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

rspec dsl capybara
merryprankster picture merryprankster · Jul 18, 2011 · Viewed 42.2k times · Source

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.

Answer

pandaPowder picture pandaPowder · Jun 10, 2013

I like this much better.

expect(page).to have_selector('input', count: 12)

https://github.com/jnicklas/capybara/blob/415e2db70d3b19b46a4d3d0fe62f50400f9d2b61/spec/rspec/matchers_spec.rb

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