public void CreateScale()
{
Matrix22D i = Matrix22D.CreateScale(1.0);
Assert.AreEqual(Matrix22D.Identity, i);
Vector2D v = Vector2D.One;
Matrix22D m = Matrix22D.CreateScale(2.0);
Assert.AreEqual(2 * v, m * v);
m = Matrix22D.CreateScale(-1.0, 1.5);
Assert.AreEqual(new Vector2D(-1.0, 1.5), m * v);
Vector2D scale = new Vector2D(-2.0, -3.0);
m = Matrix22D.CreateScale(scale);
v = new Vector2D(1.0, 2.0);
Assert.AreEqual(v * scale, m * v);
}