1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/getCanonicalLocales-weird-cases.js b/js/src/tests/non262/Intl/getCanonicalLocales-weird-cases.js
new file mode 100644
index 0000000000..d67fda355f
--- /dev/null
+++ b/js/src/tests/non262/Intl/getCanonicalLocales-weird-cases.js
@@ -0,0 +1,25 @@
+// |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 =
+  [
+   "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 (let weird of weirdCases)
+  assertEqArray(Intl.getCanonicalLocales(weird), [weird]);
+
+assertThrowsInstanceOf(() => Intl.getCanonicalLocales("x-u-foo"), RangeError);
+
+if (typeof reportCompare === 'function')
+    reportCompare(0, 0);
+