### Question:
ToggleChangeListener implements ChangeListener<T> { public void disabled(boolean disabled) { this.disabled = disabled; }  @Override final void changed(ObservableValue<? extends T> observable, T oldValue, T newValue); void disabled(boolean disabled); boolean disabled(); abstract void onChanged(ObservableValue<? extends T> observable, T oldValue, T newValue);  }### Answer:
@Test public void disabled() { victim.disabled(true); victim.changed(null, null, null); }