FA-66401 / Airline fare rule evaluation / Open access

Seasons spanning New Year never match · case 01

Travel on 3 January is priced as LOW instead of the December-January PEAK season.

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ROOT CAUSE

Ranges whose start follows their end are tested as ordinary ranges, which are empty.

VERIFIED REPAIR

For wrapping seasons, match dates on or after start or on or before end.

Unsuccessful approach: Using and instead of or keeps the wrapping range empty.

Case contract

Input {'date','seasons':[[start 'M-D', end 'M-D' (unpadded allowed), weekdays string of ISO digits 1=Mon..7=Sun, code]]}. A season with start after end wraps the year end. Both ends inclusive. Return the code of the first season (list order) containing the date on an allowed weekday, else 'NONE'.

Why this case matters

Fare seasonality tables use month-day ranges that can wrap the year boundary and are further restricted by day of week.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import datetime
N = 1
observations = []
def solve(x):
    d = datetime.date.fromisoformat(x['date'])
    md = (d.month, d.day)
    for start, end, dow, code in x['seasons']:
        s = tuple(int(p) for p in start.split('-'))
        e = tuple(int(p) for p in end.split('-'))
        inside = s <= md <= e
        if inside and str(d.isoweekday()) in dow:
            return code
    return 'NONE'
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['New Year inside wrap season', {'date': '2028-01-03', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-05', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-13', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-02-24', 'seasons': [['10-27', '3-18', '257', 'S0'], ['10-8', '11-12', '2346', 'S1'], ['3-2', '4-14', '23467', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2029-09-07', 'seasons': [['12-12', '5-9', '123456', 'S0'], ['12-8', '2-16', '1234567', 'S1'], ['6-10', '10-12', '12347', 'S2']]}, 'NONE'], ['sampled case 3', {'date': '2029-03-20', 'seasons': [['7-27', '9-9', '123567', 'S0'], ['10-31', '12-13', '1357', 'S1']]}, 'NONE']], [['New Year inside wrap season', {'date': '2028-01-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-11', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-06', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-14', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-05-03', 'seasons': [['5-4', '7-25', '13457', 'S0'], ['6-18', '9-12', '1234567', 'S1'], ['2-7', '6-1', '3', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2027-05-20', 'seasons': [['8-18', '2-4', '17', 'S0'], ['12-23', '12-28', '1267', 'S1']]}, 'NONE'], ['sampled case 3', {'date': '2028-01-27', 'seasons': [['2-5', '2-6', '136', 'S0'], ['11-22', '3-11', '23', 'S1'], ['10-29', '11-15', '67', 'S2'], ['4-23', '6-13', '1367', 'S3']]}, 'NONE']], [['New Year inside wrap season', {'date': '2028-01-05', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-18', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-07', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-15', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2028-09-07', 'seasons': [['12-12', '3-3', '15', 'S0'], ['4-5', '4-30', '6', 'S1'], ['12-10', '1-5', '136', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2027-08-20', 'seasons': [['10-3', '2-23', '137', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2029-01-15', 'seasons': [['1-2', '5-8', '16', 'S0'], ['1-19', '6-11', '1234567', 'S1'], ['10-17', '1-6', '2456', 'S2'], ['11-19', '1-26', '34567', 'S3']]}, 'S0']], [['New Year inside wrap season', {'date': '2028-01-06', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-25', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-08', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'NONE'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-16', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2028-03-30', 'seasons': [['1-26', '6-22', '4', 'S0'], ['5-16', '8-21', '123467', 'S1'], ['8-21', '11-24', '123467', 'S2'], ['2-13', '7-22', '1246', 'S3']]}, 'S0'], ['sampled case 2', {'date': '2029-03-23', 'seasons': [['9-11', '3-12', '1234', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2029-03-01', 'seasons': [['4-26', '5-25', '1234567', 'S0'], ['10-24', '12-15', '7', 'S1'], ['10-4', '3-14', '1246', 'S2']]}, 'S2']], [['New Year inside wrap season', {'date': '2028-01-07', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-09', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'NONE'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-17', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-04-07', 'seasons': [['12-9', '5-18', '123456', 'S0'], ['11-27', '12-4', '12457', 'S1']]}, 'S0'], ['sampled case 2', {'date': '2027-10-12', 'seasons': [['7-20', '1-2', '4', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2027-06-11', 'seasons': [['9-12', '2-18', '46', 'S0'], ['1-5', '7-14', '4', 'S1'], ['3-28', '6-4', '1234567', 'S2'], ['8-26', '9-24', '123567', 'S3']]}, 'NONE']]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), 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 fixture	Actual	Expected	Outcome
New Year inside wrap season	`NONE`	`PEAK`	Failed
season end day	`HIGH_WK`	`HIGH_WK`	Passed
Sunday in summer	`HIGH_WE`	`HIGH_WE`	Passed
autumn weekday	`SHOULDER`	`SHOULDER`	Passed
wrap end date	`NONE`	`PEAK`	Failed
overlapping seasons first wins	`DEC`	`DEC`	Passed
two-digit month compare	`FALL`	`FALL`	Passed
sampled case 1	`NONE`	`NONE`	Passed
sampled case 2	`NONE`	`NONE`	Passed
sampled case 3	`NONE`	`NONE`	Passed

SHA-256 / 352f2eaa7e0286a2f152a5a1251f07817f6d0c4e6a9c13ae050a036d07c57044

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import datetime
N = 1
observations = []
def solve(x):
    d = datetime.date.fromisoformat(x['date'])
    md = (d.month, d.day)
    for start, end, dow, code in x['seasons']:
        s = tuple(int(p) for p in start.split('-'))
        e = tuple(int(p) for p in end.split('-'))
        inside = s <= md <= e if s <= e else (md >= s and md <= e)
        if inside and str(d.isoweekday()) in dow:
            return code
    return 'NONE'
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['New Year inside wrap season', {'date': '2028-01-03', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-05', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-13', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-02-24', 'seasons': [['10-27', '3-18', '257', 'S0'], ['10-8', '11-12', '2346', 'S1'], ['3-2', '4-14', '23467', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2029-09-07', 'seasons': [['12-12', '5-9', '123456', 'S0'], ['12-8', '2-16', '1234567', 'S1'], ['6-10', '10-12', '12347', 'S2']]}, 'NONE'], ['sampled case 3', {'date': '2029-03-20', 'seasons': [['7-27', '9-9', '123567', 'S0'], ['10-31', '12-13', '1357', 'S1']]}, 'NONE']], [['New Year inside wrap season', {'date': '2028-01-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-11', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-06', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-14', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-05-03', 'seasons': [['5-4', '7-25', '13457', 'S0'], ['6-18', '9-12', '1234567', 'S1'], ['2-7', '6-1', '3', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2027-05-20', 'seasons': [['8-18', '2-4', '17', 'S0'], ['12-23', '12-28', '1267', 'S1']]}, 'NONE'], ['sampled case 3', {'date': '2028-01-27', 'seasons': [['2-5', '2-6', '136', 'S0'], ['11-22', '3-11', '23', 'S1'], ['10-29', '11-15', '67', 'S2'], ['4-23', '6-13', '1367', 'S3']]}, 'NONE']], [['New Year inside wrap season', {'date': '2028-01-05', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-18', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-07', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-15', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2028-09-07', 'seasons': [['12-12', '3-3', '15', 'S0'], ['4-5', '4-30', '6', 'S1'], ['12-10', '1-5', '136', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2027-08-20', 'seasons': [['10-3', '2-23', '137', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2029-01-15', 'seasons': [['1-2', '5-8', '16', 'S0'], ['1-19', '6-11', '1234567', 'S1'], ['10-17', '1-6', '2456', 'S2'], ['11-19', '1-26', '34567', 'S3']]}, 'S0']], [['New Year inside wrap season', {'date': '2028-01-06', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-25', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-08', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'NONE'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-16', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2028-03-30', 'seasons': [['1-26', '6-22', '4', 'S0'], ['5-16', '8-21', '123467', 'S1'], ['8-21', '11-24', '123467', 'S2'], ['2-13', '7-22', '1246', 'S3']]}, 'S0'], ['sampled case 2', {'date': '2029-03-23', 'seasons': [['9-11', '3-12', '1234', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2029-03-01', 'seasons': [['4-26', '5-25', '1234567', 'S0'], ['10-24', '12-15', '7', 'S1'], ['10-4', '3-14', '1246', 'S2']]}, 'S2']], [['New Year inside wrap season', {'date': '2028-01-07', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-09', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'NONE'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-17', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-04-07', 'seasons': [['12-9', '5-18', '123456', 'S0'], ['11-27', '12-4', '12457', 'S1']]}, 'S0'], ['sampled case 2', {'date': '2027-10-12', 'seasons': [['7-20', '1-2', '4', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2027-06-11', 'seasons': [['9-12', '2-18', '46', 'S0'], ['1-5', '7-14', '4', 'S1'], ['3-28', '6-4', '1234567', 'S2'], ['8-26', '9-24', '123567', 'S3']]}, 'NONE']]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), 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 fixture	Actual	Expected	Outcome
New Year inside wrap season	`NONE`	`PEAK`	Failed
season end day	`HIGH_WK`	`HIGH_WK`	Passed
Sunday in summer	`HIGH_WE`	`HIGH_WE`	Passed
autumn weekday	`SHOULDER`	`SHOULDER`	Passed
wrap end date	`NONE`	`PEAK`	Failed
overlapping seasons first wins	`DEC`	`DEC`	Passed
two-digit month compare	`FALL`	`FALL`	Passed
sampled case 1	`NONE`	`NONE`	Passed
sampled case 2	`NONE`	`NONE`	Passed
sampled case 3	`NONE`	`NONE`	Passed

SHA-256 / fed87c139092112209eaaa81468333fcfc093e59725bd64483d46f3a8e210ec6

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import datetime
N = 1
observations = []
def solve(x):
    d = datetime.date.fromisoformat(x['date'])
    md = (d.month, d.day)
    for start, end, dow, code in x['seasons']:
        s = tuple(int(p) for p in start.split('-'))
        e = tuple(int(p) for p in end.split('-'))
        inside = s <= md <= e if s <= e else (md >= s or md <= e)
        if inside and str(d.isoweekday()) in dow:
            return code
    return 'NONE'
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['New Year inside wrap season', {'date': '2028-01-03', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-05', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-13', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-02-24', 'seasons': [['10-27', '3-18', '257', 'S0'], ['10-8', '11-12', '2346', 'S1'], ['3-2', '4-14', '23467', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2029-09-07', 'seasons': [['12-12', '5-9', '123456', 'S0'], ['12-8', '2-16', '1234567', 'S1'], ['6-10', '10-12', '12347', 'S2']]}, 'NONE'], ['sampled case 3', {'date': '2029-03-20', 'seasons': [['7-27', '9-9', '123567', 'S0'], ['10-31', '12-13', '1357', 'S1']]}, 'NONE']], [['New Year inside wrap season', {'date': '2028-01-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-11', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-06', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-14', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-05-03', 'seasons': [['5-4', '7-25', '13457', 'S0'], ['6-18', '9-12', '1234567', 'S1'], ['2-7', '6-1', '3', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2027-05-20', 'seasons': [['8-18', '2-4', '17', 'S0'], ['12-23', '12-28', '1267', 'S1']]}, 'NONE'], ['sampled case 3', {'date': '2028-01-27', 'seasons': [['2-5', '2-6', '136', 'S0'], ['11-22', '3-11', '23', 'S1'], ['10-29', '11-15', '67', 'S2'], ['4-23', '6-13', '1367', 'S3']]}, 'NONE']], [['New Year inside wrap season', {'date': '2028-01-05', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-18', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-07', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'SHOULDER'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-15', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2028-09-07', 'seasons': [['12-12', '3-3', '15', 'S0'], ['4-5', '4-30', '6', 'S1'], ['12-10', '1-5', '136', 'S2']]}, 'NONE'], ['sampled case 2', {'date': '2027-08-20', 'seasons': [['10-3', '2-23', '137', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2029-01-15', 'seasons': [['1-2', '5-8', '16', 'S0'], ['1-19', '6-11', '1234567', 'S1'], ['10-17', '1-6', '2456', 'S2'], ['11-19', '1-26', '34567', 'S3']]}, 'S0']], [['New Year inside wrap season', {'date': '2028-01-06', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-25', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-08', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'NONE'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-16', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2028-03-30', 'seasons': [['1-26', '6-22', '4', 'S0'], ['5-16', '8-21', '123467', 'S1'], ['8-21', '11-24', '123467', 'S2'], ['2-13', '7-22', '1246', 'S3']]}, 'S0'], ['sampled case 2', {'date': '2029-03-23', 'seasons': [['9-11', '3-12', '1234', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2029-03-01', 'seasons': [['4-26', '5-25', '1234567', 'S0'], ['10-24', '12-15', '7', 'S1'], ['10-4', '3-14', '1246', 'S2']]}, 'S2']], [['New Year inside wrap season', {'date': '2028-01-07', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['season end day', {'date': '2027-08-31', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WK'], ['Sunday in summer', {'date': '2027-07-04', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'HIGH_WE'], ['autumn weekday', {'date': '2027-10-09', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'NONE'], ['wrap end date', {'date': '2029-01-10', 'seasons': [['12-15', '1-10', '1234567', 'PEAK'], ['6-1', '8-31', '12345', 'HIGH_WK'], ['6-1', '8-31', '67', 'HIGH_WE'], ['1-11', '5-31', '1234567', 'LOW'], ['9-1', '12-14', '1234', 'SHOULDER']]}, 'PEAK'], ['overlapping seasons first wins', {'date': '2027-12-20', 'seasons': [['12-1', '12-31', '1234567', 'DEC'], ['12-15', '1-10', '1234567', 'PEAK']]}, 'DEC'], ['two-digit month compare', {'date': '2027-10-17', 'seasons': [['9-1', '11-30', '1234567', 'FALL'], ['3-1', '5-31', '1234567', 'SPRING']]}, 'FALL'], ['sampled case 1', {'date': '2029-04-07', 'seasons': [['12-9', '5-18', '123456', 'S0'], ['11-27', '12-4', '12457', 'S1']]}, 'S0'], ['sampled case 2', {'date': '2027-10-12', 'seasons': [['7-20', '1-2', '4', 'S0']]}, 'NONE'], ['sampled case 3', {'date': '2027-06-11', 'seasons': [['9-12', '2-18', '46', 'S0'], ['1-5', '7-14', '4', 'S1'], ['3-28', '6-4', '1234567', 'S2'], ['8-26', '9-24', '123567', 'S3']]}, 'NONE']]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), 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 fixture	Actual	Expected	Outcome
New Year inside wrap season	`PEAK`	`PEAK`	Passed
season end day	`HIGH_WK`	`HIGH_WK`	Passed
Sunday in summer	`HIGH_WE`	`HIGH_WE`	Passed
autumn weekday	`SHOULDER`	`SHOULDER`	Passed
wrap end date	`PEAK`	`PEAK`	Passed
overlapping seasons first wins	`DEC`	`DEC`	Passed
two-digit month compare	`FALL`	`FALL`	Passed
sampled case 1	`NONE`	`NONE`	Passed
sampled case 2	`NONE`	`NONE`	Passed
sampled case 3	`NONE`	`NONE`	Passed

SHA-256 / ccd75ee65da7efcbf529102e44754070090c5f98e1f2133c000d8a8c12a5c641

Verification & scope

A stipulated toy fare-rule contract with invented constants; it is not an ATPCO or carrier tariff implementation and makes no claim of industry-standard conformance. 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 2026-09-29T14:47:43.414584+00:00.

Case digest / 71a67a11b35a01a13ff713152d905a43b60ad59b335fdf13e73df49516011d6e