/**
* Some tests for the addDomainMarker() method(s).
*/
public void testAddDomainMarker() {
XYPlot plot = new XYPlot();
Marker m = new ValueMarker(1.0);
plot.addDomainMarker(m);
List listeners = Arrays.asList(m.getListeners(
MarkerChangeListener.class));
assertTrue(listeners.contains(plot));
plot.clearDomainMarkers();
listeners = Arrays.asList(m.getListeners(MarkerChangeListener.class));
assertFalse(listeners.contains(plot));
}