final Counter cnt = new Counter();
MutableOne.DataChangeListener<String> li = new MutableOne.DataChangeListener<String>() {
@Override
public void onDataChange(String old, String one) {
System.out.println("New data -- " + one);
cnt.inc();
}
};
one.addListener(li);
one.updateData("Not yet implemented");
assertTrue(one.removeListener(li));