JSTests/test262/test/built-ins/Temporal/PlainDate/prototype/subtract/overflow-undefined.js

// Copyright (C) 2021 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-temporal.plaindate.prototype.subtract
description: Fallback value for overflow option
info: |
    sec-getoption step 3:
      3. If _value_ is *undefined*, return _fallback_.
    sec-temporal-totemporaloverflow step 1:
      1. Return ? GetOption(_normalizedOptions_, *"overflow"*, « String », « *"constrain"*, *"reject"* », *"constrain"*).
    sec-temporal.calendar.prototype.dateadd step 7:
      7. Let _overflow_ be ? ToTemporalOverflow(_options_).
    sec-temporal.plaindate.prototype.subtract step 7:
      7. Return ? CalendarDateAdd(_temporalDate_.[[Calendar]], _temporalDate_, _negatedDuration_, _options_).
includes: [temporalHelpers.js]
features: [Temporal]
---*/

const date = new Temporal.PlainDate(2000, 5, 31);
const duration = new Temporal.Duration(3, 1);

const explicit = date.subtract(duration, { overflow: undefined });
TemporalHelpers.assertPlainDate(explicit, 1997, 4, "M04", 30, "default overflow is constrain");
const implicit = date.subtract(duration, {});
TemporalHelpers.assertPlainDate(implicit, 1997, 4, "M04", 30, "default overflow is constrain");
const lambda = date.subtract(duration, {});
TemporalHelpers.assertPlainDate(lambda, 1997, 4, "M04", 30, "default overflow is constrain");