FA-34951 / Notification interfaces / Open access
Notification content revision review: ack-revision from revision-two-preview · case 01
The ack-revision event leaves a notification in revision-one-read instead of revision-two-read.
ROOT CAUSE
Acknowledgement commits against the superseded revision.
VERIFIED REPAIR
Commit the revision-two-preview / ack-revision transition to revision-two-read; preserve the other explicitly stipulated transitions.
Unsuccessful approach: Returning unread ignores successful current-revision acknowledgement.
Case contract
Notification content revision review is a bounded visual-notification workflow with mutable policy state {'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False}. Its default transition relation is {('revision-one-read', 'revision-two-arrives'): 'revision-two-unread', ('revision-two-unread', 'open-revision'): 'revision-two-preview', ('revision-two-preview', 'ack-revision'): 'revision-two-read', ('revision-two-preview', 'revision-three-arrives'): 'revision-three-pending-review', ('revision-three-pending-review', 'accept-update'): 'revision-three-preview', ('revision-three-preview', 'ack-revision'): 'revision-three-read', ('revision-three-read', 'late-revision-two'): 'revision-three-read', ('revision-three-pending-review', 'close-preview'): 'revision-three-unread', ('revision-three-unread', 'open-revision'): 'revision-three-preview', ('revision-two-unread', 'revision-withdrawn'): 'withdrawn'}; domain inputs can suppress or redirect transitions and update policy fields, as specified in solve. Different-generation events are inert. Batches apply in order. Optional observe returns the selected policy field alongside the phase.
Why this case matters
Visual notification lifecycle ordering can leave an inbox or toast showing the wrong actionable state even when transport succeeds.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(initial, events, generation, payload=None, observe=None):
table = {('revision-one-read', 'revision-two-arrives'): 'revision-two-unread', ('revision-two-unread', 'open-revision'): 'revision-two-preview', ('revision-two-preview', 'ack-revision'): 'revision-one-read', ('revision-two-preview', 'revision-three-arrives'): 'revision-three-pending-review', ('revision-three-pending-review', 'accept-update'): 'revision-three-preview', ('revision-three-preview', 'ack-revision'): 'revision-three-read', ('revision-three-read', 'late-revision-two'): 'revision-three-read', ('revision-three-pending-review', 'close-preview'): 'revision-three-unread', ('revision-three-unread', 'open-revision'): 'revision-three-preview', ('revision-two-unread', 'revision-withdrawn'): 'withdrawn'}
data = json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})) if payload is None else {**json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})), **json.loads(json.dumps(payload))}
state = initial
for delivery in events:
event, event_generation = delivery[:2]
arg = delivery[2] if len(delivery) > 2 else {}
if event_generation == generation:
previous = state
if event == 'ack-revision' and arg.get('revision',data['current']) != data['current']: event = 'unknown-event'
if event == 'revision-three-arrives': data['current'] = 3
state = table.get((state, event), state)
if state in ('revision-two-preview','revision-three-preview'): data['preview'] = data['current']
if state == 'revision-two-read': data['ack'] = 2
if state == 'revision-three-read': data['ack'] = 3
if state == 'withdrawn':
data['withdrawn'] = True
data['preview'] = None
return {'phase': state, 'value': data[observe]} if observe else state
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('revision-one-read / revision-two-arrives', solve('revision-one-read', [('revision-two-arrives', N)], N), 'revision-two-unread')
check('revision-two-unread / open-revision', solve('revision-two-unread', [('open-revision', N)], N), 'revision-two-preview')
check('revision-two-preview / ack-revision', solve('revision-two-preview', [('ack-revision', N)], N), 'revision-two-read')
check('revision-two-preview / revision-three-arrives', solve('revision-two-preview', [('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('revision-three-pending-review / accept-update', solve('revision-three-pending-review', [('accept-update', N)], N), 'revision-three-preview')
check('revision-three-preview / ack-revision', solve('revision-three-preview', [('ack-revision', N)], N), 'revision-three-read')
check('revision-three-read / late-revision-two', solve('revision-three-read', [('late-revision-two', N)], N), 'revision-three-read')
check('revision-three-pending-review / close-preview', solve('revision-three-pending-review', [('close-preview', N)], N), 'revision-three-unread')
check('revision-three-unread / open-revision', solve('revision-three-unread', [('open-revision', N)], N), 'revision-three-preview')
check('revision-two-unread / revision-withdrawn', solve('revision-two-unread', [('revision-withdrawn', N)], N), 'withdrawn')
check('older notification incarnation', solve('revision-one-read', [('revision-two-arrives', N - 1)], N), 'revision-one-read')
check('future notification incarnation', solve('revision-one-read', [('revision-two-arrives', N + 1)], N), 'revision-one-read')
check('unknown event is inert', solve('revision-one-read', [('unknown-event', N)], N), 'revision-one-read')
check('empty delivery batch', solve('revision-one-read', [], N), 'revision-one-read')
check('N stale deliveries before current delivery', solve('revision-one-read', [('revision-two-arrives', N - 1)] * N + [('revision-two-arrives', N)], N), 'revision-two-unread')
check('trace revision-two-arrives then open-revision', solve('revision-one-read', [('revision-two-arrives', N), ('open-revision', N)], N), 'revision-two-preview')
check('trace revision-two-arrives then revision-withdrawn', solve('revision-one-read', [('revision-two-arrives', N), ('revision-withdrawn', N)], N), 'withdrawn')
check('trace open-revision then ack-revision', solve('revision-two-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-two-read')
check('trace open-revision then revision-three-arrives', solve('revision-two-unread', [('open-revision', N), ('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('trace revision-three-arrives then accept-update', solve('revision-two-preview', [('revision-three-arrives', N), ('accept-update', N)], N), 'revision-three-preview')
check('trace revision-three-arrives then close-preview', solve('revision-two-preview', [('revision-three-arrives', N), ('close-preview', N)], N), 'revision-three-unread')
check('trace accept-update then ack-revision', solve('revision-three-pending-review', [('accept-update', N), ('ack-revision', N)], N), 'revision-three-read')
check('trace ack-revision then late-revision-two', solve('revision-three-preview', [('ack-revision', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace late-revision-two then late-revision-two', solve('revision-three-read', [('late-revision-two', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace close-preview then open-revision', solve('revision-three-pending-review', [('close-preview', N), ('open-revision', N)], N), 'revision-three-preview')
check('trace open-revision then ack-revision', solve('revision-three-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-three-read')
check('domain state regression 1: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 1})], N, {}, 'ack'), {'phase': 'revision-two-preview', 'value': 1})
check('domain state regression 2: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 2})], N, {}, 'ack'), {'phase': 'revision-two-read', 'value': 2})
check('domain state regression 3: preview', solve('revision-two-preview', [('revision-three-arrives', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'revision-three-pending-review', 'value': 2})
check('domain state regression 4: preview', solve('revision-three-pending-review', [('accept-update', N, {})], N, {'current': 3, 'preview': 2}, 'preview'), {'phase': 'revision-three-preview', 'value': 3})
check('domain state regression 5: current', solve('revision-three-read', [('late-revision-two', N, {})], N, {'current': 3, 'ack': 3}, 'current'), {'phase': 'revision-three-read', 'value': 3})
check('domain state regression 6: preview', solve('revision-two-unread', [('revision-withdrawn', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'withdrawn', 'value': None})
check('domain state regression 7: ack', solve('revision-two-preview', [('revision-three-arrives', N, {}), ('accept-update', N, {}), ('ack-revision', N, {'revision': 2}), ('ack-revision', N, {'revision': 3})], N, {}, 'ack'), {'phase': 'revision-three-read', 'value': 3})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| revision-one-read / revision-two-arrives | revision-two-unread | revision-two-unread | Passed |
| revision-two-unread / open-revision | revision-two-preview | revision-two-preview | Passed |
| revision-two-preview / ack-revision | revision-one-read | revision-two-read | Failed |
| revision-two-preview / revision-three-arrives | revision-three-pending-review | revision-three-pending-review | Passed |
| revision-three-pending-review / accept-update | revision-three-preview | revision-three-preview | Passed |
| revision-three-preview / ack-revision | revision-three-read | revision-three-read | Passed |
| revision-three-read / late-revision-two | revision-three-read | revision-three-read | Passed |
| revision-three-pending-review / close-preview | revision-three-unread | revision-three-unread | Passed |
| revision-three-unread / open-revision | revision-three-preview | revision-three-preview | Passed |
| revision-two-unread / revision-withdrawn | withdrawn | withdrawn | Passed |
| older notification incarnation | revision-one-read | revision-one-read | Passed |
| future notification incarnation | revision-one-read | revision-one-read | Passed |
| unknown event is inert | revision-one-read | revision-one-read | Passed |
| empty delivery batch | revision-one-read | revision-one-read | Passed |
| N stale deliveries before current delivery | revision-two-unread | revision-two-unread | Passed |
| trace revision-two-arrives then open-revision | revision-two-preview | revision-two-preview | Passed |
| trace revision-two-arrives then revision-withdrawn | withdrawn | withdrawn | Passed |
| trace open-revision then ack-revision | revision-one-read | revision-two-read | Failed |
| trace open-revision then revision-three-arrives | revision-three-pending-review | revision-three-pending-review | Passed |
| trace revision-three-arrives then accept-update | revision-three-preview | revision-three-preview | Passed |
| trace revision-three-arrives then close-preview | revision-three-unread | revision-three-unread | Passed |
| trace accept-update then ack-revision | revision-three-read | revision-three-read | Passed |
| trace ack-revision then late-revision-two | revision-three-read | revision-three-read | Passed |
| trace late-revision-two then late-revision-two | revision-three-read | revision-three-read | Passed |
| trace close-preview then open-revision | revision-three-preview | revision-three-preview | Passed |
| trace open-revision then ack-revision | revision-three-read | revision-three-read | Passed |
| domain state regression 1: ack | {'phase': 'revision-two-preview', 'value': 1} | {'phase': 'revision-two-preview', 'value': 1} | Passed |
| domain state regression 2: ack | {'phase': 'revision-one-read', 'value': 1} | {'phase': 'revision-two-read', 'value': 2} | Failed |
| domain state regression 3: preview | {'phase': 'revision-three-pending-review', 'value': 2} | {'phase': 'revision-three-pending-review', 'value': 2} | Passed |
| domain state regression 4: preview | {'phase': 'revision-three-preview', 'value': 3} | {'phase': 'revision-three-preview', 'value': 3} | Passed |
| domain state regression 5: current | {'phase': 'revision-three-read', 'value': 3} | {'phase': 'revision-three-read', 'value': 3} | Passed |
| domain state regression 6: preview | {'phase': 'withdrawn', 'value': None} | {'phase': 'withdrawn', 'value': None} | Passed |
| domain state regression 7: ack | {'phase': 'revision-three-read', 'value': 3} | {'phase': 'revision-three-read', 'value': 3} | Passed |
SHA-256 / 4cdb8016e998c5bb911b5479842dd9d0f1a2b0949d622b1c7ca2df2666fcd113
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(initial, events, generation, payload=None, observe=None):
table = {('revision-one-read', 'revision-two-arrives'): 'revision-two-unread', ('revision-two-unread', 'open-revision'): 'revision-two-preview', ('revision-two-preview', 'ack-revision'): 'revision-two-unread', ('revision-two-preview', 'revision-three-arrives'): 'revision-three-pending-review', ('revision-three-pending-review', 'accept-update'): 'revision-three-preview', ('revision-three-preview', 'ack-revision'): 'revision-three-read', ('revision-three-read', 'late-revision-two'): 'revision-three-read', ('revision-three-pending-review', 'close-preview'): 'revision-three-unread', ('revision-three-unread', 'open-revision'): 'revision-three-preview', ('revision-two-unread', 'revision-withdrawn'): 'withdrawn'}
data = json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})) if payload is None else {**json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})), **json.loads(json.dumps(payload))}
state = initial
for delivery in events:
event, event_generation = delivery[:2]
arg = delivery[2] if len(delivery) > 2 else {}
if event_generation == generation:
previous = state
if event == 'ack-revision' and arg.get('revision',data['current']) != data['current']: event = 'unknown-event'
if event == 'revision-three-arrives': data['current'] = 3
state = table.get((state, event), state)
if state in ('revision-two-preview','revision-three-preview'): data['preview'] = data['current']
if state == 'revision-two-read': data['ack'] = 2
if state == 'revision-three-read': data['ack'] = 3
if state == 'withdrawn':
data['withdrawn'] = True
data['preview'] = None
return {'phase': state, 'value': data[observe]} if observe else state
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('revision-one-read / revision-two-arrives', solve('revision-one-read', [('revision-two-arrives', N)], N), 'revision-two-unread')
check('revision-two-unread / open-revision', solve('revision-two-unread', [('open-revision', N)], N), 'revision-two-preview')
check('revision-two-preview / ack-revision', solve('revision-two-preview', [('ack-revision', N)], N), 'revision-two-read')
check('revision-two-preview / revision-three-arrives', solve('revision-two-preview', [('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('revision-three-pending-review / accept-update', solve('revision-three-pending-review', [('accept-update', N)], N), 'revision-three-preview')
check('revision-three-preview / ack-revision', solve('revision-three-preview', [('ack-revision', N)], N), 'revision-three-read')
check('revision-three-read / late-revision-two', solve('revision-three-read', [('late-revision-two', N)], N), 'revision-three-read')
check('revision-three-pending-review / close-preview', solve('revision-three-pending-review', [('close-preview', N)], N), 'revision-three-unread')
check('revision-three-unread / open-revision', solve('revision-three-unread', [('open-revision', N)], N), 'revision-three-preview')
check('revision-two-unread / revision-withdrawn', solve('revision-two-unread', [('revision-withdrawn', N)], N), 'withdrawn')
check('older notification incarnation', solve('revision-one-read', [('revision-two-arrives', N - 1)], N), 'revision-one-read')
check('future notification incarnation', solve('revision-one-read', [('revision-two-arrives', N + 1)], N), 'revision-one-read')
check('unknown event is inert', solve('revision-one-read', [('unknown-event', N)], N), 'revision-one-read')
check('empty delivery batch', solve('revision-one-read', [], N), 'revision-one-read')
check('N stale deliveries before current delivery', solve('revision-one-read', [('revision-two-arrives', N - 1)] * N + [('revision-two-arrives', N)], N), 'revision-two-unread')
check('trace revision-two-arrives then open-revision', solve('revision-one-read', [('revision-two-arrives', N), ('open-revision', N)], N), 'revision-two-preview')
check('trace revision-two-arrives then revision-withdrawn', solve('revision-one-read', [('revision-two-arrives', N), ('revision-withdrawn', N)], N), 'withdrawn')
check('trace open-revision then ack-revision', solve('revision-two-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-two-read')
check('trace open-revision then revision-three-arrives', solve('revision-two-unread', [('open-revision', N), ('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('trace revision-three-arrives then accept-update', solve('revision-two-preview', [('revision-three-arrives', N), ('accept-update', N)], N), 'revision-three-preview')
check('trace revision-three-arrives then close-preview', solve('revision-two-preview', [('revision-three-arrives', N), ('close-preview', N)], N), 'revision-three-unread')
check('trace accept-update then ack-revision', solve('revision-three-pending-review', [('accept-update', N), ('ack-revision', N)], N), 'revision-three-read')
check('trace ack-revision then late-revision-two', solve('revision-three-preview', [('ack-revision', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace late-revision-two then late-revision-two', solve('revision-three-read', [('late-revision-two', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace close-preview then open-revision', solve('revision-three-pending-review', [('close-preview', N), ('open-revision', N)], N), 'revision-three-preview')
check('trace open-revision then ack-revision', solve('revision-three-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-three-read')
check('domain state regression 1: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 1})], N, {}, 'ack'), {'phase': 'revision-two-preview', 'value': 1})
check('domain state regression 2: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 2})], N, {}, 'ack'), {'phase': 'revision-two-read', 'value': 2})
check('domain state regression 3: preview', solve('revision-two-preview', [('revision-three-arrives', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'revision-three-pending-review', 'value': 2})
check('domain state regression 4: preview', solve('revision-three-pending-review', [('accept-update', N, {})], N, {'current': 3, 'preview': 2}, 'preview'), {'phase': 'revision-three-preview', 'value': 3})
check('domain state regression 5: current', solve('revision-three-read', [('late-revision-two', N, {})], N, {'current': 3, 'ack': 3}, 'current'), {'phase': 'revision-three-read', 'value': 3})
check('domain state regression 6: preview', solve('revision-two-unread', [('revision-withdrawn', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'withdrawn', 'value': None})
check('domain state regression 7: ack', solve('revision-two-preview', [('revision-three-arrives', N, {}), ('accept-update', N, {}), ('ack-revision', N, {'revision': 2}), ('ack-revision', N, {'revision': 3})], N, {}, 'ack'), {'phase': 'revision-three-read', 'value': 3})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| revision-one-read / revision-two-arrives | revision-two-unread | revision-two-unread | Passed |
| revision-two-unread / open-revision | revision-two-preview | revision-two-preview | Passed |
| revision-two-preview / ack-revision | revision-two-unread | revision-two-read | Failed |
| revision-two-preview / revision-three-arrives | revision-three-pending-review | revision-three-pending-review | Passed |
| revision-three-pending-review / accept-update | revision-three-preview | revision-three-preview | Passed |
| revision-three-preview / ack-revision | revision-three-read | revision-three-read | Passed |
| revision-three-read / late-revision-two | revision-three-read | revision-three-read | Passed |
| revision-three-pending-review / close-preview | revision-three-unread | revision-three-unread | Passed |
| revision-three-unread / open-revision | revision-three-preview | revision-three-preview | Passed |
| revision-two-unread / revision-withdrawn | withdrawn | withdrawn | Passed |
| older notification incarnation | revision-one-read | revision-one-read | Passed |
| future notification incarnation | revision-one-read | revision-one-read | Passed |
| unknown event is inert | revision-one-read | revision-one-read | Passed |
| empty delivery batch | revision-one-read | revision-one-read | Passed |
| N stale deliveries before current delivery | revision-two-unread | revision-two-unread | Passed |
| trace revision-two-arrives then open-revision | revision-two-preview | revision-two-preview | Passed |
| trace revision-two-arrives then revision-withdrawn | withdrawn | withdrawn | Passed |
| trace open-revision then ack-revision | revision-two-unread | revision-two-read | Failed |
| trace open-revision then revision-three-arrives | revision-three-pending-review | revision-three-pending-review | Passed |
| trace revision-three-arrives then accept-update | revision-three-preview | revision-three-preview | Passed |
| trace revision-three-arrives then close-preview | revision-three-unread | revision-three-unread | Passed |
| trace accept-update then ack-revision | revision-three-read | revision-three-read | Passed |
| trace ack-revision then late-revision-two | revision-three-read | revision-three-read | Passed |
| trace late-revision-two then late-revision-two | revision-three-read | revision-three-read | Passed |
| trace close-preview then open-revision | revision-three-preview | revision-three-preview | Passed |
| trace open-revision then ack-revision | revision-three-read | revision-three-read | Passed |
| domain state regression 1: ack | {'phase': 'revision-two-preview', 'value': 1} | {'phase': 'revision-two-preview', 'value': 1} | Passed |
| domain state regression 2: ack | {'phase': 'revision-two-unread', 'value': 1} | {'phase': 'revision-two-read', 'value': 2} | Failed |
| domain state regression 3: preview | {'phase': 'revision-three-pending-review', 'value': 2} | {'phase': 'revision-three-pending-review', 'value': 2} | Passed |
| domain state regression 4: preview | {'phase': 'revision-three-preview', 'value': 3} | {'phase': 'revision-three-preview', 'value': 3} | Passed |
| domain state regression 5: current | {'phase': 'revision-three-read', 'value': 3} | {'phase': 'revision-three-read', 'value': 3} | Passed |
| domain state regression 6: preview | {'phase': 'withdrawn', 'value': None} | {'phase': 'withdrawn', 'value': None} | Passed |
| domain state regression 7: ack | {'phase': 'revision-three-read', 'value': 3} | {'phase': 'revision-three-read', 'value': 3} | Passed |
SHA-256 / 222cb38531b65981babcb09294b85ff73af368c6d690643873603de66ccad802
3 / The verified repair
Exit 0"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(initial, events, generation, payload=None, observe=None):
table = {('revision-one-read', 'revision-two-arrives'): 'revision-two-unread', ('revision-two-unread', 'open-revision'): 'revision-two-preview', ('revision-two-preview', 'ack-revision'): 'revision-two-read', ('revision-two-preview', 'revision-three-arrives'): 'revision-three-pending-review', ('revision-three-pending-review', 'accept-update'): 'revision-three-preview', ('revision-three-preview', 'ack-revision'): 'revision-three-read', ('revision-three-read', 'late-revision-two'): 'revision-three-read', ('revision-three-pending-review', 'close-preview'): 'revision-three-unread', ('revision-three-unread', 'open-revision'): 'revision-three-preview', ('revision-two-unread', 'revision-withdrawn'): 'withdrawn'}
data = json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})) if payload is None else {**json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})), **json.loads(json.dumps(payload))}
state = initial
for delivery in events:
event, event_generation = delivery[:2]
arg = delivery[2] if len(delivery) > 2 else {}
if event_generation == generation:
previous = state
if event == 'ack-revision' and arg.get('revision',data['current']) != data['current']: event = 'unknown-event'
if event == 'revision-three-arrives': data['current'] = 3
state = table.get((state, event), state)
if state in ('revision-two-preview','revision-three-preview'): data['preview'] = data['current']
if state == 'revision-two-read': data['ack'] = 2
if state == 'revision-three-read': data['ack'] = 3
if state == 'withdrawn':
data['withdrawn'] = True
data['preview'] = None
return {'phase': state, 'value': data[observe]} if observe else state
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('revision-one-read / revision-two-arrives', solve('revision-one-read', [('revision-two-arrives', N)], N), 'revision-two-unread')
check('revision-two-unread / open-revision', solve('revision-two-unread', [('open-revision', N)], N), 'revision-two-preview')
check('revision-two-preview / ack-revision', solve('revision-two-preview', [('ack-revision', N)], N), 'revision-two-read')
check('revision-two-preview / revision-three-arrives', solve('revision-two-preview', [('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('revision-three-pending-review / accept-update', solve('revision-three-pending-review', [('accept-update', N)], N), 'revision-three-preview')
check('revision-three-preview / ack-revision', solve('revision-three-preview', [('ack-revision', N)], N), 'revision-three-read')
check('revision-three-read / late-revision-two', solve('revision-three-read', [('late-revision-two', N)], N), 'revision-three-read')
check('revision-three-pending-review / close-preview', solve('revision-three-pending-review', [('close-preview', N)], N), 'revision-three-unread')
check('revision-three-unread / open-revision', solve('revision-three-unread', [('open-revision', N)], N), 'revision-three-preview')
check('revision-two-unread / revision-withdrawn', solve('revision-two-unread', [('revision-withdrawn', N)], N), 'withdrawn')
check('older notification incarnation', solve('revision-one-read', [('revision-two-arrives', N - 1)], N), 'revision-one-read')
check('future notification incarnation', solve('revision-one-read', [('revision-two-arrives', N + 1)], N), 'revision-one-read')
check('unknown event is inert', solve('revision-one-read', [('unknown-event', N)], N), 'revision-one-read')
check('empty delivery batch', solve('revision-one-read', [], N), 'revision-one-read')
check('N stale deliveries before current delivery', solve('revision-one-read', [('revision-two-arrives', N - 1)] * N + [('revision-two-arrives', N)], N), 'revision-two-unread')
check('trace revision-two-arrives then open-revision', solve('revision-one-read', [('revision-two-arrives', N), ('open-revision', N)], N), 'revision-two-preview')
check('trace revision-two-arrives then revision-withdrawn', solve('revision-one-read', [('revision-two-arrives', N), ('revision-withdrawn', N)], N), 'withdrawn')
check('trace open-revision then ack-revision', solve('revision-two-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-two-read')
check('trace open-revision then revision-three-arrives', solve('revision-two-unread', [('open-revision', N), ('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('trace revision-three-arrives then accept-update', solve('revision-two-preview', [('revision-three-arrives', N), ('accept-update', N)], N), 'revision-three-preview')
check('trace revision-three-arrives then close-preview', solve('revision-two-preview', [('revision-three-arrives', N), ('close-preview', N)], N), 'revision-three-unread')
check('trace accept-update then ack-revision', solve('revision-three-pending-review', [('accept-update', N), ('ack-revision', N)], N), 'revision-three-read')
check('trace ack-revision then late-revision-two', solve('revision-three-preview', [('ack-revision', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace late-revision-two then late-revision-two', solve('revision-three-read', [('late-revision-two', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace close-preview then open-revision', solve('revision-three-pending-review', [('close-preview', N), ('open-revision', N)], N), 'revision-three-preview')
check('trace open-revision then ack-revision', solve('revision-three-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-three-read')
check('domain state regression 1: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 1})], N, {}, 'ack'), {'phase': 'revision-two-preview', 'value': 1})
check('domain state regression 2: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 2})], N, {}, 'ack'), {'phase': 'revision-two-read', 'value': 2})
check('domain state regression 3: preview', solve('revision-two-preview', [('revision-three-arrives', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'revision-three-pending-review', 'value': 2})
check('domain state regression 4: preview', solve('revision-three-pending-review', [('accept-update', N, {})], N, {'current': 3, 'preview': 2}, 'preview'), {'phase': 'revision-three-preview', 'value': 3})
check('domain state regression 5: current', solve('revision-three-read', [('late-revision-two', N, {})], N, {'current': 3, 'ack': 3}, 'current'), {'phase': 'revision-three-read', 'value': 3})
check('domain state regression 6: preview', solve('revision-two-unread', [('revision-withdrawn', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'withdrawn', 'value': None})
check('domain state regression 7: ack', solve('revision-two-preview', [('revision-three-arrives', N, {}), ('accept-update', N, {}), ('ack-revision', N, {'revision': 2}), ('ack-revision', N, {'revision': 3})], N, {}, 'ack'), {'phase': 'revision-three-read', 'value': 3})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| revision-one-read / revision-two-arrives | revision-two-unread | revision-two-unread | Passed |
| revision-two-unread / open-revision | revision-two-preview | revision-two-preview | Passed |
| revision-two-preview / ack-revision | revision-two-read | revision-two-read | Passed |
| revision-two-preview / revision-three-arrives | revision-three-pending-review | revision-three-pending-review | Passed |
| revision-three-pending-review / accept-update | revision-three-preview | revision-three-preview | Passed |
| revision-three-preview / ack-revision | revision-three-read | revision-three-read | Passed |
| revision-three-read / late-revision-two | revision-three-read | revision-three-read | Passed |
| revision-three-pending-review / close-preview | revision-three-unread | revision-three-unread | Passed |
| revision-three-unread / open-revision | revision-three-preview | revision-three-preview | Passed |
| revision-two-unread / revision-withdrawn | withdrawn | withdrawn | Passed |
| older notification incarnation | revision-one-read | revision-one-read | Passed |
| future notification incarnation | revision-one-read | revision-one-read | Passed |
| unknown event is inert | revision-one-read | revision-one-read | Passed |
| empty delivery batch | revision-one-read | revision-one-read | Passed |
| N stale deliveries before current delivery | revision-two-unread | revision-two-unread | Passed |
| trace revision-two-arrives then open-revision | revision-two-preview | revision-two-preview | Passed |
| trace revision-two-arrives then revision-withdrawn | withdrawn | withdrawn | Passed |
| trace open-revision then ack-revision | revision-two-read | revision-two-read | Passed |
| trace open-revision then revision-three-arrives | revision-three-pending-review | revision-three-pending-review | Passed |
| trace revision-three-arrives then accept-update | revision-three-preview | revision-three-preview | Passed |
| trace revision-three-arrives then close-preview | revision-three-unread | revision-three-unread | Passed |
| trace accept-update then ack-revision | revision-three-read | revision-three-read | Passed |
| trace ack-revision then late-revision-two | revision-three-read | revision-three-read | Passed |
| trace late-revision-two then late-revision-two | revision-three-read | revision-three-read | Passed |
| trace close-preview then open-revision | revision-three-preview | revision-three-preview | Passed |
| trace open-revision then ack-revision | revision-three-read | revision-three-read | Passed |
| domain state regression 1: ack | {'phase': 'revision-two-preview', 'value': 1} | {'phase': 'revision-two-preview', 'value': 1} | Passed |
| domain state regression 2: ack | {'phase': 'revision-two-read', 'value': 2} | {'phase': 'revision-two-read', 'value': 2} | Passed |
| domain state regression 3: preview | {'phase': 'revision-three-pending-review', 'value': 2} | {'phase': 'revision-three-pending-review', 'value': 2} | Passed |
| domain state regression 4: preview | {'phase': 'revision-three-preview', 'value': 3} | {'phase': 'revision-three-preview', 'value': 3} | Passed |
| domain state regression 5: current | {'phase': 'revision-three-read', 'value': 3} | {'phase': 'revision-three-read', 'value': 3} | Passed |
| domain state regression 6: preview | {'phase': 'withdrawn', 'value': None} | {'phase': 'withdrawn', 'value': None} | Passed |
| domain state regression 7: ack | {'phase': 'revision-three-read', 'value': 3} | {'phase': 'revision-three-read', 'value': 3} | Passed |
SHA-256 / 105cd701d9e0d3cef3711b1f96b777ab493651494f0e6e0111aace730fa9baa5
Verification & scope
Stipulated single-notification state and policy model only. Event delivery and acknowledgements are explicit test inputs. No DOM, accessibility announcements, live timers, networking, actual rendering, or production-platform conformance is simulated. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.
Observations recorded using Python 3.12.14 at 2026-09-29T14:42:36.878914+00:00.
Case digest / efe2d90a113fa9dca069ab57b4d283de5b6da144d2cd92e5a1a7ee979d8d0708