public void Multiplication_parametre_negative_negative()
        {
            CalculSimple cs     = new CalculSimple(stubAuthentification);
            var          Result = cs.MultiplicationSimple(-5, -5);

            Assert.AreEqual(25, Result);
        }
        public void Multiplication_parametre_positive_null()
        {
            CalculSimple cs     = new CalculSimple(stubAuthentification);
            var          Result = cs.MultiplicationSimple(5, 0);

            Assert.AreEqual(0, Result);
        }