Capybara assertion helpers for plain Test::Unit folks

capybara_assertions.rb

require 'capybara/session'

# Provider `assert_page_has_X` helpers for all `has_X?` Capybara matchers
#
# For a full list, scope:
# https://github.com/jnicklas/capybara/blob/master/lib/capybara/session.rb
#
module CapybaraAssertions
  Capybara::Session::DSL_METHODS.select { |m| m.to_s.match(/^has/) }.each do |m|
    define_method "assert_page_#{m.to_s.sub(/\?$/, '')}" do |*args|
      human_name = m.to_s.sub(/\?$/, '').sub('has_', 'have_').humanize.downcase
      assert page.send(m, *args), "Expected page to #{human_name} with #{args.inspect}."
    end
  end
end