assertTrue(plot1.equals(plot2));
// secondary DatasetDomainAxisMap...
plot1.mapDatasetToDomainAxis(11, 11);
assertFalse(plot1.equals(plot2));
plot2.mapDatasetToDomainAxis(11, 11);
assertTrue(plot1.equals(plot2));
// secondaryDatasetRangeAxisMap...
plot1.mapDatasetToRangeAxis(11, 11);
assertFalse(plot1.equals(plot2));