1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js b/js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js
new file mode 100644
index 000000000..7a358e997
--- /dev/null
+++ b/js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js
@@ -0,0 +1,38 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// Generated by make_intl_data.py. DO NOT EDIT.
+// tzdata version = 2017c
+
+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",
+    "Antarctica/South_Pole": "Antarctica/McMurdo",
+    "Asia/Chungking": "Asia/Chongqing",
+};
+
+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");
+