Inheritance: IDependencyObjectReceiver, IDisposable
        public void FileDropMonitorShouldOnlyUseUiElement()
        {
            var monitor = new FileDropMonitor();

            monitor.Receive(new DependencyObject());

            monitor.Dropped.Should().BeOfType<Subject<FileInfo>>();

            ((Subject<FileInfo>)monitor.Dropped).HasObservers.Should().Be(false);
        }
        public void FileDropMonitorShouldHandleNull()
        {
            var monitor = new FileDropMonitor();

            monitor.Receive(null);
        }