1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/tests/Intl/NumberFormat/remove-unicode-extensions.js b/js/src/tests/Intl/NumberFormat/remove-unicode-extensions.js
new file mode 100644
index 000000000..4d5d249ad
--- /dev/null
+++ b/js/src/tests/Intl/NumberFormat/remove-unicode-extensions.js
@@ -0,0 +1,24 @@
+// |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/. */
+
+// Locale processing is supposed to internally remove any Unicode extension
+// sequences in the locale.  Test that various weird testcases invoking
+// algorithmic edge cases don't assert or throw exceptions.
+
+var weirdCases =
+  [
+   "x-u-foo",
+   "en-x-u-foo",
+   "en-a-bar-x-u-foo",
+   "en-x-u-foo-a-bar",
+   "en-a-bar-u-baz-x-u-foo",
+  ];
+
+for (var locale of weirdCases)
+  Intl.NumberFormat(locale).format(5);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);