public void testSeriesRename() {
// first check that a valid renaming works
XYSeries series1 = new XYSeries("A");
XYSeries series2 = new XYSeries("B");
XYSeriesCollection collection = new XYSeriesCollection();
collection.addSeries(series1);
collection.addSeries(series2);
series1.setKey("C");
assertEquals("C", collection.getSeries(0).getKey());
// next, check that setting a duplicate key fails