1 files changed, 52 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-grandfathered.js b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-grandfathered.js
new file mode 100644
index 0000000000..028127f110
--- /dev/null
+++ b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-grandfathered.js
@@ -0,0 +1,52 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// Unicode BCP 47 locale identifiers don't support irregular grandfathered tags.
+var irregularGrandfathered = [
+    "en-gb-oed",
+    "i-ami",
+    "i-bnn",
+    "i-default",
+    "i-enochian",
+    "i-hak",
+    "i-klingon",
+    "i-lux",
+    "i-mingo",
+    "i-navajo",
+    "i-pwn",
+    "i-tao",
+    "i-tay",
+    "i-tsu",
+    "sgn-be-fr",
+    "sgn-be-nl",
+    "sgn-ch-de",
+];
+
+// Unicode BCP 47 locale identifiers don't support regular grandfathered tags
+// which contain an extlang-like subtag.
+var regularGrandfatheredWithExtlangLike = [
+    "no-bok",
+    "no-nyn",
+    "zh-min",
+    "zh-min-nan",
+];
+
+// Unicode BCP 47 locale identifiers do support regular grandfathered tags
+// which contain a variant-like subtag.
+var regularGrandfatheredWithVariantLike = {
+    "art-lojban": "jbo",
+    "cel-gaulish": "xtg-x-cel-gaulish",
+    "zh-guoyu": "zh",
+    "zh-hakka": "hak",
+    "zh-xiang": "hsn",
+};
+
+for (let locale of [...irregularGrandfathered, ...regularGrandfatheredWithExtlangLike]) {
+    assertThrowsInstanceOf(() => Intl.getCanonicalLocales(locale), RangeError);
+}
+
+for (let [locale, canonical] of Object.entries(regularGrandfatheredWithVariantLike)) {
+    assertEq(Intl.getCanonicalLocales(locale)[0], canonical);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);