capybara_test.rb

# gem install capybara --pre
# gem install rspec
# rspec capybara_test.rb

require 'rubygems'
require 'capybara'
require 'capybara/rspec'

Capybara.configure do |c|
  c.current_driver = :selenium
end

feature 'signing up' do
  scenario "Signing in with incorrect credentials" do
    visit('http://signin.ebay.com')

    fill_in 'User ID', :with => 'user@example.com'
    fill_in 'Password', :with => 'caplin'

    click_button 'Sign in'

    page.should have_content('Your user ID or password is incorrect.')
  end
end