public void Simple()
{
var vector = new Vector2D();
var actual = vector.ToString();
Assert.AreEqual("{0,0}", actual);
vector.X = 1;
vector.Y = 2;
actual = vector.ToString();
Assert.AreEqual("{1,2}", actual);
Assert.AreEqual(1, vector.X);
Assert.AreEqual(2, vector.Y);
}