public void ProduceLagrange_Test()
{
var plotter = new Plotter();
DataPoint[] dataPoints = new DataPoint[3];
dataPoints[0] = new DataPoint(0, 15);
dataPoints[1] = new DataPoint(10, 3);
dataPoints[2] = new DataPoint(20, 30);
var function = plotter.CreatePolynomialThroughPoints(dataPoints);
Assert.AreEqual(15d, function.Calculate(0), 0);
}