gistfile1.cs

    public class Mutations
    {
        readonly BrowserSession session;

        public Mutations(BrowserSession session)
        {
            this.session = session;
        }

        public Action ClickOnAnElement(string css, int ms = 200)
        {
            return () => session.FindCss(css, ms == 0 ? null : new Options() { Timeout = TimeSpan.FromMilliseconds(ms) });
        }
    }

  
    public class Postconditions
    {
        readonly BrowserSession session;

        public Postconditions(BrowserSession session)
        {
            this.session = session;
        }

        public Action None = () => { };


        public Action ShouldHaveCss(string selector, int ms = 200)
        {
            return () => session.HasCss(selector, ms == 0 ? null : new Options() { Timeout = TimeSpan.FromMilliseconds(ms) });
        }
    }


    public static class InteractionExtensions
    {
        public class Interaction
        {
            public BrowserSession session;
            public Action Mutation;
            public Action PostCondition;

            public Interaction(BrowserSession session,Action mutation,Action postcondition)
            {
                this.session = session;
                Mutation = mutation;
                PostCondition = postcondition;
            }

            public void Execute()
            {
                session.RetryUntilTimeout(() =>
                {
                    Mutation();
                    PostCondition();
                });
            }
        }


        public static void Interact(this BrowserSession session, Func<Mutations,Action> mutation,Func<Postconditions,Action> postcondition)
        {
            var interaction = new Interaction(session,
                mutation(new Mutations(session)),
                postcondition(new Postconditions(session)));
            
            interaction.Execute();
        }

        public static void Syntax()
        {
            var session = new BrowserSession();

            session.Interact(when => when.ClickOnAnElement(".some.thing"),
                             then => then.ShouldHaveCss(".something.happened.we.can.see"));

        }
    }