diff -r 752f48257d4a -r a6f807104d8e rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java
--- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Wed May 28 10:47:18 2014 +0200
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Wed May 28 13:38:29 2014 +0200
@@ -147,6 +147,12 @@
         StringBuilder sb, ScriptEngine[] eng, 
         String name, final String resourceName, final String resourceContent
     ) throws ScriptException, IOException {
+        return compileClassesAsExtension(sb, eng, resourceName, resourceContent, name);
+    }
+    static TestVM compileClassesAsExtension(
+        StringBuilder sb, ScriptEngine[] eng, 
+        final String resourceName, final String resourceContent, String... names
+    ) throws ScriptException, IOException {
         if (sb == null) {
             sb = new StringBuilder();
         }
@@ -166,8 +172,9 @@
                     return super.get(name);
                 }
             }).
-            addRootClasses(name).
+            addClasses(names).
             addResources("org/apidesign/vm4brwsr/obj.js").
+            addExported("org/apidesign/vm4brwsr/").
             obfuscation(ObfuscationLevel.FULL).
             library();
         if (resourceName != null) {