public void IsFirstEvenTwo()
        {
            Even num = new Even(1);

            Assert.IsTrue(2 == num.EvenList()[0]);
        }
        public void IsFifthEvenTen()
        {
            Even num = new Even(5);

            Assert.IsTrue(10 == num.EvenList()[4]);
        }
        public void IsEvenListCorrectLength()
        {
            Even num = new Even(5);

            Assert.IsTrue(5 == num.EvenList().Count);
        }