1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/DateTimeFormat/timeZone_backzone_links.js b/js/src/tests/non262/Intl/DateTimeFormat/timeZone_backzone_links.js
new file mode 100644
index 0000000000..15806dd42c
--- /dev/null
+++ b/js/src/tests/non262/Intl/DateTimeFormat/timeZone_backzone_links.js
@@ -0,0 +1,48 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// Generated by make_intl_data.py. DO NOT EDIT.
+// tzdata version = 2023c
+
+const tzMapper = [
+    x => x,
+    x => x.toUpperCase(),
+    x => x.toLowerCase(),
+];
+
+// This file was generated with historical, pre-1970 backzone information
+// respected. Therefore, every zone key listed below points to a target
+// in the backzone file and not to its modern-day target as IANA ignoring
+// backzones would say.
+
+// Backzone links derived from IANA Time Zone Database.
+const links = {
+    "Africa/Asmera": "Africa/Asmara",
+    "America/Kralendijk": "America/Curacao",
+    "America/Lower_Princes": "America/Curacao",
+    "America/Marigot": "America/Port_of_Spain",
+    "America/St_Barthelemy": "America/Port_of_Spain",
+    "America/Virgin": "America/St_Thomas",
+    "Antarctica/South_Pole": "Antarctica/McMurdo",
+    "Arctic/Longyearbyen": "Europe/Oslo",
+    "Asia/Chungking": "Asia/Chongqing",
+    "Iceland": "Atlantic/Reykjavik",
+    "Pacific/Ponape": "Pacific/Pohnpei",
+    "Pacific/Truk": "Pacific/Chuuk",
+    "Pacific/Yap": "Pacific/Chuuk",
+};
+
+for (let [linkName, target] of Object.entries(links)) {
+    if (target === "Etc/UTC" || target === "Etc/GMT")
+        target = "UTC";
+
+    for (let map of tzMapper) {
+        let dtf = new Intl.DateTimeFormat(undefined, {timeZone: map(linkName)});
+        let resolvedTimeZone = dtf.resolvedOptions().timeZone;
+        assertEq(resolvedTimeZone, target, `${linkName} -> ${target}`);
+    }
+}
+
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0, "ok");
+