Add test for ECMA402 PR 788

tc39/ecma402#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: test invalid offset timezone will throw.
+---*/
+let invalidOffsetTimeZones = [
+    '+3',
+    '+24',
+    '+23:0',
+    '+130',
+    '+13234',
+    '+135678',
+    '-7',
+    '-24',
+    '-014',
+    '-210',
+    '-2400',
+    '-1:10',
+    '-21:0',
+    '+0:003',
+    '+15:59:00',
+    '+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: test offset timezone format the same value as the equivalent
+  Etc/GMT offset timezone
+---*/
+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.keys(offsetTimeZones).forEach((timeZone) => {
+    let offsetDf = new Intl.DateTimeFormat("en",
+        {timeZone, dateStyle: "short", timeStyle: "short"});
+    let gmtDf = new Intl.DateTimeFormat("en",
+        {timeZone: offsetTimeZones[timeZone], dateStyle: "short", timeStyle: "short"});
+    assert.sameValue(offsetDf.format(date), gmtDf.format(date));
+});

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: test offset timezone generate the correct hour and minute
+  base on the offset timezone value.
+---*/
+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.keys(tests).forEach((timeZone) => {
+    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
+    let expected = tests[timeZone];
+    assert.sameValue(expected.hour, hour, "hour in TimeZone:" + timeZone);
+    assert.sameValue(expected.minute, minute, "minute in TimeZone:" + timeZone);
+});

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: test offset timezone with sign sync with resolvedOptions().timeZone.
+---*/
+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 actual = df.resolvedOptions().timeZone;
+    assert.sameValue(timeZone, actual);
+});

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: test offset timezone with sign sync with resolvedOptions().timeZone.
+---*/
+let validOffsetTimeZones = {
+    '+0300': '+03',
+    '+0300': '+03',
+    '+13:00': '+13',
+    '+2300': '+23',
+    '-07:00': '-07',
+    '-14': '-14',
+    '-2100': '-21',
+    '−2200': '-22',
+    '+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 actual = df.resolvedOptions().timeZone;
+    let expected = validOffsetTimeZones[timeZone];
+    assert.sameValue(expected, actual);
+});