public void AddingTwoTuples()
{
var a1 = new Tuple <double, double, double, double>(3, -2, 5, 1);
var a2 = new Tuple <double, double, double, double>(-2, 3, 1, 0);
var expected = new Tuple <double, double, double, double>(1, 1, 6, 1);
Assert.Equal(expected, PointType.AddTuple(a1, a2));
}