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Temporal: Add tests for correct rounding of epoch milliseconds in toString()

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Tim Chevalier 2025-10-30 15:23:01 -07:00 committed by Ms2ger
parent 18f6ed2627
commit 678c434dab
3 changed files with 36 additions and 0 deletions
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12
test/built-ins/Temporal/Instant/prototype/toString/fractionalseconddigits-negative.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.instant.prototype.tostring
description: Epoch milliseconds should be rounded down before adding negative micro/nanoseconds back in
features: [BigInt, Temporal]
---*/
const instant = new Temporal.Instant(-1000000000000001000n);
assert.sameValue(instant.toString(), "1938-04-24T22:13:19.999999Z",
"epoch milliseconds should be rounded down to compute seconds");

12
test/built-ins/Temporal/PlainDateTime/prototype/toString/fractionalseconddigits-negative.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plaindatetime.prototype.tostring
description: Epoch milliseconds should be rounded down before adding negative micro/nanoseconds back in
features: [Temporal]
---*/
const pdt = new Temporal.PlainDateTime(1938, 4, 24, 22, 13, 19, 999, 999);
assert.sameValue(pdt.toString(), "1938-04-24T22:13:19.999999",
"epoch milliseconds should be rounded down to compute seconds");

12
test/built-ins/Temporal/ZonedDateTime/prototype/toString/fractionalseconddigits-negative.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.zoneddatetime.prototype.tostring
description: Epoch milliseconds should be rounded down before adding negative micro/nanoseconds back in
features: [BigInt, Temporal]
---*/
const zdt = new Temporal.ZonedDateTime(-1000000000000001000n, "UTC");
assert.sameValue(zdt.toString(), "1938-04-24T22:13:19.999999+00:00[UTC]",
"epoch milliseconds should be rounded down to compute seconds");