test262/test/intl402/Temporal/ZonedDateTime/from/etc-timezone.js

// Copyright (C) 2022 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-temporal.zoneddatetime.from
description: Some Etc/GMT{+/-}{0}N timezones are valid, but not all
features: [Temporal, canonical-tz]
---*/

// "Etc/GMT-0" through "Etc/GMT-14" are OK

const fields = { year: 1970, month: 1, day: 1 };

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14].forEach((n) => {
  const tz = "Etc/GMT-" + n;
  const instance = Temporal.ZonedDateTime.from({ ...fields, timeZone: tz });
  assert.sameValue(
    instance.timeZoneId,
    tz,
    tz + " is a valid timezone"
  );
});

const gmtMinus24TZ = "Etc/GMT-24";
assert.throws(
  RangeError,
  () => Temporal.ZonedDateTime.from({ ...fields, timeZone: gmtMinus24TZ }),
  gmtMinus24TZ + " is an invalid timezone"
);

// "Etc/GMT-0N" is not OK (1 ≤ N ≤ 9)
[1, 2, 3, 4, 5, 6, 7, 8, 9].forEach((n) => {
  const tz = "Etc/GMT-0" + n;
  assert.throws(
    RangeError,
    () => Temporal.ZonedDateTime.from({ ...fields, timeZone: tz }),
    tz + " is an invalid timezone"
  );
});

// "Etc/GMT+0N" is not OK (0 ≤ N ≤ 9)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9].forEach((n) => {
  const tz = "Etc/GMT+0" + n;
  assert.throws(
    RangeError,
    () => Temporal.ZonedDateTime.from({ ...fields, timeZone: tz }),
    tz + " is an invalid timezone"
    );
});

// "Etc/GMT+0" through "Etc/GMT+12" are OK

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12].forEach((n) => {
  const tz = "Etc/GMT+" + n;
  const instance = Temporal.ZonedDateTime.from({ ...fields, timeZone: tz });
  assert.sameValue(
    instance.timeZoneId,
    tz,
    tz + " is a valid timezone"
  );
});

const gmtPlus24TZ = "Etc/GMT+24";
assert.throws(
  RangeError,
  () => Temporal.ZonedDateTime.from({ ...fields, timeZone: gmtPlus24TZ }),
  gmtPlus24TZ + " is an invalid timezone"
);