XYSeries s1 = new XYSeries("Series 1", false, true);
s1.add(1.0, 1.0);
s1.add(3.0, 3.0);
s1.add(2.0, 2.0);
assertEquals(0, s1.indexOf(new Double(1.0)));
assertEquals(1, s1.indexOf(new Double(3.0)));
assertEquals(2, s1.indexOf(new Double(2.0)));
}
/**
* A check for the indexOf(Number) method when the series has duplicate