FA-34821 / Notification interfaces / Open access
Inbox notification pin persistence: cancel-pin-intent from pin-error · case 01
The cancel-pin-intent event leaves a notification in pinned instead of unpinned.
ROOT CAUSE
Canceling a failed pin still shows it pinned.
VERIFIED REPAIR
Commit the pin-error / cancel-pin-intent transition to unpinned; preserve the other explicitly stipulated transitions.
Unsuccessful approach: Retrying on cancel violates the user's changed intent.
Case contract
Inbox notification pin persistence is a bounded visual-notification workflow with mutable policy state {'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True}. Its default transition relation is {('unpinned', 'pin-click'): 'pin-pending', ('pin-pending', 'pin-success'): 'pinned', ('pin-pending', 'pin-failure'): 'pin-error', ('pinned', 'unpin-click'): 'unpin-pending', ('unpin-pending', 'unpin-success'): 'unpinned', ('unpin-pending', 'unpin-failure'): 'unpin-error', ('pin-error', 'cancel-pin-intent'): 'unpinned', ('unpin-error', 'cancel-unpin-intent'): 'pinned', ('pinned', 'notification-expires'): 'expired-pinned', ('expired-pinned', 'unpin-expired'): 'gone'}; 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 = {('unpinned', 'pin-click'): 'pin-pending', ('pin-pending', 'pin-success'): 'pinned', ('pin-pending', 'pin-failure'): 'pin-error', ('pinned', 'unpin-click'): 'unpin-pending', ('unpin-pending', 'unpin-success'): 'unpinned', ('unpin-pending', 'unpin-failure'): 'unpin-error', ('pin-error', 'cancel-pin-intent'): 'pinned', ('unpin-error', 'cancel-unpin-intent'): 'pinned', ('pinned', 'notification-expires'): 'expired-pinned', ('expired-pinned', 'unpin-expired'): 'gone'}
data = json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})) if payload is None else {**json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})), **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 == 'pin-click' and data['item'] not in data['pinned'] and len(data['pinned']) >= data['capacity']: event = 'unknown-event'
if event == 'notification-expires': data['expired'] = True
state = table.get((state, event), state)
if state in ('pinned','expired-pinned') and data['item'] not in data['pinned']: data['pinned'].append(data['item'])
if state in ('unpinned','gone'): data['pinned'] = [x for x in data['pinned'] if x != data['item']]
if state == 'gone': data['retained'] = False
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('unpinned / pin-click', solve('unpinned', [('pin-click', N)], N), 'pin-pending')
check('pin-pending / pin-success', solve('pin-pending', [('pin-success', N)], N), 'pinned')
check('pin-pending / pin-failure', solve('pin-pending', [('pin-failure', N)], N), 'pin-error')
check('pinned / unpin-click', solve('pinned', [('unpin-click', N)], N), 'unpin-pending')
check('unpin-pending / unpin-success', solve('unpin-pending', [('unpin-success', N)], N), 'unpinned')
check('unpin-pending / unpin-failure', solve('unpin-pending', [('unpin-failure', N)], N), 'unpin-error')
check('pin-error / cancel-pin-intent', solve('pin-error', [('cancel-pin-intent', N)], N), 'unpinned')
check('unpin-error / cancel-unpin-intent', solve('unpin-error', [('cancel-unpin-intent', N)], N), 'pinned')
check('pinned / notification-expires', solve('pinned', [('notification-expires', N)], N), 'expired-pinned')
check('expired-pinned / unpin-expired', solve('expired-pinned', [('unpin-expired', N)], N), 'gone')
check('older notification incarnation', solve('unpinned', [('pin-click', N - 1)], N), 'unpinned')
check('future notification incarnation', solve('unpinned', [('pin-click', N + 1)], N), 'unpinned')
check('unknown event is inert', solve('unpinned', [('unknown-event', N)], N), 'unpinned')
check('empty delivery batch', solve('unpinned', [], N), 'unpinned')
check('N stale deliveries before current delivery', solve('unpinned', [('pin-click', N - 1)] * N + [('pin-click', N)], N), 'pin-pending')
check('trace pin-click then pin-success', solve('unpinned', [('pin-click', N), ('pin-success', N)], N), 'pinned')
check('trace pin-click then pin-failure', solve('unpinned', [('pin-click', N), ('pin-failure', N)], N), 'pin-error')
check('trace pin-success then unpin-click', solve('pin-pending', [('pin-success', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace pin-success then notification-expires', solve('pin-pending', [('pin-success', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace pin-failure then cancel-pin-intent', solve('pin-pending', [('pin-failure', N), ('cancel-pin-intent', N)], N), 'unpinned')
check('trace unpin-click then unpin-success', solve('pinned', [('unpin-click', N), ('unpin-success', N)], N), 'unpinned')
check('trace unpin-click then unpin-failure', solve('pinned', [('unpin-click', N), ('unpin-failure', N)], N), 'unpin-error')
check('trace unpin-success then pin-click', solve('unpin-pending', [('unpin-success', N), ('pin-click', N)], N), 'pin-pending')
check('trace unpin-failure then cancel-unpin-intent', solve('unpin-pending', [('unpin-failure', N), ('cancel-unpin-intent', N)], N), 'pinned')
check('trace cancel-pin-intent then pin-click', solve('pin-error', [('cancel-pin-intent', N), ('pin-click', N)], N), 'pin-pending')
check('trace cancel-unpin-intent then unpin-click', solve('unpin-error', [('cancel-unpin-intent', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace cancel-unpin-intent then notification-expires', solve('unpin-error', [('cancel-unpin-intent', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace notification-expires then unpin-expired', solve('pinned', [('notification-expires', N), ('unpin-expired', N)], N), 'gone')
check('domain state regression 1: pinned', solve('unpinned', [('pin-click', N, {})], N, {'capacity': 1}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 2: pinned', solve('pin-pending', [('pin-success', N, {})], N, {}, 'pinned'), {'phase': 'pinned', 'value': ['other', 'n']})
check('domain state regression 3: pinned', solve('unpin-pending', [('unpin-success', N, {})], N, {'pinned': ['n', 'other']}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 4: retained', solve('pinned', [('notification-expires', N, {})], N, {'pinned': ['n']}, 'retained'), {'phase': 'expired-pinned', 'value': True})
check('domain state regression 5: pinned', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n', 'other'], 'expired': True}, 'pinned'), {'phase': 'gone', 'value': ['other']})
check('domain state regression 6: retained', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n'], 'expired': True}, 'retained'), {'phase': 'gone', 'value': False})
check('domain state regression 7: pinned', solve('unpinned', [('pin-click', N, {}), ('pin-success', N, {}), ('notification-expires', N, {}), ('unpin-expired', N, {})], N, {}, 'pinned'), {'phase': 'gone', 'value': ['other']})
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 |
|---|---|---|---|
| unpinned / pin-click | pin-pending | pin-pending | Passed |
| pin-pending / pin-success | pinned | pinned | Passed |
| pin-pending / pin-failure | pin-error | pin-error | Passed |
| pinned / unpin-click | unpin-pending | unpin-pending | Passed |
| unpin-pending / unpin-success | unpinned | unpinned | Passed |
| unpin-pending / unpin-failure | unpin-error | unpin-error | Passed |
| pin-error / cancel-pin-intent | pinned | unpinned | Failed |
| unpin-error / cancel-unpin-intent | pinned | pinned | Passed |
| pinned / notification-expires | expired-pinned | expired-pinned | Passed |
| expired-pinned / unpin-expired | gone | gone | Passed |
| older notification incarnation | unpinned | unpinned | Passed |
| future notification incarnation | unpinned | unpinned | Passed |
| unknown event is inert | unpinned | unpinned | Passed |
| empty delivery batch | unpinned | unpinned | Passed |
| N stale deliveries before current delivery | pin-pending | pin-pending | Passed |
| trace pin-click then pin-success | pinned | pinned | Passed |
| trace pin-click then pin-failure | pin-error | pin-error | Passed |
| trace pin-success then unpin-click | unpin-pending | unpin-pending | Passed |
| trace pin-success then notification-expires | expired-pinned | expired-pinned | Passed |
| trace pin-failure then cancel-pin-intent | pinned | unpinned | Failed |
| trace unpin-click then unpin-success | unpinned | unpinned | Passed |
| trace unpin-click then unpin-failure | unpin-error | unpin-error | Passed |
| trace unpin-success then pin-click | pin-pending | pin-pending | Passed |
| trace unpin-failure then cancel-unpin-intent | pinned | pinned | Passed |
| trace cancel-pin-intent then pin-click | pinned | pin-pending | Failed |
| trace cancel-unpin-intent then unpin-click | unpin-pending | unpin-pending | Passed |
| trace cancel-unpin-intent then notification-expires | expired-pinned | expired-pinned | Passed |
| trace notification-expires then unpin-expired | gone | gone | Passed |
| domain state regression 1: pinned | {'phase': 'unpinned', 'value': ['other']} | {'phase': 'unpinned', 'value': ['other']} | Passed |
| domain state regression 2: pinned | {'phase': 'pinned', 'value': ['other', 'n']} | {'phase': 'pinned', 'value': ['other', 'n']} | Passed |
| domain state regression 3: pinned | {'phase': 'unpinned', 'value': ['other']} | {'phase': 'unpinned', 'value': ['other']} | Passed |
| domain state regression 4: retained | {'phase': 'expired-pinned', 'value': True} | {'phase': 'expired-pinned', 'value': True} | Passed |
| domain state regression 5: pinned | {'phase': 'gone', 'value': ['other']} | {'phase': 'gone', 'value': ['other']} | Passed |
| domain state regression 6: retained | {'phase': 'gone', 'value': False} | {'phase': 'gone', 'value': False} | Passed |
| domain state regression 7: pinned | {'phase': 'gone', 'value': ['other']} | {'phase': 'gone', 'value': ['other']} | Passed |
SHA-256 / 0de26992e3078607e842b373c9f95e106896420698a7d0c8d3161edd42580313
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 = {('unpinned', 'pin-click'): 'pin-pending', ('pin-pending', 'pin-success'): 'pinned', ('pin-pending', 'pin-failure'): 'pin-error', ('pinned', 'unpin-click'): 'unpin-pending', ('unpin-pending', 'unpin-success'): 'unpinned', ('unpin-pending', 'unpin-failure'): 'unpin-error', ('pin-error', 'cancel-pin-intent'): 'pin-pending', ('unpin-error', 'cancel-unpin-intent'): 'pinned', ('pinned', 'notification-expires'): 'expired-pinned', ('expired-pinned', 'unpin-expired'): 'gone'}
data = json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})) if payload is None else {**json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})), **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 == 'pin-click' and data['item'] not in data['pinned'] and len(data['pinned']) >= data['capacity']: event = 'unknown-event'
if event == 'notification-expires': data['expired'] = True
state = table.get((state, event), state)
if state in ('pinned','expired-pinned') and data['item'] not in data['pinned']: data['pinned'].append(data['item'])
if state in ('unpinned','gone'): data['pinned'] = [x for x in data['pinned'] if x != data['item']]
if state == 'gone': data['retained'] = False
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('unpinned / pin-click', solve('unpinned', [('pin-click', N)], N), 'pin-pending')
check('pin-pending / pin-success', solve('pin-pending', [('pin-success', N)], N), 'pinned')
check('pin-pending / pin-failure', solve('pin-pending', [('pin-failure', N)], N), 'pin-error')
check('pinned / unpin-click', solve('pinned', [('unpin-click', N)], N), 'unpin-pending')
check('unpin-pending / unpin-success', solve('unpin-pending', [('unpin-success', N)], N), 'unpinned')
check('unpin-pending / unpin-failure', solve('unpin-pending', [('unpin-failure', N)], N), 'unpin-error')
check('pin-error / cancel-pin-intent', solve('pin-error', [('cancel-pin-intent', N)], N), 'unpinned')
check('unpin-error / cancel-unpin-intent', solve('unpin-error', [('cancel-unpin-intent', N)], N), 'pinned')
check('pinned / notification-expires', solve('pinned', [('notification-expires', N)], N), 'expired-pinned')
check('expired-pinned / unpin-expired', solve('expired-pinned', [('unpin-expired', N)], N), 'gone')
check('older notification incarnation', solve('unpinned', [('pin-click', N - 1)], N), 'unpinned')
check('future notification incarnation', solve('unpinned', [('pin-click', N + 1)], N), 'unpinned')
check('unknown event is inert', solve('unpinned', [('unknown-event', N)], N), 'unpinned')
check('empty delivery batch', solve('unpinned', [], N), 'unpinned')
check('N stale deliveries before current delivery', solve('unpinned', [('pin-click', N - 1)] * N + [('pin-click', N)], N), 'pin-pending')
check('trace pin-click then pin-success', solve('unpinned', [('pin-click', N), ('pin-success', N)], N), 'pinned')
check('trace pin-click then pin-failure', solve('unpinned', [('pin-click', N), ('pin-failure', N)], N), 'pin-error')
check('trace pin-success then unpin-click', solve('pin-pending', [('pin-success', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace pin-success then notification-expires', solve('pin-pending', [('pin-success', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace pin-failure then cancel-pin-intent', solve('pin-pending', [('pin-failure', N), ('cancel-pin-intent', N)], N), 'unpinned')
check('trace unpin-click then unpin-success', solve('pinned', [('unpin-click', N), ('unpin-success', N)], N), 'unpinned')
check('trace unpin-click then unpin-failure', solve('pinned', [('unpin-click', N), ('unpin-failure', N)], N), 'unpin-error')
check('trace unpin-success then pin-click', solve('unpin-pending', [('unpin-success', N), ('pin-click', N)], N), 'pin-pending')
check('trace unpin-failure then cancel-unpin-intent', solve('unpin-pending', [('unpin-failure', N), ('cancel-unpin-intent', N)], N), 'pinned')
check('trace cancel-pin-intent then pin-click', solve('pin-error', [('cancel-pin-intent', N), ('pin-click', N)], N), 'pin-pending')
check('trace cancel-unpin-intent then unpin-click', solve('unpin-error', [('cancel-unpin-intent', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace cancel-unpin-intent then notification-expires', solve('unpin-error', [('cancel-unpin-intent', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace notification-expires then unpin-expired', solve('pinned', [('notification-expires', N), ('unpin-expired', N)], N), 'gone')
check('domain state regression 1: pinned', solve('unpinned', [('pin-click', N, {})], N, {'capacity': 1}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 2: pinned', solve('pin-pending', [('pin-success', N, {})], N, {}, 'pinned'), {'phase': 'pinned', 'value': ['other', 'n']})
check('domain state regression 3: pinned', solve('unpin-pending', [('unpin-success', N, {})], N, {'pinned': ['n', 'other']}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 4: retained', solve('pinned', [('notification-expires', N, {})], N, {'pinned': ['n']}, 'retained'), {'phase': 'expired-pinned', 'value': True})
check('domain state regression 5: pinned', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n', 'other'], 'expired': True}, 'pinned'), {'phase': 'gone', 'value': ['other']})
check('domain state regression 6: retained', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n'], 'expired': True}, 'retained'), {'phase': 'gone', 'value': False})
check('domain state regression 7: pinned', solve('unpinned', [('pin-click', N, {}), ('pin-success', N, {}), ('notification-expires', N, {}), ('unpin-expired', N, {})], N, {}, 'pinned'), {'phase': 'gone', 'value': ['other']})
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 |
|---|---|---|---|
| unpinned / pin-click | pin-pending | pin-pending | Passed |
| pin-pending / pin-success | pinned | pinned | Passed |
| pin-pending / pin-failure | pin-error | pin-error | Passed |
| pinned / unpin-click | unpin-pending | unpin-pending | Passed |
| unpin-pending / unpin-success | unpinned | unpinned | Passed |
| unpin-pending / unpin-failure | unpin-error | unpin-error | Passed |
| pin-error / cancel-pin-intent | pin-pending | unpinned | Failed |
| unpin-error / cancel-unpin-intent | pinned | pinned | Passed |
| pinned / notification-expires | expired-pinned | expired-pinned | Passed |
| expired-pinned / unpin-expired | gone | gone | Passed |
| older notification incarnation | unpinned | unpinned | Passed |
| future notification incarnation | unpinned | unpinned | Passed |
| unknown event is inert | unpinned | unpinned | Passed |
| empty delivery batch | unpinned | unpinned | Passed |
| N stale deliveries before current delivery | pin-pending | pin-pending | Passed |
| trace pin-click then pin-success | pinned | pinned | Passed |
| trace pin-click then pin-failure | pin-error | pin-error | Passed |
| trace pin-success then unpin-click | unpin-pending | unpin-pending | Passed |
| trace pin-success then notification-expires | expired-pinned | expired-pinned | Passed |
| trace pin-failure then cancel-pin-intent | pin-pending | unpinned | Failed |
| trace unpin-click then unpin-success | unpinned | unpinned | Passed |
| trace unpin-click then unpin-failure | unpin-error | unpin-error | Passed |
| trace unpin-success then pin-click | pin-pending | pin-pending | Passed |
| trace unpin-failure then cancel-unpin-intent | pinned | pinned | Passed |
| trace cancel-pin-intent then pin-click | pin-pending | pin-pending | Passed |
| trace cancel-unpin-intent then unpin-click | unpin-pending | unpin-pending | Passed |
| trace cancel-unpin-intent then notification-expires | expired-pinned | expired-pinned | Passed |
| trace notification-expires then unpin-expired | gone | gone | Passed |
| domain state regression 1: pinned | {'phase': 'unpinned', 'value': ['other']} | {'phase': 'unpinned', 'value': ['other']} | Passed |
| domain state regression 2: pinned | {'phase': 'pinned', 'value': ['other', 'n']} | {'phase': 'pinned', 'value': ['other', 'n']} | Passed |
| domain state regression 3: pinned | {'phase': 'unpinned', 'value': ['other']} | {'phase': 'unpinned', 'value': ['other']} | Passed |
| domain state regression 4: retained | {'phase': 'expired-pinned', 'value': True} | {'phase': 'expired-pinned', 'value': True} | Passed |
| domain state regression 5: pinned | {'phase': 'gone', 'value': ['other']} | {'phase': 'gone', 'value': ['other']} | Passed |
| domain state regression 6: retained | {'phase': 'gone', 'value': False} | {'phase': 'gone', 'value': False} | Passed |
| domain state regression 7: pinned | {'phase': 'gone', 'value': ['other']} | {'phase': 'gone', 'value': ['other']} | Passed |
SHA-256 / 332e1dc326ad4a8a1673083fc0ca6b1c0021c6f22c7517a6abc20806d34f5977
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 = {('unpinned', 'pin-click'): 'pin-pending', ('pin-pending', 'pin-success'): 'pinned', ('pin-pending', 'pin-failure'): 'pin-error', ('pinned', 'unpin-click'): 'unpin-pending', ('unpin-pending', 'unpin-success'): 'unpinned', ('unpin-pending', 'unpin-failure'): 'unpin-error', ('pin-error', 'cancel-pin-intent'): 'unpinned', ('unpin-error', 'cancel-unpin-intent'): 'pinned', ('pinned', 'notification-expires'): 'expired-pinned', ('expired-pinned', 'unpin-expired'): 'gone'}
data = json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})) if payload is None else {**json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})), **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 == 'pin-click' and data['item'] not in data['pinned'] and len(data['pinned']) >= data['capacity']: event = 'unknown-event'
if event == 'notification-expires': data['expired'] = True
state = table.get((state, event), state)
if state in ('pinned','expired-pinned') and data['item'] not in data['pinned']: data['pinned'].append(data['item'])
if state in ('unpinned','gone'): data['pinned'] = [x for x in data['pinned'] if x != data['item']]
if state == 'gone': data['retained'] = False
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('unpinned / pin-click', solve('unpinned', [('pin-click', N)], N), 'pin-pending')
check('pin-pending / pin-success', solve('pin-pending', [('pin-success', N)], N), 'pinned')
check('pin-pending / pin-failure', solve('pin-pending', [('pin-failure', N)], N), 'pin-error')
check('pinned / unpin-click', solve('pinned', [('unpin-click', N)], N), 'unpin-pending')
check('unpin-pending / unpin-success', solve('unpin-pending', [('unpin-success', N)], N), 'unpinned')
check('unpin-pending / unpin-failure', solve('unpin-pending', [('unpin-failure', N)], N), 'unpin-error')
check('pin-error / cancel-pin-intent', solve('pin-error', [('cancel-pin-intent', N)], N), 'unpinned')
check('unpin-error / cancel-unpin-intent', solve('unpin-error', [('cancel-unpin-intent', N)], N), 'pinned')
check('pinned / notification-expires', solve('pinned', [('notification-expires', N)], N), 'expired-pinned')
check('expired-pinned / unpin-expired', solve('expired-pinned', [('unpin-expired', N)], N), 'gone')
check('older notification incarnation', solve('unpinned', [('pin-click', N - 1)], N), 'unpinned')
check('future notification incarnation', solve('unpinned', [('pin-click', N + 1)], N), 'unpinned')
check('unknown event is inert', solve('unpinned', [('unknown-event', N)], N), 'unpinned')
check('empty delivery batch', solve('unpinned', [], N), 'unpinned')
check('N stale deliveries before current delivery', solve('unpinned', [('pin-click', N - 1)] * N + [('pin-click', N)], N), 'pin-pending')
check('trace pin-click then pin-success', solve('unpinned', [('pin-click', N), ('pin-success', N)], N), 'pinned')
check('trace pin-click then pin-failure', solve('unpinned', [('pin-click', N), ('pin-failure', N)], N), 'pin-error')
check('trace pin-success then unpin-click', solve('pin-pending', [('pin-success', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace pin-success then notification-expires', solve('pin-pending', [('pin-success', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace pin-failure then cancel-pin-intent', solve('pin-pending', [('pin-failure', N), ('cancel-pin-intent', N)], N), 'unpinned')
check('trace unpin-click then unpin-success', solve('pinned', [('unpin-click', N), ('unpin-success', N)], N), 'unpinned')
check('trace unpin-click then unpin-failure', solve('pinned', [('unpin-click', N), ('unpin-failure', N)], N), 'unpin-error')
check('trace unpin-success then pin-click', solve('unpin-pending', [('unpin-success', N), ('pin-click', N)], N), 'pin-pending')
check('trace unpin-failure then cancel-unpin-intent', solve('unpin-pending', [('unpin-failure', N), ('cancel-unpin-intent', N)], N), 'pinned')
check('trace cancel-pin-intent then pin-click', solve('pin-error', [('cancel-pin-intent', N), ('pin-click', N)], N), 'pin-pending')
check('trace cancel-unpin-intent then unpin-click', solve('unpin-error', [('cancel-unpin-intent', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace cancel-unpin-intent then notification-expires', solve('unpin-error', [('cancel-unpin-intent', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace notification-expires then unpin-expired', solve('pinned', [('notification-expires', N), ('unpin-expired', N)], N), 'gone')
check('domain state regression 1: pinned', solve('unpinned', [('pin-click', N, {})], N, {'capacity': 1}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 2: pinned', solve('pin-pending', [('pin-success', N, {})], N, {}, 'pinned'), {'phase': 'pinned', 'value': ['other', 'n']})
check('domain state regression 3: pinned', solve('unpin-pending', [('unpin-success', N, {})], N, {'pinned': ['n', 'other']}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 4: retained', solve('pinned', [('notification-expires', N, {})], N, {'pinned': ['n']}, 'retained'), {'phase': 'expired-pinned', 'value': True})
check('domain state regression 5: pinned', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n', 'other'], 'expired': True}, 'pinned'), {'phase': 'gone', 'value': ['other']})
check('domain state regression 6: retained', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n'], 'expired': True}, 'retained'), {'phase': 'gone', 'value': False})
check('domain state regression 7: pinned', solve('unpinned', [('pin-click', N, {}), ('pin-success', N, {}), ('notification-expires', N, {}), ('unpin-expired', N, {})], N, {}, 'pinned'), {'phase': 'gone', 'value': ['other']})
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 |
|---|---|---|---|
| unpinned / pin-click | pin-pending | pin-pending | Passed |
| pin-pending / pin-success | pinned | pinned | Passed |
| pin-pending / pin-failure | pin-error | pin-error | Passed |
| pinned / unpin-click | unpin-pending | unpin-pending | Passed |
| unpin-pending / unpin-success | unpinned | unpinned | Passed |
| unpin-pending / unpin-failure | unpin-error | unpin-error | Passed |
| pin-error / cancel-pin-intent | unpinned | unpinned | Passed |
| unpin-error / cancel-unpin-intent | pinned | pinned | Passed |
| pinned / notification-expires | expired-pinned | expired-pinned | Passed |
| expired-pinned / unpin-expired | gone | gone | Passed |
| older notification incarnation | unpinned | unpinned | Passed |
| future notification incarnation | unpinned | unpinned | Passed |
| unknown event is inert | unpinned | unpinned | Passed |
| empty delivery batch | unpinned | unpinned | Passed |
| N stale deliveries before current delivery | pin-pending | pin-pending | Passed |
| trace pin-click then pin-success | pinned | pinned | Passed |
| trace pin-click then pin-failure | pin-error | pin-error | Passed |
| trace pin-success then unpin-click | unpin-pending | unpin-pending | Passed |
| trace pin-success then notification-expires | expired-pinned | expired-pinned | Passed |
| trace pin-failure then cancel-pin-intent | unpinned | unpinned | Passed |
| trace unpin-click then unpin-success | unpinned | unpinned | Passed |
| trace unpin-click then unpin-failure | unpin-error | unpin-error | Passed |
| trace unpin-success then pin-click | pin-pending | pin-pending | Passed |
| trace unpin-failure then cancel-unpin-intent | pinned | pinned | Passed |
| trace cancel-pin-intent then pin-click | pin-pending | pin-pending | Passed |
| trace cancel-unpin-intent then unpin-click | unpin-pending | unpin-pending | Passed |
| trace cancel-unpin-intent then notification-expires | expired-pinned | expired-pinned | Passed |
| trace notification-expires then unpin-expired | gone | gone | Passed |
| domain state regression 1: pinned | {'phase': 'unpinned', 'value': ['other']} | {'phase': 'unpinned', 'value': ['other']} | Passed |
| domain state regression 2: pinned | {'phase': 'pinned', 'value': ['other', 'n']} | {'phase': 'pinned', 'value': ['other', 'n']} | Passed |
| domain state regression 3: pinned | {'phase': 'unpinned', 'value': ['other']} | {'phase': 'unpinned', 'value': ['other']} | Passed |
| domain state regression 4: retained | {'phase': 'expired-pinned', 'value': True} | {'phase': 'expired-pinned', 'value': True} | Passed |
| domain state regression 5: pinned | {'phase': 'gone', 'value': ['other']} | {'phase': 'gone', 'value': ['other']} | Passed |
| domain state regression 6: retained | {'phase': 'gone', 'value': False} | {'phase': 'gone', 'value': False} | Passed |
| domain state regression 7: pinned | {'phase': 'gone', 'value': ['other']} | {'phase': 'gone', 'value': ['other']} | Passed |
SHA-256 / e6c097a72a3eb4cc0b0594f693c940370d56e15871231e500fbfbc09d70f2632
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 2026-09-29T14:42:35.631933+00:00.
Case digest / 01529e11e35d98360b49b5251266e480e28e6da20da3ae03b07b768d77293ffa