Add test for DST balancing

References:

+ https://github.com/tc39/proposal-temporal/issues/1791

Thanks @ptomato for the suggestion to use
`springForwardFallBackTimeZone`.
This commit is contained in:
Jesse Alama 2022-02-03 11:54:45 +01:00 committed by Philip Chimento
parent 3ab8adc237
commit 2aa754b7cf

View File

@ -0,0 +1,33 @@
// 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.duration.compare
description: Unbalancing handles DST days with more than hours
features: [Temporal]
includes: [temporalHelpers.js]
---*/
const tz = TemporalHelpers.springForwardFallBackTimeZone();
// 2000-10-29 is a 25-hour day according to this time zone...
const relativeTo = new Temporal.ZonedDateTime(941187600_000_000_000n, tz);
// confirm that we have rewound one year and one day:
assert.sameValue('1999-10-29T01:00:00-08:00[Custom/Spring_Fall]', relativeTo.toString());
const d1 = new Temporal.Duration(1, 0, 0, 1);
const d2 = new Temporal.Duration(1, 0, 0, 0, 25);
// ...so the durations should be equal relative to relativeTo:
assert.sameValue(0,
Temporal.Duration.compare(d1, d2, { relativeTo }),
"2000-10-29 is a 25-hour day"
);
assert.sameValue(1,
Temporal.Duration.compare(d1, { years: 1, hours: 24 }, { relativeTo }),
"2020-10-29 has more than 24 hours"
);