NancyFixture.cs

public class BrowserFixture
{
    private readonly Browser browser;

    public BrowserFixture()
    {
        var bootstrapper = 
            new FakeDefaultNancyBootstrapper();

        this.browser = new Browser(bootstrapper);
    }

    [Fact]
    public void Should_just_work_got_damit()
    {
        // Arrange
        var request = Request.Get("/");
        request.Header("Content-Length", "0");
        request.Header("Accepted-Type", "text/plain");

        // Act
        var response = browser.Process(request);

        // Assert
        response.StatusCode.ShouldEqual(HttpStatusCode.OK);
    }
}