public void SumTest()
{
for (var x = -10; x < 10; x++)
{
for (var y = -10; y < 10; y++)
{
for (var z = -10; z < 10; z++)
{
for (var w = -10; w < 10; w++)
{
var v = new Vector4(x, y, z, w);
Assert.AreEqual(x + y + z + w, v.Sum());
}
}
}
}
}
