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FA-39626 / Tree accessibility / Open access

Tree accessibility snapshot consistency audit: Selection audit misses absent or nonselectable row · case 01

Selection audit misses absent or nonselectable row produces the wrong hierarchical widget state in a regression fixture.

Verified by executionVariant 1 · 14 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The tree-metadata-audit contract is violated at `x not in table or not table[x]['selectable']` by replacing it with `x not in table`.

THE FAILURE

The tree-metadata-audit contract is violated at `x not in table or not table[x]['selectable']` by replacing it with `x not in table`.

Unsuccessful approach: The partial repair `x in table and not table[x]['selectable']` still violates a boundary or preservation case.

Case contract

Validate a bounded already-resolved widget snapshot. IDs are unique; each row has positive level, positive position no greater than a known set size, a live parent at prior level, leaves omit expansion, and the single active ID must be exposed. Selected IDs must be selectable; busy leaf rows are invalid. Return ordered error codes.

Why this case matters

Offline executable model of a hierarchical accessibility interaction; inputs are bounded and valid as stipulated. No browser, assistive technology, or normative ARIA conformance is claimed.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(d):
    errors=[]; rows=d['rows']; ids=[r['id'] for r in rows]; table={r['id']:r for r in rows}
    if len(ids)!=len(set(ids)): errors.append('duplicate-id')
    if any(r['level']<1 for r in rows): errors.append('invalid-level')
    if any(r['pos']<1 or (r['size']!=-1 and r['pos']>r['size']) for r in rows): errors.append('invalid-position')
    if any(r['parent'] is not None and r['parent'] not in table for r in rows): errors.append('missing-parent')
    if any(r['parent'] in table and r['level']!=table[r['parent']]['level']+1 for r in rows): errors.append('parent-level')
    if any(not r['branch'] and r['expanded'] is not None for r in rows): errors.append('leaf-expanded')
    if d['active'] is not None and d['active'] not in ids: errors.append('missing-active')
    if any(x not in table for x in d['selected']): errors.append('invalid-selection')
    if any(r['busy'] and not r['branch'] for r in rows): errors.append('busy-leaf')
    if any(r['parent'] is None and r['level']!=1 for r in rows): errors.append('root-level')
    return errors
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 2: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 6, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 3: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 7, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 4: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 8, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 5: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 9, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])]}
for label, data, expected in cases[N]:
    check(label, solve(data), expected)
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 fixtureActualExpectedOutcome
valid[][]Passed
duplicate['duplicate-id', 'parent-level']['duplicate-id', 'parent-level']Passed
zero level['invalid-level', 'parent-level']['invalid-level', 'parent-level']Passed
zero position['invalid-position']['invalid-position']Passed
position overflow['invalid-position']['invalid-position']Passed
unknown size[][]Passed
orphan['missing-parent']['missing-parent']Passed
level jump['parent-level']['parent-level']Passed
leaf expanded false['leaf-expanded']['leaf-expanded']Passed
missing active['missing-active']['missing-active']Passed
protected selection[]['invalid-selection']Failed
missing selection['invalid-selection']['invalid-selection']Passed
busy leaf['busy-leaf']['busy-leaf']Passed
indented root['root-level']['root-level']Passed

SHA-256 / 03d23a5112ae65cba9e102519d79fc3ddeb3e6e605888c0a658c6df6ba3074d5

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(d):
    errors=[]; rows=d['rows']; ids=[r['id'] for r in rows]; table={r['id']:r for r in rows}
    if len(ids)!=len(set(ids)): errors.append('duplicate-id')
    if any(r['level']<1 for r in rows): errors.append('invalid-level')
    if any(r['pos']<1 or (r['size']!=-1 and r['pos']>r['size']) for r in rows): errors.append('invalid-position')
    if any(r['parent'] is not None and r['parent'] not in table for r in rows): errors.append('missing-parent')
    if any(r['parent'] in table and r['level']!=table[r['parent']]['level']+1 for r in rows): errors.append('parent-level')
    if any(not r['branch'] and r['expanded'] is not None for r in rows): errors.append('leaf-expanded')
    if d['active'] is not None and d['active'] not in ids: errors.append('missing-active')
    if any(x in table and not table[x]['selectable'] for x in d['selected']): errors.append('invalid-selection')
    if any(r['busy'] and not r['branch'] for r in rows): errors.append('busy-leaf')
    if any(r['parent'] is None and r['level']!=1 for r in rows): errors.append('root-level')
    return errors
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 1, 'size': 3, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 2: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 6, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 2, 'size': 4, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 3: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 7, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 3, 'size': 5, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 4: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 8, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 4, 'size': 6, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])], 5: [('valid', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'a', 'selected': ['a']}, []), ('duplicate', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'r', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'r', 'selected': []}, ['duplicate-id', 'parent-level']), ('zero level', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 0, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-level', 'parent-level']), ('zero position', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 0, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('position overflow', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 9, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['invalid-position']), ('unknown size', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': -1, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, []), ('orphan', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'missing', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['missing-parent']), ('level jump', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 4, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['parent-level']), ('leaf expanded false', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': False, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['leaf-expanded']), ('missing active', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': 'gone', 'selected': []}, ['missing-active']), ('protected selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': False, 'busy': False}], 'active': None, 'selected': ['a']}, ['invalid-selection']), ('missing selection', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': ['gone']}, ['invalid-selection']), ('busy leaf', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': 'r', 'branch': False, 'expanded': None, 'selectable': True, 'busy': True}], 'active': None, 'selected': []}, ['busy-leaf']), ('indented root', {'rows': [{'id': 'r', 'level': 1, 'pos': 1, 'size': 1, 'parent': None, 'branch': True, 'expanded': True, 'selectable': True, 'busy': True}, {'id': 'a', 'level': 2, 'pos': 5, 'size': 7, 'parent': None, 'branch': False, 'expanded': None, 'selectable': True, 'busy': False}], 'active': None, 'selected': []}, ['root-level'])]}
for label, data, expected in cases[N]:
    check(label, solve(data), expected)
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 fixtureActualExpectedOutcome
valid[][]Passed
duplicate['duplicate-id', 'parent-level']['duplicate-id', 'parent-level']Passed
zero level['invalid-level', 'parent-level']['invalid-level', 'parent-level']Passed
zero position['invalid-position']['invalid-position']Passed
position overflow['invalid-position']['invalid-position']Passed
unknown size[][]Passed
orphan['missing-parent']['missing-parent']Passed
level jump['parent-level']['parent-level']Passed
leaf expanded false['leaf-expanded']['leaf-expanded']Passed
missing active['missing-active']['missing-active']Passed
protected selection['invalid-selection']['invalid-selection']Passed
missing selection[]['invalid-selection']Failed
busy leaf['busy-leaf']['busy-leaf']Passed
indented root['root-level']['root-level']Passed

SHA-256 / 610c58d4f48217d5b1afdb31da6b8d5d3785344b2fe73567dc0212e1a0ca07de

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 14 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

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Verification & scope

Synthetic deterministic hierarchical-widget data contract; not an implementation of a browser accessibility tree. 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 2026-09-29T14:43:23.195475+00:00.

Case digest / a8e76846d45f40413d2b21bcd1f6b10205c41466a3fc47a0dcef4fcdd20c4ac3