public void WhenRegionManagerChangesToNotNullValue_ThenChildViewsRegionManagerIsNotCleared()
{
var regionManager = new MockRegionManager();
var region = new Region();
region.RegionManager = regionManager;
var behavior = new ClearChildViewsRegionBehavior();
behavior.Region = region;
behavior.Attach();
var childView = new MockFrameworkElement();
region.Add(childView);
childView.SetValue(ClearChildViewsRegionBehavior.ClearChildViewsProperty, true);
Assert.AreEqual(regionManager, childView.GetValue(RegionManager.RegionManagerProperty));
region.RegionManager = new MockRegionManager();
Assert.IsNotNull(childView.GetValue(RegionManager.RegionManagerProperty));
}
public void WhenClearChildViewsPropertyIsTrue_ThenChildViewsRegionManagerIsCleared()
{
var regionManager = new MockRegionManager();
var region = new Region();
region.RegionManager = regionManager;
var behavior = new ClearChildViewsRegionBehavior();
behavior.Region = region;
behavior.Attach();
var childView = new MockFrameworkElement();
region.Add(childView);
ClearChildViewsRegionBehavior.SetClearChildViews(childView, true);
Assert.Equal(regionManager, childView.GetValue(RegionManager.RegionManagerProperty));
region.RegionManager = null;
Assert.Null(childView.GetValue(RegionManager.RegionManagerProperty));
}