diff -r 8ceee38f5840 -r b107ed66f2e7 vm/src/test/java/org/apidesign/vm4brwsr/Instance.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/Instance.java	Sun Dec 02 21:00:12 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/Instance.java	Mon Jan 14 10:57:51 2013 +0100
@@ -125,4 +125,11 @@
     public static boolean iofObject() {
         return jsObj() instanceof Object;
     }
+    
+    public static int jscall() {
+        return jsgetbytes(new Instance());
+    }
+    
+    @JavaScriptBody(args = { "instance" }, body = "return instance.getByte__B();")
+    private static native int jsgetbytes(Instance instance);
 }