1 files changed, 75 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/Locale/grandfathered.js b/js/src/tests/non262/Intl/Locale/grandfathered.js
new file mode 100644
index 0000000000..eb52bc62b4
--- /dev/null
+++ b/js/src/tests/non262/Intl/Locale/grandfathered.js
@@ -0,0 +1,75 @@
+// |reftest| skip-if(!this.hasOwnProperty('Intl'))
+
+var testData = [
+    {
+        tag: "cel-gaulish",
+        options: {
+            numberingSystem: "latn",
+        },
+        canonical: "xtg-u-nu-latn-x-cel-gaulish",
+        extensions: {
+            numberingSystem: "latn",
+        },
+    },
+
+    {
+        tag: "cel-gaulish",
+        options: {
+            region: "FR",
+            numberingSystem: "latn",
+        },
+        canonical: "xtg-FR-u-nu-latn-x-cel-gaulish",
+        extensions: {
+            numberingSystem: "latn",
+        },
+    },
+
+    {
+        tag: "art-lojban",
+        options: {
+            numberingSystem: "latn",
+        },
+        canonical: "jbo-u-nu-latn",
+        extensions: {
+            numberingSystem: "latn",
+        },
+    },
+
+    {
+        tag: "art-lojban",
+        options: {
+            region: "ZZ",
+            numberingSystem: "latn",
+        },
+        canonical: "jbo-ZZ-u-nu-latn",
+        extensions: {
+            numberingSystem: "latn",
+        },
+    },
+];
+
+for (var {tag, options, canonical, extensions} of testData) {
+    var loc = new Intl.Locale(tag, options);
+    assertEq(loc.toString(), canonical);
+
+    for (var [name, value] of Object.entries(extensions)) {
+        assertEq(loc[name], value);
+    }
+}
+
+var errorTestData = [
+    "en-gb-oed",
+    "i-default",
+    "sgn-ch-de",
+    "zh-min",
+    "zh-min-nan",
+    "zh-hakka-hakka",
+];
+
+for (var tag of errorTestData) {
+    assertThrowsInstanceOf(() => new Intl.Locale(tag), RangeError);
+    assertThrowsInstanceOf(() => new Intl.Locale(tag, {}), RangeError);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);