Method which will try to validate a block for a given number of seconds. I'm using it when javascript is responsible for loading another page.

FeaturesHelper.rb

  def timeout_expect(seconds=1, &block)
    end_at = Time.now + seconds
    error = nil
    while Time.now < end_at
      begin
        error = nil
        block.call
        end_at = Time.now
      rescue RSpec::Expectations::ExpectationNotMetError => e
        error = e
      end
    end

    raise(RSpec::Expectations::ExpectationNotMetError.new(error.message)) if error
  end