public void WhenSetDriveModeGearboxStateChangedToDrive()
        {
            var gearbox      = new Gearbox();
            var leverAdapter = new LeverAdapter(gearbox);

            leverAdapter.SetDriveMode();

            Assert.AreEqual(gearbox.getState(), 1);
        }
        public void WhenSetNeutralModeGearboxStateChangedToNeutral()
        {
            var gearbox      = new Gearbox();
            var leverAdapter = new LeverAdapter(gearbox);

            leverAdapter.SetNeutralMode();

            Assert.AreEqual(gearbox.getState(), 4);
        }