1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Locale/extensions-private.js b/js/src/tests/test262/intl402/Locale/extensions-private.js
new file mode 100644
index 0000000000..cd3771b57f
--- /dev/null
+++ b/js/src/tests/test262/intl402/Locale/extensions-private.js
@@ -0,0 +1,26 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.locale
+description: >
+    Verifies handling of options with privateuse tags.
+info: |
+    ApplyOptionsToTag( tag, options )
+
+    
+    ...
+    9. If tag matches neither the privateuse nor the grandfathered production, then
+    ...
+
+features: [Intl.Locale]
+---*/
+
+assert.throws(RangeError, () => new Intl.Locale("x-default", {
+  language: "fr",
+  script: "Cyrl",
+  region: "DE",
+  numberingSystem: "latn",
+}));
+
+reportCompare(0, 0);