Add test case for non-continental time zones

test/intl402/Intl/supportedValuesOf/timeZones-include-non-continental.js

@@ -0,0 +1,59 @@
+// Copyright 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-availableprimarytimezoneidentifiers
+description: >
+  AvailablePrimaryTimeZoneIdentifiers doesn't perform any kind of filtering on
+  the time zone IDs returned therefore time zone IDs for time zones that don't
+  correspond to any continent like the Etc/* timezones as well as UTC should be
+  included in this list.
+info: |
+  6.5.3 AvailablePrimaryTimeZoneIdentifiers ( )
+
+  1. Let records be AvailableNamedTimeZoneIdentifiers().
+  2. Let result be a new empty List.
+  3. For each element timeZoneIdentifierRecord of records, do
+    a. If timeZoneIdentifierRecord.[[Identifier]] is timeZoneIdentifierRecord.[[PrimaryIdentifier]], then
+      i. Append timeZoneIdentifierRecord.[[Identifier]] to result.
+  4. Return result.
+features: [Intl-enumeration]
+---*/
+
+const nonContinentalTimeZones = [
+  "Etc/GMT+1",
+  "Etc/GMT+2",
+  "Etc/GMT+3",
+  "Etc/GMT+4",
+  "Etc/GMT+5",
+  "Etc/GMT+6",
+  "Etc/GMT+7",
+  "Etc/GMT+8",
+  "Etc/GMT+9",
+  "Etc/GMT+10",
+  "Etc/GMT+11",
+  "Etc/GMT+12",
+  "Etc/GMT-1",
+  "Etc/GMT-2",
+  "Etc/GMT-3",
+  "Etc/GMT-4",
+  "Etc/GMT-5",
+  "Etc/GMT-6",
+  "Etc/GMT-7",
+  "Etc/GMT-8",
+  "Etc/GMT-9",
+  "Etc/GMT-10",
+  "Etc/GMT-11",
+  "Etc/GMT-12",
+  "Etc/GMT-13",
+  "Etc/GMT-14",
+  "UTC",
+];
+
+const supportedTimeZones = Intl.supportedValuesOf("timeZone");
+
+for (const tz of nonContinentalTimeZones) {
+  assert(
+    supportedTimeZones.includes(tz),
+    `non-continental timezone ${tz} is not supported`,
+  );
+}