public void SEQChangerCouleurStylo()
{
i = new ModeSequentiel();
int testFormeLibre = -1;
i.ColorierStylo(255, 0, 0);
i.DescendreStylo();
i.AvancerStylo(50);
testFormeLibre = i.LeverStylo();
Assert.AreNotEqual(-1, testFormeLibre);
i.Afficher(displayTime);
}