public void When_StateTrigger_DataBound_Late()
{
var SUT = new UserControl();
var mgr = VisualStateManager.GetVisualStateManager(SUT);
var group = new VisualStateGroup();
var state = new VisualState();
group.States.Add(state);
var trigger = new StateTrigger();
trigger.SetBinding(StateTrigger.IsActiveProperty, new Binding()
{
Path = "a"
});
var groups = new List <VisualStateGroup>();
groups.Add(group);
state.StateTriggers.Add(trigger);
VisualStateManager.SetVisualStateGroups(SUT, groups);
Assert.IsNull(trigger.DataContext);
Assert.IsFalse(trigger.IsActive);
SUT.DataContext = new { a = true };
Assert.IsNotNull(group.DataContext);
Assert.IsNotNull(state.DataContext);
Assert.IsNotNull(trigger.DataContext);
Assert.IsTrue(trigger.IsActive);
}