diff -r 002b7c3d5157 -r eea0065bcc1a vm/src/test/java/org/apidesign/vm4brwsr/Classes.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/Classes.java	Wed Dec 19 16:43:37 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/Classes.java	Thu Dec 20 08:59:47 2012 +0100
@@ -38,6 +38,10 @@
         return c.getName();
     }
     
+    public static boolean isInterface(String s) throws ClassNotFoundException {
+        return Class.forName(s).isInterface();
+    }
+    
     public static boolean equalsClassesOfExceptions() {
         return MalformedURLException.class.getSuperclass() == IOException.class;
     }
@@ -95,9 +99,12 @@
     public static int primitive() {
         return 1;
     }
+    public static boolean primitiveB() {
+        return true;
+    }
     
-    public static String primitiveType() throws Exception {
-        return reflectiveMethodCall(false, "primitive").getClass().getName();
+    public static String primitiveType(String method) throws Exception {
+        return reflectiveMethodCall(false, method).getClass().getName();
     }
     
     @JavaScriptBody(args = "msg", body = "throw msg;")