public void ShouldRemoveContextToViewRemovedFromRegion()
        {
            var behavior = new BindRegionContextToDependencyObjectBehavior();
            var region = new MockPresentationRegion();
            var view = new MockDependencyObject();
            region.Add(view);
            behavior.Region = region;
            region.Context = "MyContext";
            behavior.Attach();

            region.Remove(view);

            var context = RegionContext.GetObservableContext(view);
            Assert.IsNull(context.Value);
        }
        public async Task WhenAViewIsRemovedFromARegion_ThenRegionContextIsNotClearedInRegion()
        {
            await ExecuteOnUIThread(() =>
                {
                    var behavior = new BindRegionContextToDependencyObjectBehavior();
                    var region = new MockPresentationRegion();

                    behavior.Region = region;
                    behavior.Attach();

                    var myView = new MockFrameworkElement();

                    region.Add(myView);
                    region.Context = "new context";

                    region.Remove(myView);

                    Assert.IsNotNull(region.Context);
                });
        }