public void Minus_Operator()
{
var vector1 = new Vector3(2.0f, 3.0f, 4.0f);
var vector2 = new Vector3(5.0f, 6.0f, 7.0f);
var result = vector1 - vector2;
Assert.AreEqual(vector1.X - vector2.X, result.X);
Assert.AreEqual(vector1.Y - vector2.Y, result.Y);
Assert.AreEqual(vector1.Z - vector2.Z, result.Z);
}