diff -r c3e68a67d46d -r 4b43ab1f72e8 rt/vm/src/test/java/org/apidesign/vm4brwsr/HtmlAnnotationsTest.java
--- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/HtmlAnnotationsTest.java	Thu Jul 11 22:36:01 2013 +0200
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/HtmlAnnotationsTest.java	Fri Jul 12 11:07:58 2013 +0200
@@ -17,6 +17,7 @@
  */
 package org.apidesign.vm4brwsr;
 
+import static org.testng.Assert.assertNotNull;
 import org.testng.annotations.AfterClass;
 import org.testng.annotations.BeforeClass;
 import org.testng.annotations.Test;
@@ -54,6 +55,15 @@
             Double.valueOf(1)
         );
     }
+
+    @Test public void callbackWithFourParamsAndReturnType() throws Exception {
+        Object instance = code.execCode("Get an HtmlAnnotations instance", HtmlAnnotations.class, "create__Ljava_lang_Object_2", null);
+        assertNotNull(instance, "Instance created");
+        assertExec("runnable called", HtmlAnnotations.class, 
+            "first__JLjava_lang_Object_2JJ",
+            Double.valueOf(42), instance, 42, 31
+        );
+    }
     
     private static TestVM code;