{
JSlider slider1 = new JSlider(JSlider.VERTICAL);
slider1.setBounds(10, 20, 40, 400);
BasicSliderUI ui1 = new BasicSliderUI(slider1);
slider1.setUI(ui1);
harness.check(ui1.valueForYPosition(0), 100);
harness.check(ui1.valueForYPosition(200), 50);
harness.check(ui1.valueForYPosition(400), 0);
harness.check(ui1.valueForYPosition(-50), 100);
harness.check(ui1.valueForYPosition(450), 0);
}