1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/supportedValuesOf-timeZones.js b/js/src/tests/non262/Intl/supportedValuesOf-timeZones.js
new file mode 100644
index 0000000000..6a200cd199
--- /dev/null
+++ b/js/src/tests/non262/Intl/supportedValuesOf-timeZones.js
@@ -0,0 +1,20 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+const timeZones = Intl.supportedValuesOf("timeZone");
+
+assertEq(new Set(timeZones).size, timeZones.length, "No duplicates are present");
+assertEqArray(timeZones, [...timeZones].sort(), "The list is sorted");
+
+// The pattern doesn't cover the complete time zone syntax, but gives a good first approximation.
+const timeZoneRE = /^[a-z0-9_+-]+(\/[a-z0-9_+-]+)*$/i;
+for (let timeZone of timeZones) {
+  assertEq(timeZoneRE.test(timeZone), true, `${timeZone} is ASCII`);
+}
+
+for (let timeZone of timeZones) {
+  let obj = new Intl.DateTimeFormat("en", {timeZone});
+  assertEq(obj.resolvedOptions().timeZone, timeZone, `${timeZone} is supported by DateTimeFormat`);
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);