public void OnCancel_Test() { var model = new ProviderFieldEditList { DataPortal.CreateChild<ProviderFieldEdit>(), DataPortal.CreateChild<ProviderFieldEdit>() }; var vm = new SourceFieldsViewModel { Model = model, SelectedProviderField = model.First() }; vm.OnCancel(); Assert.AreSame(model.FirstOrDefault(), vm.SelectedProviderField); }