public void TestOperator_Subtraction_i ()
{
var a = new Vector2(12, -4);
var b = new Vector2(15, 11);
var expected = new Vector2(-3, -15);
this.TestSubtraction(a, b, expected);
var c = new Vector2(-423, 342);
this.TestSubtraction(c, Vector2.Zero, c);
}