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Test that Intl.DateTimeFormat canonicalizes the timezones "Etc/GMT", "Etc/UTC", and "GMT" to "UTC" #4328

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Test that Intl.DateTimeFormat canonicalizes the timezones "Etc/GMT", "Etc/UTC", and "GMT" to "UTC" #4328

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26 changes: 26 additions & 0 deletions test/intl402/DateTimeFormat/canonicalize-utc-timezone.js
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// Copyright 2024 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-createdatetimeformat
description: Tests that the time zone names "Etc/UTC", "Etc/GMT", and "GMT" all resolve to "UTC".
info: |
CreateDateTimeFormat ( dateTimeFormat, locales, options, required, default )

29. If IsTimeZoneOffsetString(timeZone) is true, then
...
30. Else,
a. Let timeZoneIdentifierRecord be GetAvailableNamedTimeZoneIdentifier(timeZone).

GetAvailableNamedTimeZoneIdentifier ( timeZoneIdentifier )

...
5. For each element identifier of identifiers, do
...
c. If primary is one of "Etc/UTC", "Etc/GMT", or "GMT", set primary to "UTC".
---*/

const utcIdentifiers = ["Etc/GMT", "Etc/UTC", "GMT"];

for (const timeZone of utcIdentifiers){
assert.sameValue(new Intl.DateTimeFormat([], {timeZone}).resolvedOptions().timeZone, "UTC", "Time zone name " + timeZone + " not canonicalized to 'UTC'.");
}
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