public void MustShowVeuillezVerifierLaValiditeDesParametresPassesDeuxParametres()
        {
            Init();
            // arrange
            string expected = "Veuillez vérifier la validité des paramètres passés.";

            IAction action = new Sub(Writer);

            string[] args = new string[] {
                "Sub",
                "5"
            };

            // act
            action.Action(args);

            //assert
            Assert.Equal(expected, Lines[0]);
        }
        public void MustShowLeResultatEst2()
        {
            Init();
            // arrange
            string expected = "Le résultat est : 2";

            IAction action = new Sub(Writer);

            string[] args = new string[] {
                "Sub",
                "5",
                "3"
            };

            // act
            action.Action(args);

            //assert
            Assert.Equal(expected, Lines[0]);
        }