1 files changed, 23 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-sign-languages.js b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-sign-languages.js
new file mode 100644
index 0000000000..9f7b01c69e
--- /dev/null
+++ b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-sign-languages.js
@@ -0,0 +1,23 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// The IANA language subtag registry contains replacements for sign language
+// codes marked as redundant. For example:
+//
+//   Type: redundant
+//   Tag: sgn-DE
+//   Description: German Sign Language
+//   Added: 2001-11-11
+//   Deprecated: 2009-07-29
+//   Preferred-Value: gsg
+//
+// CLDR 38 added these mappings to CLDR, too.
+
+assertEq(Intl.getCanonicalLocales("sgn-DE")[0], "gsg");
+assertEq(Intl.getCanonicalLocales("sgn-DD")[0], "gsg");
+
+assertEq(Intl.getCanonicalLocales("sgn-276")[0], "gsg");
+assertEq(Intl.getCanonicalLocales("sgn-278")[0], "gsg");
+assertEq(Intl.getCanonicalLocales("sgn-280")[0], "gsg");
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);