How to mock Listbox when testing the Presenter class?

Presenter:
public interface Display {
HasText ageTxtBox();
HasClickHandlers incrementButton();
}

View implements Presenter.Display interface:
@UiField Button incrementButton;
@UiField TextBox ageTxtBox;

@Override
public HasText ageTxtBox() {
return ageTxtBox;
}

@Override
public HasClickHandlers incrementButton() {
return incrementButton;
}

How do we do this for a Listbox in a view?

@UiField ListBox listBoxAdmin;

The methods on listBox I am using are:
addItem
getItemCount
getSelectedIndex
getItemText
getValue
removeItem
clear

How can I test my listbox functionality which is in Presenter with a
mock Listbox? What interface it need to implement?

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