public void RemoveInstanceShouldRemoveAllValidatorsAssociatedWithInstance()
{
ValidatableViewModel viewModel = GetValidatableViewModel();
ValidatorProvider.Register <SpyValidator>();
var instance = new object();
var instance2 = new object();
viewModel.AddInstance(instance);
viewModel.AddInstance(instance2);
viewModel.AddValidator <ManualValidator>(instance);
viewModel.GetValidators().Count.ShouldEqual(4);
viewModel.RemoveInstance(instance);
viewModel.GetValidators().Single(validator => validator != viewModel.Validator).Context.Instance.ShouldEqual(instance2);
}