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Temporal: Tests for dates out-of-range when finding end of month 

In PlainYearMonth arithmetic, we need to find the end of the month when
adding a negative duration or subtracting a positive one. This end of the
month can be out of range.

Test case based on one provided by Anba. See issue:
https://github.com/tc39/proposal-temporal/issues/2700
This commit is contained in:
Philip Chimento 2023-10-11 11:45:10 -07:00 committed by Philip Chimento
parent 0b75d626b9
commit 70c36b6584
2 changed files with 60 additions and 0 deletions
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30
test/built-ins/Temporal/PlainYearMonth/prototype/add/end-of-month-out-of-range.js vendored Normal file
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// Copyright (C) 2023 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plainyearmonth.prototype.add
description: RangeError thrown when adding negative duration and end of month is out of range
features: [Temporal]
info: |
AddDurationToOrSubtractDurationFromPlainYearMonth:
12. If _sign_ < 0, then
a. Let _oneMonthDuration_ be ! CreateTemporalDuration(0, 1, 0, 0, 0, 0, 0, 0, 0, 0).
b. Let _nextMonth_ be ? CalendarDateAdd(_calendar_, _intermediateDate_, _oneMonthDuration_, *undefined*, _dateAdd_).
c. Let _endOfMonthISO_ be ! AddISODate(_nextMonth_.[[ISOYear]], _nextMonth_.[[ISOMonth]], _nextMonth_.[[ISODay]], 0, 0, 0, -1, *"constrain"*).
d. Let _endOfMonth_ be ? CreateTemporalDate(_endOfMonthISO_.[[Year]], _endOfMonthISO_.[[Month]], _endOfMonthISO_.[[Day]], _calendar_).
---*/
// Based on a test case by André Bargull <andre.bargull@gmail.com>
const duration = new Temporal.Duration(0, 0, 0, -1);
// Calendar addition result is out of range
assert.throws(RangeError, () => new Temporal.PlainYearMonth(275760, 9).add(duration), "Addition of 1 month to receiver out of range");
// Calendar addition succeeds, but subtracting 1 day gives out of range result
const cal = new class extends Temporal.Calendar {
dateAdd() {
return new Temporal.PlainDate(-271821, 4, 19);
}
}("iso8601");
assert.throws(RangeError, () => new Temporal.PlainYearMonth(2000, 1, cal).add(duration), "Subtraction of 1 day from next month out of range");

30
test/built-ins/Temporal/PlainYearMonth/prototype/subtract/end-of-month-out-of-range.js vendored Normal file
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// Copyright (C) 2023 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plainyearmonth.prototype.subtract
description: RangeError thrown when subtracting positive duration and end of month is out of range
features: [Temporal]
info: |
AddDurationToOrSubtractDurationFromPlainYearMonth:
12. If _sign_ &lt; 0, then
a. Let _oneMonthDuration_ be ! CreateTemporalDuration(0, 1, 0, 0, 0, 0, 0, 0, 0, 0).
b. Let _nextMonth_ be ? CalendarDateAdd(_calendar_, _intermediateDate_, _oneMonthDuration_, *undefined*, _dateAdd_).
c. Let _endOfMonthISO_ be ! AddISODate(_nextMonth_.[[ISOYear]], _nextMonth_.[[ISOMonth]], _nextMonth_.[[ISODay]], 0, 0, 0, -1, *"constrain"*).
d. Let _endOfMonth_ be ? CreateTemporalDate(_endOfMonthISO_.[[Year]], _endOfMonthISO_.[[Month]], _endOfMonthISO_.[[Day]], _calendar_).
---*/
// Based on a test case by André Bargull <andre.bargull@gmail.com>
const duration = new Temporal.Duration(0, 0, 0, 1);
// Calendar addition result is out of range
assert.throws(RangeError, () => new Temporal.PlainYearMonth(275760, 9).subtract(duration), "Addition of 1 month to receiver out of range");
// Calendar addition succeeds, but subtracting 1 day gives out of range result
const cal = new class extends Temporal.Calendar {
dateAdd() {
return new Temporal.PlainDate(-271821, 4, 19);
}
}("iso8601");
assert.throws(RangeError, () => new Temporal.PlainYearMonth(2000, 1, cal).subtract(duration), "Subtraction of 1 day from next month out of range");