap success criteria are verified against actual codebase evidence. The three tests pass against the embedded emulator, pyright reports 0 errors, ruff is clean, and the regression suite is green except for a pre-existing flaky test unrelated to this phase.

**Code review warnings (WR-01, WR-02, WR-03) from `01-REVIEW.md` are noted for completeness:**
- WR-01 (data destruction on load failure) and WR-03 (non-atomic write) are pre-existing design properties of `_save_state_to_file()` exposed more frequently by the new exit hook. They are quality improvement candidates but do not prevent the phase goal.
- WR-02 (weak TEST-01 assertion — passes even with empty payload) is accurate but the test does prove the write mechanism fired, which satisfies CEIL-01 as stated. A stronger assertion would be a quality improvement.

None of these constitute BLOCKERs. Phase goal is achieved.

---

_Verified: 2026-06-12T07:30:00Z_
_Verifier: Claude (gsd-verifier)_
