public void testGetSetStartValue() {
        IntervalMarker m = new IntervalMarker(1.0, 2.0);
        m.addChangeListener(this);
        this.lastEvent = null;
        assertEquals(1.0, m.getStartValue(), EPSILON);
        m.setStartValue(0.5);
        assertEquals(0.5, m.getStartValue(), EPSILON);
        assertEquals(m, this.lastEvent.getMarker());