@Test
 public void testGetStyle() {
   assertEquals(PlottingStyle.ALL, PlottingStyle.getStyle(null));
   assertEquals(PlottingStyle.ALL, PlottingStyle.getStyle("")); // $NON-NLS-1$
   assertEquals(PlottingStyle.getStyle(PlottingStyle.ALL.toString()), PlottingStyle.ALL);
   assertEquals(PlottingStyle.getStyle(PlottingStyle.NONE.toString()), PlottingStyle.NONE);
   assertEquals(PlottingStyle.getStyle(PlottingStyle.X.toString()), PlottingStyle.X);
   assertEquals(PlottingStyle.getStyle(PlottingStyle.Y.toString()), PlottingStyle.Y);
 }