diff -r 000000000000 -r 99f832e5765f src/test/java/org/apidesign/java4browser/InstanceSub.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test/java/org/apidesign/java4browser/InstanceSub.java	Wed Sep 19 19:57:45 2012 +0200
@@ -0,0 +1,20 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.apidesign.java4browser;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public class InstanceSub extends Instance {
+    public InstanceSub(int i, double d) {
+        super(i, d);
+    }
+    
+    @Override
+    public void setByte(byte b) {
+        super.setByte((byte) (b + 1));
+    }
+}