Add test for ECMA402 PR 788

test/intl402/DateTimeFormat/constructor-invalid-offset-timezone.js

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+// Copyright 2023 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-createdatetimeformat
+description: Tests that invalid offset time zones are rejected.
+---*/
+let invalidOffsetTimeZones = [
+    '+3',
+    '+24',
+    '+23:0',
+    '+130',
+    '+13234',
+    '+135678',
+    '-7',
+    '-10.50',
+    '-10,50',
+    '-24',
+    '-014',
+    '-210',
+    '-2400',
+    '-1:10',
+    '-21:0',
+    '+0:003',
+    '+15:59:00',
+    '+15:59.50',
+    '+15:59,50',
+    '+222700',
+    '-02:3200',
+    '-170100',
+    '-22230',
+];
+invalidOffsetTimeZones.forEach((timeZone) => {
+    assert.throws(RangeError, function() {
+        new Intl.DateTimeFormat(undefined, {timeZone});
+    }, timeZone + ":");
+});

test/intl402/DateTimeFormat/prototype/format/offset-timezone-gmt-same.js

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+// Copyright 2023 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-createdatetimeformat
+description: >
+  Tests that date and time formatting in an offset time zone
+  matches that in the equivalent Etc/GMT±n time zone.
+---*/
+let offsetTimeZones = {
+    '+0300': 'Etc/GMT-3',
+    '+1400': 'Etc/GMT-14',
+    '+02': 'Etc/GMT-2',
+    '+13:00': 'Etc/GMT-13',
+    '-07:00': 'Etc/GMT+7',
+    '-12': 'Etc/GMT+12',
+    '−0900': 'Etc/GMT+9',
+    '−10:00': 'Etc/GMT+10',
+    '−0500': 'Etc/GMT+5',
+};
+let date = new Date('1995-12-17T03:24:56Z');
+Object.entries(offsetTimeZones).forEach(([offsetZone, gmtZone]) => {
+    let offsetDf = new Intl.DateTimeFormat("en",
+        {timeZone: offsetZone, dateStyle: "short", timeStyle: "short"});
+    let gmtDf = new Intl.DateTimeFormat("en",
+        {timeZone: gmtZone, dateStyle: "short", timeStyle: "short"});
+    assert.sameValue(offsetDf.format(date), gmtDf.format(date), `${offsetZone} vs. ${gmtZone}:`);
+});

test/intl402/DateTimeFormat/prototype/formatToParts/offset-timezone-correct.js

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+// Copyright 2023 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-createdatetimeformat
+description: >
+  Tests that formatted hour and minute are correct for offset time zones.
+---*/
+let date = new Date('1995-12-17T03:24:56Z');
+let tests = {
+    '+0301': {hour: "6", minute: "25"},
+    '+1412': {hour: "5", minute: "36"},
+    '+02':   {hour: "5", minute: "24"},
+    '+13:49': {hour: "5", minute: "13"},
+    '-07:56': {hour: "7", minute: "28"},
+    '-12': {hour: "3", minute: "24"},
+    '−0914': {hour: "6", minute: "10"},
+    '−10:03': {hour: "5", minute: "21"},
+    '−0509': {hour: "10", minute: "15"},
+};
+Object.entries(tests).forEach(([timeZone, expected]) => {
+    let df = new Intl.DateTimeFormat("en",
+        {timeZone, timeStyle: "short"});
+    let res = df.formatToParts(date);
+    let hour = res.filter((t) => t.type === "hour")[0].value
+    let minute = res.filter((t) => t.type === "minute")[0].value
+    assert.sameValue(hour, expected.hour, `hour in ${timeZone} time zone:`);
+    assert.sameValue(minute, expected.minute, `minute in ${timeZone} time zone:`);
+});

test/intl402/DateTimeFormat/prototype/resolvedOptions/offset-timezone-basic.js

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+// Copyright 2023 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-createdatetimeformat
+description: Tests that offset time zones are correctly normalized in resolvedOptions() output.
+---*/
+let validOffsetTimeZones = [
+    '+03',
+    '+13',
+    '+23',
+    '-07',
+    '-14',
+    '-21',
+    '+01:03',
+    '+15:59',
+    '+22:27',
+    '-02:32',
+    '-17:01',
+    '-22:23',
+];
+validOffsetTimeZones.forEach((timeZone) => {
+    let df = new Intl.DateTimeFormat(undefined, {timeZone});
+    let expected = timeZone;
+    if (expected.length == 3) {
+        expected += ":00";
+    }
+    assert.sameValue(df.resolvedOptions().timeZone, expected, timeZone);
+});

test/intl402/DateTimeFormat/prototype/resolvedOptions/offset-timezone-change.js

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+// Copyright 2023 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-createdatetimeformat
+description: Tests that offset time zones are correctly normalized in resolvedOptions() output.
+---*/
+let validOffsetTimeZones = {
+    '-00': '+00:00',
+    '-00:00': '+00:00',
+    '−00:00': '+00:00',
+    '+00': '+00:00',
+    '+0000': '+00:00',
+    '+0300': '+03:00',
+    '+03:00': '+03:00',
+    '+13:00': '+13:00',
+    '+2300': '+23:00',
+    '-07:00': '-07:00',
+    '-14': '-14:00',
+    '-2100': '-21:00',
+    '−2200': '-22:00',
+    '+0103': '+01:03',
+    '+15:59': '+15:59',
+    '+2227': '+22:27',
+    '-02:32': '-02:32',
+    '-1701': '-17:01',
+    '-22:23': '-22:23',
+    '−22:53': '-22:53',
+};
+Object.keys(validOffsetTimeZones).forEach((timeZone) => {
+    let df = new Intl.DateTimeFormat(undefined, {timeZone});
+    let expected = validOffsetTimeZones[timeZone];
+    assert.sameValue(df.resolvedOptions().timeZone, expected, timeZone);
+});