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diff --git a/test/suite/intl402/ch09/9.2/9.2.1_4.js b/test/suite/intl402/ch09/9.2/9.2.1_4.js
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index 000000000..b9bb9db79
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+++ b/test/suite/intl402/ch09/9.2/9.2.1_4.js
@@ -0,0 +1,46 @@
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @description Tests that non-objects are converted to objects before canonicalization.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+testWithIntlConstructors(function (Constructor) {
+    // undefined is handled separately
+    
+    // null should result in a TypeError
+    var error;
+    try {
+        var supportedForNull = Constructor.supportedLocalesOf(null);
+    } catch (e) {
+        error = e;
+    }
+    if (error === undefined) {
+        $ERROR("Null as locale list was not rejected.");
+    } else if (error.name !== "TypeError") {
+        $ERROR("Null as locale list was rejected with wrong error " + error.name + ".");
+    }    
+    
+    // let's use an empty list for comparison
+    var supportedForEmptyList = Constructor.supportedLocalesOf([]);
+    // we don't compare the elements because length should be 0 - let's just verify that
+    if (supportedForEmptyList.length !== 0) {
+        $ERROR("Internal test error: Assumption about length being 0 is invalid.");
+    }
+
+    // most non-objects will be interpreted as empty lists because a missing length property is interpreted as 0
+    var supportedForNumber = Constructor.supportedLocalesOf(5);
+    if (supportedForNumber.length !== supportedForEmptyList.length) {
+        $ERROR("Supported locales differ between numeric and empty list input.");
+    }
+    var supportedForBoolean = Constructor.supportedLocalesOf(true);
+    if (supportedForBoolean.length !== supportedForEmptyList.length) {
+        $ERROR("Supported locales differ between boolean and empty list input.");
+    }
+    
+    return true;
+});
+