How to verify number of records using capybara

I am using capybara along with cucumber on a Rails 2.3.9 project.

I have users index page and I have two records there. Using capybara how do I assert that there are only two records in the page.

HTML structure is like this

<div class='records'>
  <li>record 1<li>
  <li>record 2 </li>
</div>