public void DivideTupleByScalar()
{
var v1 = new Tuple <double, double, double, double>(1, -2, 3, -4);
var expected = new Tuple <double, double, double, double>(0.5, -1, 1.5, -2);
var neg = PointType.DivideTuple(v1, 2);
Assert.Equal(expected, neg);
}