1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Locale/constructor-unicode-ext-invalid.js b/js/src/tests/test262/intl402/Locale/constructor-unicode-ext-invalid.js
new file mode 100644
index 0000000000..e069053dc5
--- /dev/null
+++ b/js/src/tests/test262/intl402/Locale/constructor-unicode-ext-invalid.js
@@ -0,0 +1,33 @@
+// Copyright 2018 André Bargull; 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 treatment of specific structurally invalid tags.
+info: |
+    ApplyOptionsToTag( tag, options )
+    2. If IsStructurallyValidLanguageTag(tag) is false, throw a RangeError exception.
+features: [Intl.Locale]
+---*/
+
+const invalidLanguageTags = [
+  // Unicode extension sequence is incomplete.
+  "da-u",
+  "da-u-",
+  "da-u--",
+  "da-u-t-latn",
+  "da-u-x-priv",
+
+  // Duplicate 'u' singleton.
+  "da-u-ca-gregory-u-ca-buddhist"
+];
+
+for (const langtag of invalidLanguageTags) {
+  assert.throws(RangeError, function() {
+    new Intl.Locale(langtag)
+  },
+  `new Intl.Locale("${langtag}") throws RangeError`);
+}
+
+reportCompare(0, 0);