diff -r c370708a2d17 -r 086c60adf08e vmtest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionTest.java
--- a/vmtest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionTest.java	Tue Jan 15 09:00:43 2013 +0100
+++ b/vmtest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionTest.java	Tue Jan 15 09:32:11 2013 +0100
@@ -21,6 +21,8 @@
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import org.apidesign.bck2brwsr.core.JavaScriptBody;
 import org.apidesign.bck2brwsr.vmtest.Compare;
 import org.apidesign.bck2brwsr.vmtest.VMTest;
@@ -118,6 +120,22 @@
     @Compare public String classForByte() throws Exception {
         return Class.forName("[Z").getName();
     }
+
+    @Compare public String classForUnknownArray() {
+        try {
+            return Class.forName("[W").getName();
+        } catch (Exception ex) {
+            return ex.getClass().getName();
+        }
+    }
+    
+    @Compare public String classForUnknownDeepArray() {
+        try {
+            return Class.forName("[[[[[W").getName();
+        } catch (Exception ex) {
+            return ex.getClass().getName();
+        }
+    }
     
     @Compare public String componentGetNameForObjectArray() {
         return (new Object[3]).getClass().getComponentType().getName();