How to assert number of elements using Capybara with proper error message?

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I know that in Capybara, you can do something like this:

page.should have_css("ol li", :count => 2)

However, assuming that page has for instance only one matching element, the error is not very descriptive:

  1) initial page load shows greetings
 Failure/Error: page.should have_css("ol li", :count => 2)
 expected css "ol li" to return something

Instead of this rather obscure error message, is there a way to write the assertion in such way that error output would be something like 'When matching 'ol li', expected: 2, found: 1'. Obviously I could make a custom logic myself for such a behaviour - I'm asking is there a way to do this 'out of the box'?

For what it's worth, I'm using Selenium driver and RSpec.

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