public void SetClearValue()
{
using(var form = new Form()) {
var button = new Button();
form.Controls.Add(button);
var viewModel = new TestViewModel() { StringProperty = "test", StringProperty2 = "test2" };
form.SetDataContext(viewModel);
BindingManager manager = new BindingManager();
manager.SetBinding(button, DataContextProvider.DataContextProperty, new Binding(() => viewModel.StringProperty));
manager.SetValue(button, DataContextProvider.DataContextProperty, "value");
Assert.That(button.GetDataContext(), Is.EqualTo("value"));
Assert.That(manager.GetBindingActions().Count(), Is.EqualTo(0));
Assert.That(manager.GetValueActions().Count(), Is.EqualTo(1));
SetValueAction action = manager.GetValueActions().First();
Assert.That(action.Control, Is.EqualTo(button));
Assert.That(((AttachedPropertyDescriptor)action.Property).Property, Is.EqualTo(DataContextProvider.DataContextProperty));
Assert.That(action.Value, Is.EqualTo("value"));
Assert.That(manager.FindAction(button, AttachedPropertyDescriptor.FromAttachedProperty(DataContextProvider.DataContextProperty)), Is.EqualTo(action));
manager.SetValue(button, DataContextProvider.DataContextProperty, "value2");
Assert.That(manager.GetBindingActions().Count(), Is.EqualTo(0));
Assert.That(manager.GetValueActions().Count(), Is.EqualTo(1));
Assert.That(button.GetDataContext(), Is.EqualTo("value2"));
action = manager.GetValueActions().First();
Assert.That(action.Control, Is.EqualTo(button));
Assert.That(((AttachedPropertyDescriptor)action.Property).Property, Is.EqualTo(DataContextProvider.DataContextProperty));
Assert.That(action.Value, Is.EqualTo("value2"));
manager.ClearValue(button, DataContextProvider.DataContextProperty);
Assert.That(manager.GetBindingActions().Count(), Is.EqualTo(0));
Assert.That(manager.GetValueActions().Count(), Is.EqualTo(0));
Assert.That(button.GetDataContext(), Is.Null);
}
}