public void Dispose_UnregisterFromEvents()
{
selectionServiceMock.SetupRemove(m => m.SelectionChanged -= (sender, args) => { });
testSubject.Dispose();
selectionServiceMock.VerifyRemove(x => x.SelectionChanged -= It.IsAny <EventHandler <SelectionChangedEventArgs> >(), Times.Once);
selectionServiceMock.VerifyNoOtherCalls();
}
