Stubbing the Capybara session for a page object test

I'm using Cucumber with a page object similar to the simplified version shown below. I need to do some quite complex parsing of the HTML, so I'd like to be able to unit test the page object in isolation using RSpec against an HTML fixture, but I'm a bit stuck about to do this. I'm guessing that I need to stub something in Capybara, and pass it in as a dependency?

class SomePage
  def header
    session.find('h1').text
  end
  def title
    session.find('title').text
  end

  开发者_StackOverflowprivate
  def session
    @session ||= Capybara.current_session
  end
end

---

To answer my own question, I discovered Capybara has a #string method which accepts a chunk of HTML and returns a:

Capybara::Node::Simple which exposes all Capybara::Node::Matchers and Capybara::Node::Finders. This allows you to query any string containing HTML in the exact same way you would query the current document in a Capybara session.

So I just added an initializer to my class to allow this node to be passed and used in place of a Capybara session. No stubbing or mocking required, and it does exactly what I need.