public void GetMoisPrecedentTest()
        {
            string expected = "02";
            string actual   = GestionDeDates.GetMoisPrecedent();

            Assert.AreEqual(expected, actual);
        }
        public void GetMoisPrecedentTest1()
        {
            string   expected = "01";
            DateTime date     = DateTime.Parse("6/02/2021");
            string   actual   = GestionDeDates.GetMoisPrecedent(date);

            Assert.AreEqual(expected, actual);
        }