public void SetRightShift(int rightShift)
        {
            ICaesarSettings settings = new CaesarSettings
            {
                RightShift = rightShift,
            };

            Assert.Equal(rightShift, settings.RightShift);
        }
        public void Construct(int rightShift)
        {
            ICaesarSettings settings = new CaesarSettings()
            {
                RightShift = rightShift
            };

            Assert.Equal(rightShift, settings.RightShift);
        }
        public void SetRightShiftOutOfRange(int rightShift)
        {
            ICaesarSettings settings = new CaesarSettings();

            Assert.Throws <ArgumentOutOfRangeException>(nameof(CaesarSettings.RightShift), () => settings.RightShift = rightShift);
        }