{"abstract":"Street meter time purchase returns a wrong result when the accepted amount truncates partial minutes of charge.","category":"Toll and parking fee computation","checks":8,"contract":"Input {now, expiry (or null), paid_cents, rate_per_hour, max_minutes, enf_start, enf_end, increment}. Only whole increments are credited. At or after enforcement end nothing is sold: [null, 0]. Paid time starts at the later of now, enforcement start and any unexpired expiry; it ends at the earliest of start + purchased minutes (floor), max(now, enf_start) + max_minutes, and enf_end. Accepted cents = min(credited, ceil(used minutes * rate/60)). Return [new expiry, accepted cents].","evaluation_group":"w2-toll_and_parking_fee_computation-meter-purchase","failed_approach":"Keeping the whole payment ignores time that was clipped by the limit or enforcement end.","family":"w2-toll_and_parking_fee_computation-meter-purchase-accepted-cost","id":"FA-68476","implementations":{"attempt":{"sha256":"e6621d8b0557b263a44524b5fc9cd458503e42a97a12636c3ef684c50ed1dfa7","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    inc = x['increment']\n    c = x['paid_cents'] - x['paid_cents'] % inc\n    now = x['now']\n    if now >= x['enf_end']:\n        return [None, 0]\n    base = max(now, x['enf_start'])\n    start = base if x['expiry'] is None else max(base, x['expiry'])\n    mins = c * 60 // x['rate_per_hour']\n    end = min(start + mins, base + x['max_minutes'], x['enf_end'])\n    used = max(0, end - start)\n    cost = min(c, c if used else 0)\n    return [max(end, start), cost]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'now': 1080, 'expiry': None, 'paid_cents': 342, 'rate_per_hour': 200, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [None, 0]), ({'now': 853, 'expiry': None, 'paid_cents': 395, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [947, 392]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 491, 'expiry': None, 'paid_cents': 211, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [541, 209]), ({'now': 880, 'expiry': None, 'paid_cents': 102, 'rate_per_hour': 250, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [904, 100]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1048, 'expiry': 1120, 'paid_cents': 599, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1120, 0]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100])], [({'now': 783, 'expiry': None, 'paid_cents': 518, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [906, 513]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100]), ({'now': 608, 'expiry': 560, 'paid_cents': 57, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [623, 50]), ({'now': 1006, 'expiry': 975, 'paid_cents': 428, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 309]), ({'now': 424, 'expiry': 372, 'paid_cents': 544, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [609, 538]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 148, 'expiry': 178, 'paid_cents': 179, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 100])], [({'now': 826, 'expiry': 909, 'paid_cents': 304, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [946, 124]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1080, 'expiry': None, 'paid_cents': 252, 'rate_per_hour': 100, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 943, 'expiry': None, 'paid_cents': 503, 'rate_per_hour': 150, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 343]), ({'now': 1080, 'expiry': None, 'paid_cents': 506, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [None, 0]), ({'now': 779, 'expiry': None, 'paid_cents': 506, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [899, 300]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234])], [({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 104, 'expiry': 123, 'paid_cents': 90, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [501, 88]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 606, 'expiry': 668, 'paid_cents': 424, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [668, 0]), ({'now': 480, 'expiry': None, 'paid_cents': 287, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [645, 275]), ({'now': 480, 'expiry': None, 'paid_cents': 3, 'rate_per_hour': 150, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [480, 0]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100]), ({'now': 460, 'expiry': None, 'paid_cents': 15, 'rate_per_hour': 200, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [484, 14])], [({'now': 480, 'expiry': 490, 'paid_cents': 142, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 84]), ({'now': 480, 'expiry': None, 'paid_cents': 474, 'rate_per_hour': 150, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [660, 450]), ({'now': 480, 'expiry': 538, 'paid_cents': 595, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [680, 592]), ({'now': 1080, 'expiry': 1081, 'paid_cents': 121, 'rate_per_hour': 250, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 480, 'expiry': 543, 'paid_cents': 144, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [573, 125]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100])]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"bce033842becf4dd2099eab4727de8cd7ade5968f34615413fbc7c445bb78b4d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    inc = x['increment']\n    c = x['paid_cents'] - x['paid_cents'] % inc\n    now = x['now']\n    if now >= x['enf_end']:\n        return [None, 0]\n    base = max(now, x['enf_start'])\n    start = base if x['expiry'] is None else max(base, x['expiry'])\n    mins = c * 60 // x['rate_per_hour']\n    end = min(start + mins, base + x['max_minutes'], x['enf_end'])\n    used = max(0, end - start)\n    cost = min(c, used * x['rate_per_hour'] // 60)\n    return [max(end, start), cost]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'now': 1080, 'expiry': None, 'paid_cents': 342, 'rate_per_hour': 200, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [None, 0]), ({'now': 853, 'expiry': None, 'paid_cents': 395, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [947, 392]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 491, 'expiry': None, 'paid_cents': 211, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [541, 209]), ({'now': 880, 'expiry': None, 'paid_cents': 102, 'rate_per_hour': 250, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [904, 100]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1048, 'expiry': 1120, 'paid_cents': 599, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1120, 0]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100])], [({'now': 783, 'expiry': None, 'paid_cents': 518, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [906, 513]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100]), ({'now': 608, 'expiry': 560, 'paid_cents': 57, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [623, 50]), ({'now': 1006, 'expiry': 975, 'paid_cents': 428, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 309]), ({'now': 424, 'expiry': 372, 'paid_cents': 544, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [609, 538]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 148, 'expiry': 178, 'paid_cents': 179, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 100])], [({'now': 826, 'expiry': 909, 'paid_cents': 304, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [946, 124]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1080, 'expiry': None, 'paid_cents': 252, 'rate_per_hour': 100, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 943, 'expiry': None, 'paid_cents': 503, 'rate_per_hour': 150, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 343]), ({'now': 1080, 'expiry': None, 'paid_cents': 506, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [None, 0]), ({'now': 779, 'expiry': None, 'paid_cents': 506, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [899, 300]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234])], [({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 104, 'expiry': 123, 'paid_cents': 90, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [501, 88]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 606, 'expiry': 668, 'paid_cents': 424, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [668, 0]), ({'now': 480, 'expiry': None, 'paid_cents': 287, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [645, 275]), ({'now': 480, 'expiry': None, 'paid_cents': 3, 'rate_per_hour': 150, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [480, 0]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100]), ({'now': 460, 'expiry': None, 'paid_cents': 15, 'rate_per_hour': 200, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [484, 14])], [({'now': 480, 'expiry': 490, 'paid_cents': 142, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 84]), ({'now': 480, 'expiry': None, 'paid_cents': 474, 'rate_per_hour': 150, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [660, 450]), ({'now': 480, 'expiry': 538, 'paid_cents': 595, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [680, 592]), ({'now': 1080, 'expiry': 1081, 'paid_cents': 121, 'rate_per_hour': 250, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 480, 'expiry': 543, 'paid_cents': 144, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [573, 125]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100])]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"b77687ad2357bca217e10bc4a2de9d4b4c652520e435ca936f63f0ffe4e5f156","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    inc = x['increment']\n    c = x['paid_cents'] - x['paid_cents'] % inc\n    now = x['now']\n    if now >= x['enf_end']:\n        return [None, 0]\n    base = max(now, x['enf_start'])\n    start = base if x['expiry'] is None else max(base, x['expiry'])\n    mins = c * 60 // x['rate_per_hour']\n    end = min(start + mins, base + x['max_minutes'], x['enf_end'])\n    used = max(0, end - start)\n    cost = min(c, -(-used * x['rate_per_hour'] // 60))\n    return [max(end, start), cost]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'now': 1080, 'expiry': None, 'paid_cents': 342, 'rate_per_hour': 200, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [None, 0]), ({'now': 853, 'expiry': None, 'paid_cents': 395, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [947, 392]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 491, 'expiry': None, 'paid_cents': 211, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [541, 209]), ({'now': 880, 'expiry': None, 'paid_cents': 102, 'rate_per_hour': 250, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [904, 100]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1048, 'expiry': 1120, 'paid_cents': 599, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1120, 0]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100])], [({'now': 783, 'expiry': None, 'paid_cents': 518, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [906, 513]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100]), ({'now': 608, 'expiry': 560, 'paid_cents': 57, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [623, 50]), ({'now': 1006, 'expiry': 975, 'paid_cents': 428, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 309]), ({'now': 424, 'expiry': 372, 'paid_cents': 544, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [609, 538]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 148, 'expiry': 178, 'paid_cents': 179, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 100])], [({'now': 826, 'expiry': 909, 'paid_cents': 304, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [946, 124]), ({'now': 420, 'expiry': None, 'paid_cents': 200, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 200]), ({'now': 1080, 'expiry': None, 'paid_cents': 252, 'rate_per_hour': 100, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 943, 'expiry': None, 'paid_cents': 503, 'rate_per_hour': 150, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 343]), ({'now': 1080, 'expiry': None, 'paid_cents': 506, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [None, 0]), ({'now': 779, 'expiry': None, 'paid_cents': 506, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [899, 300]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234])], [({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 104, 'expiry': 123, 'paid_cents': 90, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [501, 88]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 606, 'expiry': 668, 'paid_cents': 424, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [668, 0]), ({'now': 480, 'expiry': None, 'paid_cents': 287, 'rate_per_hour': 100, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [645, 275]), ({'now': 480, 'expiry': None, 'paid_cents': 3, 'rate_per_hour': 150, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [480, 0]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100]), ({'now': 460, 'expiry': None, 'paid_cents': 15, 'rate_per_hour': 200, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [484, 14])], [({'now': 480, 'expiry': 490, 'paid_cents': 142, 'rate_per_hour': 100, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [540, 84]), ({'now': 480, 'expiry': None, 'paid_cents': 474, 'rate_per_hour': 150, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [660, 450]), ({'now': 480, 'expiry': 538, 'paid_cents': 595, 'rate_per_hour': 250, 'max_minutes': 240, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [680, 592]), ({'now': 1080, 'expiry': 1081, 'paid_cents': 121, 'rate_per_hour': 250, 'max_minutes': 60, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 1080, 'expiry': 1100, 'paid_cents': 100, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [None, 0]), ({'now': 600, 'expiry': 650, 'paid_cents': 400, 'rate_per_hour': 200, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 5}, [720, 234]), ({'now': 480, 'expiry': 543, 'paid_cents': 144, 'rate_per_hour': 250, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [573, 125]), ({'now': 1040, 'expiry': None, 'paid_cents': 333, 'rate_per_hour': 150, 'max_minutes': 120, 'enf_start': 480, 'enf_end': 1080, 'increment': 25}, [1080, 100])]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic, bounded toy model with a stipulated contract; it makes no claim of conformance to any agency manual or standard. 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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-toll_and_parking_fee_computation-meter-purchase-accepted-cost","generated_at":"2026-09-29T14:48:02.526693+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Fee engines bill customers in integer cents; a wrong boundary, rounding stage or cap scope silently over- or under-charges.","repair":"Restore the accepted amount rule so that the step reads `-(-used * x['rate_per_hour'] // 60)`.","root_cause":"Rounding the accepted amount down refunds a fraction of a cent the customer used.","sha256":"10094265be123a38b2c2506f392eaf32a8d6d9305ad61459a0cfa77380987e0a","title":"Street meter time purchase: the accepted amount truncates partial minutes of charge · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.224,"exit_code":1,"observations":[{"actual":[null,0],"check":"fee oracle 0","expected":[null,0],"passed":true},{"actual":[947,395],"check":"fee oracle 1","expected":[947,392],"passed":false},{"actual":[720,400],"check":"fee oracle 2","expected":[720,234],"passed":false},{"actual":[541,210],"check":"fee oracle 3","expected":[541,209],"passed":false},{"actual":[904,100],"check":"fee oracle 4","expected":[904,100],"passed":true},{"actual":[540,200],"check":"fee oracle 5","expected":[540,200],"passed":true},{"actual":[1120,0],"check":"fee oracle 6","expected":[1120,0],"passed":true},{"actual":[1080,325],"check":"fee oracle 7","expected":[1080,100],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": [null, 0], \"expected\": [null, 0], \"passed\": true}, {\"check\": \"fee oracle 1\", \"actual\": [947, 395], \"expected\": [947, 392], \"passed\": false}, {\"check\": \"fee oracle 2\", \"actual\": [720, 400], \"expected\": [720, 234], \"passed\": false}, {\"check\": \"fee oracle 3\", \"actual\": [541, 210], \"expected\": [541, 209], \"passed\": false}, {\"check\": \"fee oracle 4\", \"actual\": [904, 100], \"expected\": [904, 100], \"passed\": true}, {\"check\": \"fee oracle 5\", \"actual\": [540, 200], \"expected\": [540, 200], \"passed\": true}, {\"check\": \"fee oracle 6\", \"actual\": [1120, 0], \"expected\": [1120, 0], \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": [1080, 325], \"expected\": [1080, 100], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.532,"exit_code":1,"observations":[{"actual":[null,0],"check":"fee oracle 0","expected":[null,0],"passed":true},{"actual":[947,391],"check":"fee oracle 1","expected":[947,392],"passed":false},{"actual":[720,233],"check":"fee oracle 2","expected":[720,234],"passed":false},{"actual":[541,208],"check":"fee oracle 3","expected":[541,209],"passed":false},{"actual":[904,100],"check":"fee oracle 4","expected":[904,100],"passed":true},{"actual":[540,200],"check":"fee oracle 5","expected":[540,200],"passed":true},{"actual":[1120,0],"check":"fee oracle 6","expected":[1120,0],"passed":true},{"actual":[1080,100],"check":"fee oracle 7","expected":[1080,100],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": [null, 0], \"expected\": [null, 0], \"passed\": true}, {\"check\": \"fee oracle 1\", \"actual\": [947, 391], \"expected\": [947, 392], \"passed\": false}, {\"check\": \"fee oracle 2\", \"actual\": [720, 233], \"expected\": [720, 234], \"passed\": false}, {\"check\": \"fee oracle 3\", \"actual\": [541, 208], \"expected\": [541, 209], \"passed\": false}, {\"check\": \"fee oracle 4\", \"actual\": [904, 100], \"expected\": [904, 100], \"passed\": true}, {\"check\": \"fee oracle 5\", \"actual\": [540, 200], \"expected\": [540, 200], \"passed\": true}, {\"check\": \"fee oracle 6\", \"actual\": [1120, 0], \"expected\": [1120, 0], \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": [1080, 100], \"expected\": [1080, 100], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.152,"exit_code":0,"observations":[{"actual":[null,0],"check":"fee oracle 0","expected":[null,0],"passed":true},{"actual":[947,392],"check":"fee oracle 1","expected":[947,392],"passed":true},{"actual":[720,234],"check":"fee oracle 2","expected":[720,234],"passed":true},{"actual":[541,209],"check":"fee oracle 3","expected":[541,209],"passed":true},{"actual":[904,100],"check":"fee oracle 4","expected":[904,100],"passed":true},{"actual":[540,200],"check":"fee oracle 5","expected":[540,200],"passed":true},{"actual":[1120,0],"check":"fee oracle 6","expected":[1120,0],"passed":true},{"actual":[1080,100],"check":"fee oracle 7","expected":[1080,100],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": [null, 0], \"expected\": [null, 0], \"passed\": true}, {\"check\": \"fee oracle 1\", \"actual\": [947, 392], \"expected\": [947, 392], \"passed\": true}, {\"check\": \"fee oracle 2\", \"actual\": [720, 234], \"expected\": [720, 234], \"passed\": true}, {\"check\": \"fee oracle 3\", \"actual\": [541, 209], \"expected\": [541, 209], \"passed\": true}, {\"check\": \"fee oracle 4\", \"actual\": [904, 100], \"expected\": [904, 100], \"passed\": true}, {\"check\": \"fee oracle 5\", \"actual\": [540, 200], \"expected\": [540, 200], \"passed\": true}, {\"check\": \"fee oracle 6\", \"actual\": [1120, 0], \"expected\": [1120, 0], \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": [1080, 100], \"expected\": [1080, 100], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}