assertTrue(plot1.equals(plot2));
// secondaryDatasetRangeAxisMap...
plot1.mapDatasetToRangeAxis(11, 11);
assertFalse(plot1.equals(plot2));
plot2.mapDatasetToRangeAxis(11, 11);
assertTrue(plot1.equals(plot2));
// renderer
plot1.setRenderer(new DefaultXYItemRenderer());
assertFalse(plot1.equals(plot2));