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Add test for DST balancing
References: + https://github.com/tc39/proposal-temporal/issues/1791 Thanks @ptomato for the suggestion to use `springForwardFallBackTimeZone`.
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// Copyright (C) 2022 Igalia, S.L. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-temporal.duration.compare
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description: Unbalancing handles DST days with more than hours
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features: [Temporal]
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includes: [temporalHelpers.js]
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---*/
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const tz = TemporalHelpers.springForwardFallBackTimeZone();
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// 2000-10-29 is a 25-hour day according to this time zone...
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const relativeTo = new Temporal.ZonedDateTime(941187600_000_000_000n, tz);
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// confirm that we have rewound one year and one day:
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assert.sameValue('1999-10-29T01:00:00-08:00[Custom/Spring_Fall]', relativeTo.toString());
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const d1 = new Temporal.Duration(1, 0, 0, 1);
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const d2 = new Temporal.Duration(1, 0, 0, 0, 25);
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// ...so the durations should be equal relative to relativeTo:
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assert.sameValue(0,
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Temporal.Duration.compare(d1, d2, { relativeTo }),
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"2000-10-29 is a 25-hour day"
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);
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assert.sameValue(1,
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Temporal.Duration.compare(d1, { years: 1, hours: 24 }, { relativeTo }),
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"2020-10-29 has more than 24 hours"
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);
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