bootstrapper.cs

public class Bootstrapper : DefaultNancyBootstrapper
{
    protected override void ApplicationStartup(TinyIoCContainer container, IPipelines pipelines)
    {
        CookieBasedSessions.Enable(pipelines);
    }
}

SessionTesting.cs

public static class BootstrapperExtensions
{
    public static void WithSession(this IPipelines pipeline, IDictionary<string, object> session)
    {
        pipeline.BeforeRequest.AddItemToEndOfPipeline(ctx =>
        {
            ctx.Request.Session = new Session(session);
            return null;
        });
    }
}


[Fact]
public void TestSession()
{
	var boot = new ConfigurableBootstrapper(with => { with.Module<PagesModule>(); });
	boot.WithSession(new Dictionary<string, object>() { { "key", "value" }, { "number", 2 } });
	var browser = new Browser(boot);

	var response = browser.Get("/Test");


	Assert.NotNull(response.Context.Request.Session);
	Assert.Equal(response.Context.Request.Session["key"], "value");
	Assert.Equal(response.Context.Request.Session["number"], 2);
}