diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/intl402/ch10/10.1/10.1.1_19_b.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/intl402/ch10/10.1/10.1.1_19_b.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @description Tests the special handling of the "co" key in Intl.Collator.
+ * @author Norbert Lindenberg
+ */
+
+function checkCollation(extensionCoValue, usageValue, expectedCollations, expectedUsage) {
+    var requestLocale = extensionCoValue !== undefined ? "de-DE-u-co-" + extensionCoValue : "de-DE";
+    var options = usageValue !== undefined ? { usage: usageValue } : undefined;
+    var collator = new Intl.Collator([requestLocale], options);
+
+    var collation = collator.resolvedOptions().collation;
+    if (expectedCollations.indexOf(collation) === -1) {
+        $ERROR((extensionCoValue === undefined ? "Default collation" : "Collation for \"" + extensionCoValue) +
+            "\" should be " + expectedCollations.join(" or ") + ", but is " + collation + ".");
+    }
+
+    var usage = collator.resolvedOptions().usage;
+    if (expectedUsage !== usage) {
+        $ERROR((usageValue === undefined ? "Default usage" : "Usage") +
+            " should be " + expectedUsage + ", but is " + usage + ".");
+    }
+}
+
+checkCollation(undefined, undefined, ["default"], "sort");
+
+checkCollation("phonebk", undefined, ["phonebk", "default"], "sort");
+
+checkCollation("invalid", undefined, ["default"], "sort");
+
+checkCollation("standard", undefined, ["default"], "sort");
+
+checkCollation("standard", "search", ["default"], "search");
+
+checkCollation("standard", "sort", ["default"], "sort");
+
+checkCollation("search", undefined, ["default"], "sort");
+
+checkCollation("search", "search", ["default"], "search");
+
+checkCollation("search", "sort", ["default"], "sort");
+