private void NewViewModel()
 {
     _context   = new ModelContext();
     _model     = new SetupModel(_context);
     _viewModel = new SetupViewModel(_model, _context);
     _viewModel.RefreshPage();
 }
        public void RefreshPage()
        {
            NewViewModel();
            _context.Group1Name = "test";
            _context.Group2Name = "test2";
            _context.TotalSize  = 20;

            _viewModel.RefreshPage();
            Assert.AreEqual("test", _viewModel.Group1Name);
            Assert.AreEqual("test2", _viewModel.Group2Name);
            Assert.AreEqual(20, _viewModel.ParticipantNumber);
        }