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);
}
