diff -r bb1e59f5cff3 -r 6193e735f4d1 rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java
--- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Sat Oct 05 07:23:48 2013 +0200
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Fri Oct 11 09:58:03 2013 +0200
@@ -24,23 +24,33 @@
 import java.net.URL;
 import java.util.Enumeration;
 import javax.script.Invocable;
+import javax.script.ScriptContext;
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineManager;
 import javax.script.ScriptException;
 import static org.testng.Assert.*;
 
-final class TestVM {
+public final class TestVM {
     private final Invocable code;
     private final CharSequence codeSeq;
     private final Object bck2brwsr;
+    private BytesLoader resources;
     
     
     private TestVM(Invocable code, CharSequence codeSeq) throws ScriptException, NoSuchMethodException {
         this.code = code;
         this.codeSeq = codeSeq;
-        this.bck2brwsr = code.invokeFunction("bck2brwsr");
+        this.bck2brwsr = ((ScriptEngine)code).eval("bck2brwsr(function(n) { return loader.get(n); })");
+        ((ScriptEngine)code).getContext().setAttribute("loader", this, ScriptContext.ENGINE_SCOPE);
     }
     
+    public void register(BytesLoader res) {
+        this.resources = res;
+    }
+    
+    public byte[] get(String res) throws IOException {
+        return resources != null ? resources.get(res) : null;
+    }
 
     public Object execCode(
         String msg, Class<?> clazz, String method,