assertEquals(7, dataset.getItemCount());
assertEquals(null, dataset.getY(0, 6));
assertEquals(2, dataset.getY(1, 6).intValue());
// Remove series 1
dataset.removeSeries(series1);
// Test that there are still 7 X points
assertEquals(7, dataset.getItemCount());
// Remove series 2 and add new series
dataset.removeSeries(series2);