Add tests: "Extend TimeZoneName Option" proposal (#3042)

test/intl402/DateTimeFormat/constructor-options-timeZoneName-invalid.js

@@ -0,0 +1,28 @@
+// Copyright 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-initializedatetimeformat
+description:
+  Invalid values for the `timeZoneName` option of the DateTimeFormat constructor
+features: [Intl.DateTimeFormat-extend-timezonename]
+---*/
+
+assert.throws(RangeError, function () {
+  new Intl.DateTimeFormat('en', { timeZoneName: '' });
+}, 'empty string');
+
+assert.throws(RangeError, function () {
+  new Intl.DateTimeFormat('en', { timeZoneName: 'short ' });
+}, '"short "');
+
+assert.throws(RangeError, function () {
+  new Intl.DateTimeFormat('en', { timeZoneName: ' long' });
+}, '" long"');
+
+assert.throws(RangeError, function () {
+  new Intl.DateTimeFormat('en', { timeZoneName: 'offset' });
+}, '"offset"');
+
+assert.throws(RangeError, function () {
+  new Intl.DateTimeFormat('en', { timeZoneName: 'generic' });
+}, '"generic"');

test/intl402/DateTimeFormat/constructor-options-timeZoneName-valid.js

@@ -0,0 +1,28 @@
+// Copyright 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-initializedatetimeformat
+description:
+  Valid values for the `timeZoneName` option of the DateTimeFormat constructor
+features: [Intl.DateTimeFormat-extend-timezonename]
+---*/
+
+var dtf;
+
+dtf = new Intl.DateTimeFormat('en', { timeZoneName: 'short' });
+assert.sameValue(dtf.resolvedOptions().timeZoneName, 'short');
+
+dtf = new Intl.DateTimeFormat('en', { timeZoneName: 'long' });
+assert.sameValue(dtf.resolvedOptions().timeZoneName, 'long');
+
+dtf = new Intl.DateTimeFormat('en', { timeZoneName: 'shortOffset' });
+assert.sameValue(dtf.resolvedOptions().timeZoneName, 'shortOffset');
+
+dtf = new Intl.DateTimeFormat('en', { timeZoneName: 'longOffset' });
+assert.sameValue(dtf.resolvedOptions().timeZoneName, 'longOffset');
+
+dtf = new Intl.DateTimeFormat('en', { timeZoneName: 'shortGeneric' });
+assert.sameValue(dtf.resolvedOptions().timeZoneName, 'shortGeneric');
+
+dtf = new Intl.DateTimeFormat('en', { timeZoneName: 'longGeneric' });
+assert.sameValue(dtf.resolvedOptions().timeZoneName, 'longGeneric');