1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Locale/constructor-unicode-ext-valid.js b/js/src/tests/test262/intl402/Locale/constructor-unicode-ext-valid.js
new file mode 100644
index 0000000000..20c37c7981
--- /dev/null
+++ b/js/src/tests/test262/intl402/Locale/constructor-unicode-ext-valid.js
@@ -0,0 +1,40 @@
+// 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 canonicalization of specific tags.
+info: |
+    ApplyOptionsToTag( tag, options )
+    10. Return CanonicalizeLanguageTag(tag).
+features: [Intl.Locale]
+---*/
+
+const validLanguageTags = {
+    // Duplicate keywords are removed.
+    "da-u-ca-gregory-ca-buddhist": "da-u-ca-gregory",
+
+    // Keywords currently used in Intl specs are reordered in US-ASCII order.
+    "zh-u-nu-hans-ca-chinese": "zh-u-ca-chinese-nu-hans",
+    "zh-u-ca-chinese-nu-hans": "zh-u-ca-chinese-nu-hans",
+
+    // Even keywords currently not used in Intl specs are reordered in US-ASCII order.
+    "de-u-cu-eur-nu-latn": "de-u-cu-eur-nu-latn",
+    "de-u-nu-latn-cu-eur": "de-u-cu-eur-nu-latn",
+
+    // Attributes in Unicode extensions are reordered in US-ASCII order.
+    "pt-u-attr-ca-gregory": "pt-u-attr-ca-gregory",
+    "pt-u-attr1-attr2-ca-gregory": "pt-u-attr1-attr2-ca-gregory",
+    "pt-u-attr2-attr1-ca-gregory": "pt-u-attr1-attr2-ca-gregory",
+};
+
+for (const [langtag, canonical] of Object.entries(validLanguageTags)) {
+    assert.sameValue(
+      new Intl.Locale(langtag).toString(),
+      canonical,
+      `new Intl.Locale("${langtag}").toString() returns "${canonical}"`
+    );
+}
+
+reportCompare(0, 0);