1 files changed, 15 insertions, 0 deletions
diff --git a/js/src/tests/Intl/getCanonicalLocales-with-duplicates.js b/js/src/tests/Intl/getCanonicalLocales-with-duplicates.js
new file mode 100644
index 000000000..c02956948
--- /dev/null
+++ b/js/src/tests/Intl/getCanonicalLocales-with-duplicates.js
@@ -0,0 +1,15 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Tests the getCanonicalLocales function for duplicate locales scenario.
+
+assertEqArray(Intl.getCanonicalLocales(['ab-cd', 'ff', 'de-rt', 'ab-Cd']),
+              ['ab-CD', 'ff', 'de-RT']);
+
+var locales = Intl.getCanonicalLocales(["en-US", "en-US"]);
+assertEqArray(locales, ['en-US']);
+
+if (typeof reportCompare === 'function')
+    reportCompare(0, 0);