public void CrossProduct()
{
var tuple = Tuple.Vector(1, 2, 3);
var tuple2 = Tuple.Vector(2, 3, 4);
Assert.Equal(Tuple.Vector(-1, 2, -1), VectorOperations.Cross(tuple, tuple2));
Assert.Equal(Tuple.Vector(1, -2, 1), VectorOperations.Cross(tuple2, tuple));
}