* Some checks for the clear() method.
*/
public void testClear() {
OHLCSeries s1 = new OHLCSeries("S1");
s1.addChangeListener(this);
s1.clear();
assertNull(this.lastEvent);
assertTrue(s1.isEmpty());
s1.add(new Year(2006), 1.0, 1.1, 1.1, 1.1);
assertFalse(s1.isEmpty());
s1.clear();