assertFalse(plot1.equals(plot2));
plot2.setOrientation(PlotOrientation.HORIZONTAL);
assertTrue(plot1.equals(plot2));
// axisOffset...
plot1.setAxisOffset(new Spacer(Spacer.ABSOLUTE, 0.05, 0.05, 0.05, 0.05));
assertFalse(plot1.equals(plot2));
plot2.setAxisOffset(new Spacer(Spacer.ABSOLUTE, 0.05, 0.05, 0.05, 0.05));
assertTrue(plot1.equals(plot2));
// domainAxis...
plot1.setDomainAxis(new NumberAxis("Domain Axis"));
assertFalse(plot1.equals(plot2));