Sample test for an exception thrown from DynamicData. The test passes but the error is displayed in the output.

ChangeTest.cs

    using System;

    using DynamicData;
    using DynamicData.Binding;

using NUnit.Framework;

[TestFixture]
public class DynamicDataTest
{
    [Test]
    public void TransformToNull()
    {
        var data = new Data { Id = 1, State = null };
        var cache = new SourceCache<Data, int>(d => d.Id);
        var items = new ObservableCollectionExtended<string>();
        var subscription = cache.Connect()
                                .Transform(d => d.State)
                                .Bind(items)
                                .Subscribe(_ => { }, e => Console.WriteLine($"Error: {e.Message}"));

        cache.AddOrUpdate(data);
        data.State = "Changed";
        cache.AddOrUpdate(data);

        subscription.Dispose();
    }

    private class Data
    {
        public int Id { get; set; }

        public string State { get; set; }
    }
}