Setting up a Stub with Moq

MoqSetupStub.cs

    [TestFixture]
    public class When_loading_the_vehicle_list_and_there_two_available_vehicles : Specification
    {

        protected Mock<IVehicleRepository> _vehicleRepository;
        protected List<Vehicle> _vehicles;
        protected VehicleViewModel _vehicleViewModel;

        protected override void before_each()
        {
            _vehicles = new List<Vehicle>{ new Vehicle(), new Vehicle() };

            _vehicleRepository.Setup(x => x.GetAll()).Returns(_vehicles);
            _vehicleViewModel = new VehicleViewModel(_vehicleRepository.Object);
        }

        [Test]
        public void then_the_vehicles_list_should_have_two_vehicles()
        {
            _vehicleViewModel.VehicleList.Count.Should().Equal(2);
        }
    }