public void FindVehicleTest()
        {
            Mock <IVehicle> mock = new Mock <IVehicle>();

            mock.Setup(v => v.LicensePlate).Returns("VT2002VT");

            VehicleParkCommands testObject = new VehicleParkCommands();
            //If the owner is not given
            var result = testObject.FindVehicle("VT2002VT", new List <Mock <IVehicle> >()
            {
                mock
            });

            Assert.AreEqual(result, "VT2002VT");
        }