Testing MVVMCross MvxCommands

I have a MvxViewModel with three commands, two of which change the view model and the third provides navigation. I have a method of testing the navigation as discussed in this blog post but I am struggling to find a method of testing the GetClubsCommand and ClubItemSelectionCommand commands

ViewModel snippet

    public ICommand GetClubsCommand
    {
        get { return new MvxCommand(() => Task.Run(async () => await GetClubs())); }

    }

    public ICommand ConfirmClubSelectionCommand
    {
        get { return new MvxCommand(() => ShowViewModel<LogonViewModel>(SelectedClub)); }
    }

    public ICommand ClubItemSelectionCommand
    {
        get { return new MvxCommand<ClubDto>(c => SetSelectedItem(c)); }
    }

Tests

    [Test]
    public void GetClubsCommand()
    {
        var dataServiceMock = Mock.Create<IClubDataService>();
        Mock.Arrange(() => dataServiceMock.GetClubs(Arg.AnyString))
                  .Returns(() => GetClubs());
        ClubSelectionViewModel vm = new ClubSelectionViewModel(dataServiceMock);

        //Act
        vm.GetClubsCommand.Execute(null);

        //Assert
        Assert.IsNotNull(vm.Clubs);
    }

    [Test]
    public void SetClubItemSelectionCommand()
    {
        var dataServiceMock = Mock.Create<IClubDataService>();
        Mock.Arrange(() => dataServiceMock.GetClubs(Arg.AnyString))
                  .Returns(() => GetClubs());
        ClubSelectionViewModel vm = new ClubSelectionViewModel(dataServiceMock);

        //Act
        vm.ClubItemSelectionCommand.Execute(null);

        //Assert
        Assert.IsNotNull(vm.SelectedClub);
    }

When I run the above tests they fail on the construction of the MvxCommand.

System.NullReferenceException : Object reference not set to an instance of an object.

at xxx.Members.Core.ViewModels.ClubSelectionViewModel.SetSelectedItem(ClubDto club) in Y:\Documents\Development\Projects\xxx\xxx.Members\ViewModels\ClubSelectionViewModel.cs:line 69
   at xxx.Members.Core.ViewModels.ClubSelectionViewModel.<get_ClubItemSelectionCommand>b__23_0(ClubDto c) in Y:\Documents\Development\Projects\xxx\xxx.Members\ViewModels\ClubSelectionViewModel.cs:line 63
   at Cirrious.MvvmCross.ViewModels.MvxCommand`1.Execute(Object parameter)
   at xxx.Members.Core.Tests.ClubSelectionViewModelTests.SetClubItemSelectionCommand() in Y:\Documents\Development\Projects\xxx\UnitTests\xxx.Members.Core.Tests\ClubSelectionViewModelTests.cs:line 148

IS there a recommended method of unit testing the MvxCommand in this case?