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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/tests/test262/harness/temporalHelpers-one-shift-time-zone.js | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/tests/test262/harness/temporalHelpers-one-shift-time-zone.js')
-rw-r--r-- | js/src/tests/test262/harness/temporalHelpers-one-shift-time-zone.js | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/js/src/tests/test262/harness/temporalHelpers-one-shift-time-zone.js b/js/src/tests/test262/harness/temporalHelpers-one-shift-time-zone.js new file mode 100644 index 0000000000..0452d30111 --- /dev/null +++ b/js/src/tests/test262/harness/temporalHelpers-one-shift-time-zone.js @@ -0,0 +1,83 @@ +// |reftest| skip -- Temporal is not supported +// Copyright (C) 2022 Igalia, S.L. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +description: > + Verify the time zone arithmetic used in TemporalHelpers.oneShiftTimeZone() + against known cases in the implementation's time zone database +includes: [compareArray.js, temporalHelpers.js] +features: [Temporal] +---*/ + +function checkTimeZoneArithmetic(shiftInstant, shiftNs, realTimeZoneName, shiftWallTime) { + // No need to test this on hosts that don't provide an Intl object. It's + // sufficient that the logic is tested on at least one host. + if (typeof globalThis.Intl === "undefined") + return; + + const tz = TemporalHelpers.oneShiftTimeZone(shiftInstant, shiftNs); + const realTz = new Temporal.TimeZone(realTimeZoneName); + + assert.sameValue( + tz.getOffsetNanosecondsFor(shiftInstant), + realTz.getOffsetNanosecondsFor(shiftInstant), + 'offset at shift instant' + ); + const minus1 = shiftInstant.subtract({ hours: 1 }); + assert.sameValue( + tz.getOffsetNanosecondsFor(minus1), + realTz.getOffsetNanosecondsFor(minus1), + 'offset at 1 hour before shift' + ); + const plus1 = shiftInstant.add({ hours: 1 }); + assert.sameValue( + tz.getOffsetNanosecondsFor(plus1), + realTz.getOffsetNanosecondsFor(plus1), + 'offset at 1 hour after shift' + ); + + assert.compareArray( + tz.getPossibleInstantsFor(shiftWallTime).map((i) => i.epochNanoseconds), + realTz.getPossibleInstantsFor(shiftWallTime).map((i) => i.epochNanoseconds), + 'possible instants for wall time' + ); + const before1 = shiftWallTime.subtract({ hours: 1 }); + assert.compareArray( + tz.getPossibleInstantsFor(before1).map((i) => i.epochNanoseconds), + realTz.getPossibleInstantsFor(before1).map((i) => i.epochNanoseconds), + 'possible instants for 1 hour before wall time' + ); + const after1 = shiftWallTime.add({ hours: 1 }); + assert.compareArray( + tz.getPossibleInstantsFor(after1).map((i) => i.epochNanoseconds), + realTz.getPossibleInstantsFor(after1).map((i) => i.epochNanoseconds), + 'possible instants for 1 hour after wall time' + ); +} + +// Check a positive DST shift from +00:00 to +01:00 +checkTimeZoneArithmetic( + new Temporal.Instant(1616893200000000000n), + 3600e9, + 'Europe/London', + new Temporal.PlainDateTime(2021, 3, 28, 1) +); + +// Check a negative DST shift from +00:00 to -01:00 +checkTimeZoneArithmetic( + new Temporal.Instant(1635642000000000000n), + -3600e9, + 'Atlantic/Azores', + new Temporal.PlainDateTime(2021, 10, 31, 1) +); + +// Check the no-shift case +checkTimeZoneArithmetic( + new Temporal.Instant(0n), + 0, + 'UTC', + new Temporal.PlainDateTime(1970, 1, 1) +); + +reportCompare(0, 0); |