= Capybara * http://github.com/jnicklas/capybara == Description: Capybara aims to simplify the process of integration testing Rack applications, such as Rails, Sinatra or Merb. Capybara simulates how a real user would interact with a web application. It is agnostic about the driver running your tests and currently comes with Rack::Test and Selenium support built in. HtmlUnit and env.js are supported through external gems. A complete reference is available at {at rubydoc.info}[http://rubydoc.info/github/jnicklas/capybara/master]. == Install: Install as a gem: sudo gem install capybara On OSX you may have to install libffi, you can install it via MacPorts with: sudo port install libffi == Development: * Source hosted at {GitHub}[http://github.com/jnicklas/capybara]. * Please direct questions, discussions at the {mailing list}[http://groups.google.com/group/ruby-capybara]. * Report issues on {GitHub Issues}[http://github.com/jnicklas/capybara/issues] Pull requests are very welcome! Make sure your patches are well tested, Capybara is a testing tool after all. Please create a topic branch for every separate change you make. Capybara uses bundler in development. To set up a development environment, simply do: git submodule update --init gem install bundler --pre bundle install == Using Capybara with Cucumber Capybara is built to work nicely with Cucumber. Support for Capybara is built into cucumber-rails. In your Rails app, just run: rails generate cucumber:install --capybara And everything should be set up and ready to go. If you want to use Capybara with Cucumber outside Rails (for example with Merb or Sinatra), you'll need to require Capybara and set the Rack app manually: require 'capybara/cucumber' Capybara.app = MyRackApp Now you can use it in your steps: When /I sign in/ do within("#session") do fill_in 'Login', :with => 'user@example.com' fill_in 'Password', :with => 'password' end click_link 'Sign in' end Capybara sets up some {tags}[http://wiki.github.com/aslakhellesoy/cucumber/tags] for you to use in Cucumber. Often you'll want to run only some scenarios with a driver that supports JavaScript, Capybara makes this easy: simply tag the scenario (or feature) with @javascript: @javascript Scenario: do something Ajaxy When I click the Ajax link ... You can change which driver Capybara uses for JavaScript: Capybara.javascript_driver = :culerity There are also explicit @selenium, @culerity and @rack_test tags set up for you. == Using Capybara with RSpec If you prefer RSpec to using Cucumber, you can use the built in RSpec support by adding the following line (typically to your spec_helper.rb file): require 'capybara/rspec' You can now use it in your examples: describe "the signup process", :type => :request do before :each do User.make(:email => 'user@example.com', :password => 'caplin') end it "signs me in" do within("#session") do fill_in 'Login', :with => 'user@example.com' fill_in 'Password', :with => 'password' end click_link 'Sign in' end end Capybara is only included for examples with :type => :request (or :acceptance for compatibility). If you use the rspec-rails gem, :type => :request is automatically set on all files under spec/requests. Essentially, these are Capybara-enhanced Rails request specs, so it's a good idea to place your Capybara specs here because within request specs you gain a few additional features, such as the ability to refer to named route helpers. If you do not need these, then you may simply use spec/acceptance and you will still get access to Capybara methods. RSpec's metadata feature can be used to switch to a different driver. Use :js => true to switch to the javascript driver, or provide a :driver option to switch to one specific driver. For example: describe 'some stuff which requires js', :js => true do it 'will use the default js driver' it 'will switch to one specific driver', :driver => :celerity end Capybara also comes with a built in DSL for creating descriptive acceptance tests: feature "Signing up" do background do User.make(:email => 'user@example.com', :password => 'caplin') end scenario "Signing in with correct credentials" do within("#session") do fill_in 'Login', :with => 'user@example.com' fill_in 'Password', :with => 'caplin' end click_link 'Sign in' end end Essentially, this is just a shortcut for making a request spec, where feature is a shortcut for describe ..., :type => :request, background is an alias for before :each, and scenario is an alias for it/example. Again, you are encouraged to place these within spec/requests rather than spec/acceptance. Note that Capybara's built in RSpec support only works with RSpec 2.0 or later. You'll need to roll your own for earlier versions of RSpec. == Using Capybara with Test::Unit To use Capybara with Test::Unit, include the DSL (include Capybara up until version 0.4.x, include Capybara::DSL for newer versions) in whatever test class you are using. For example, if your classes derive from ActionDispatch::IntegrationTest, use class ActionDispatch::IntegrationTest include Capybara::DSL end Test::Unit does not support selecting the driver through test metadata, but you can switch the driver for specific classes using the setup and teardown methods. See the section "Selecting the Driver". == Using Capybara with Ruby on Rails If you are using the Rails framework, add this line to automatically configure Capybara to test against your Rails application: require 'capybara/rails' == Using Capybara with Rack If you're using Capybara with a non-Rails Rack application, set Capybara.app to your application class: Capybara.app = MyRackApp == Drivers Capybara uses the same DSL to drive a variety of browser and headless drivers. === Selecting the Driver By default, Capybara uses the :rack_test driver, which is fast but does not support JavaScript. You can set up a different default driver for your features. For example if you'd prefer to run everything in Selenium, you could do: Capybara.default_driver = :selenium However, if you are using RSpec or Cucumber, you may instead want to consider leaving the faster :rack_test as the +default_driver+, and marking only those tests that require a JavaScript-capable driver using :js => true or @javascript, respectively. By default, JavaScript tests are run using the :selenium driver. You can change this by setting Capybara.javascript_driver. You can also change the driver temporarily (typically in the Before/setup and After/teardown blocks): Capybara.current_driver = :culerity # temporarily select different driver ... tests ... Capybara.use_default_driver # switch back to default driver Note that switching the driver creates a new session, so you may not be able to switch in the middle of a test. === RackTest RackTest is Capybara's default driver. It is written in pure Ruby and does not have any support for executing JavaScript. Since the RackTest driver works directly agains the Rack interface, it does not need any server to be started, it can work directly work against any Rack app. This means that if your application is not a Rack application (Rails, Sinatra and most other Ruby frameworks are Rack applications) then you cannot use this driver. You cannot use the RackTest driver to test a remote application. {capybara-mechanize}[https://github.com/jeroenvandijk/capybara-mechanize] intends to provide a similar driver which works against remote servers, it is a separate project. RackTest can be configured with a set of headers like this: Capybara.register_driver :rack_test do |app| Capybara::RackTest::Driver.new(app, :browser => :chrome) end See the section on adding and configuring drivers. === Selenium At the moment, Capybara supports {Selenium 2.0 (Webdriver)}[http://seleniumhq.org/docs/01_introducing_selenium.html#selenium-2-aka-selenium-webdriver], *not* Selenium RC. Provided Firefox is installed, everything is set up for you, and you should be able to start using Selenium right away. By default Capybara tries to synchronize Ajax requests, so it will wait for Ajax requests to finish after you've interacted with the page. You can switch off this behaviour by setting the driver option :resynchronize to false. See the section on configuring drivers. Note: Selenium does not support transactional fixtures; see the section "Transactional Fixtures" below. === HtmlUnit There are three different drivers, maintained as external gems, that you can use to drive {HtmlUnit}[http://htmlunit.sourceforge.net/]: * {Akephalos}[https://github.com/bernerdschaefer/akephalos] might be the best HtmlUnit driver right now. * {Celerity}[https://github.com/sobrinho/capybara-celerity] only runs on JRuby, so you'll need to install the celerity gem under JRuby: jruby -S gem install celerity * {Culerity}[https://github.com/sobrinho/capybara-culerity]: Install celerity as noted above, and make sure that JRuby is in your path. Note that Culerity does not seem to be working under Ruby 1.9 at the moment. Note: HtmlUnit does not support transactional fixtures; see the section "Transactional Fixtures" below. === env.js The {capybara-envjs driver}[http://github.com/smparkes/capybara-envjs] uses the envjs gem ({GitHub}[http://github.com/smparkes/env-js], {rubygems.org}[http://rubygems.org/gems/envjs]) to interpret JavaScript outside the browser. The driver is installed by installing the capybara-envjs gem: gem install capybara-envjs More info about the driver and env.js are available through the links above. The envjs gem only supports Ruby 1.8.7 at this time. Note: Envjs does not support transactional fixtures; see the section "Transactional Fixtures" below. == The DSL Capybara's DSL (domain-specific language) is inspired by Webrat. While backwards compatibility is retained in a lot of cases, there are certain important differences. Unlike in Webrat, all searches in Capybara are *case sensitive*. This is because Capybara heavily uses XPath, which doesn't support case insensitivity. === Navigating You can use the {visit}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Session#visit-instance_method] method to navigate to other pages: visit('/projects') visit(post_comments_path(post)) The visit method only takes a single parameter, the request method is *always* GET. You can get the {current path}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Session#current_path-instance_method] of the browsing session for test assertions: current_path.should == post_comments_path(post) === Clicking links and buttons Full reference: {Capybara::Node::Actions}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Node/Actions] You can interact with the webapp by following links and buttons. Capybara automatically follows any redirects, and submits forms associated with buttons. click_link('id-of-link') click_link('Link Text') click_button('Save') click_on('Link Text') # clicks on either links or buttons click_on('Button Value') === Interacting with forms Full reference: {Capybara::Node::Actions}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Node/Actions] There are a number of tools for interacting with form elements: fill_in('First Name', :with => 'John') fill_in('Password', :with => 'Seekrit') fill_in('Description', :with => 'Really Long Text...') choose('A Radio Button') check('A Checkbox') uncheck('A Checkbox') attach_file('Image', '/path/to/image.jpg') select('Option', :from => 'Select Box') === Querying Full reference: {Capybara::Node::Matchers}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Node/Matchers] Capybara has a rich set of options for querying the page for the existence of certain elements, and working with and manipulating those elements. page.has_selector?('table tr') page.has_selector?(:xpath, '//table/tr') page.has_no_selector?(:content) page.has_xpath?('//table/tr') page.has_css?('table tr.foo') page.has_content?('foo') You can use these with RSpec's magic matchers: page.should have_selector('table tr') page.should have_selector(:xpath, '//table/tr') page.should have_no_selector(:content) page.should have_xpath('//table/tr') page.should have_css('table tr.foo') page.should have_content('foo') page.should have_no_content('foo') Note that page.should have_no_xpath is preferred over page.should_not have_xpath. Read the section on asynchronous JavaScript for an explanation. If all else fails, you can also use the {page.html}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Session#html-instance_method] method to test against the raw HTML: page.html.should match /.../i === Finding Full reference: {Capybara::Node::Finders}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Node/Finders] You can also find specific elements, in order to manipulate them: find_field('First Name').value find_link('Hello').visible? find_button('Send').click find(:xpath, "//table/tr").click find("#overlay").find("h1").click all('a').each { |a| a[:href] } Note that find will wait for an element to appear on the page, as explained in the Ajax section. If the element does not appear it will raise an error. These elements all have all the Capybara DSL methods available, so you can restrict them to specific parts of the page: find('#navigation').click_link('Home') find('#navigation').should have_button('Sign out') === Scoping Capybara makes it possible to restrict certain actions, such as interacting with forms or clicking links and buttons, to within a specific area of the page. For this purpose you can use the generic {within}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Session#within-instance_method] method. Optionally you can specify which kind of selector to use. within("li#employee") do fill_in 'Name', :with => 'Jimmy' end within(:xpath, "//li[@id='employee']") do fill_in 'Name', :with => 'Jimmy' end There are special methods for restricting the scope to a specific fieldset, identified by either an id or the text of the fieldet's legend tag, and to a specific table, identified by either id or text of the table's caption tag. within_fieldset('Employee') do fill_in 'Name', :with => 'Jimmy' end within_table('Employee') do fill_in 'Name', :with => 'Jimmy' end === Scripting In drivers which support it, you can easily execute JavaScript: page.execute_script("$('body').empty()") For simple expressions, you can return the result of the script. Note that this may break with more complicated expressions: result = page.evaluate_script('4 + 4'); === Debugging It can be useful to take a snapshot of the page as it currently is and take a look at it: save_and_open_page == Transactional fixtures Transactional fixtures only work in the default Rack::Test driver, but not for other drivers like Selenium. Cucumber takes care of this automatically, but with Test::Unit or RSpec, you may have to use the {database_cleaner}[https://github.com/bmabey/database_cleaner] gem. See {this explanation}[https://groups.google.com/d/msg/ruby-capybara/JI6JrirL9gM/R6YiXj4gi_UJ] (and code for {solution 2}[http://opinionated-programmer.com/2011/02/capybara-and-selenium-with-rspec-and-rails-3/#comment-220] and {solution 3}[http://pastie.org/1745020]) for details. == Asynchronous JavaScript (Ajax and friends) When working with asynchronous JavaScript, you might come across situations where you are attempting to interact with an element which is not yet present on the page. Capybara automatically deals with this by waiting for elements to appear on the page. When issuing instructions to the DSL such as: click_link('foo') click_link('bar') page.should have_content('baz') If clicking on the *foo* link causes triggers an asynchronous process, such as an Ajax request, which, when complete will add the *bar* link to the page, clicking on the *bar* link would be expeced to fail, since that link doesn't exist yet. However Capybara is smart enought to retry finding the link for a brief period of time before giving up and throwing an error. The same is true of the next line, which looks for the content *baz* on the page; it will retry looking for that content for a brief time. You can adjust how long this period is (the default is 2 seconds): Capybara.default_wait_time = 5 Be aware that because of this behaviour, the following two statements are *not* equivalent, and you should *always* use the latter! page.should_not have_xpath('a') page.should have_no_xpath('a') The former would incorrectly wait for the content to appear, since the asynchronous process has not yet removed the element from the page, it would therefore fail, even though the code might be working correctly. The latter correctly waits for the element to disappear from the page. == Using the DSL in unsupported testing frameworks You can mix the DSL into any context by including +Capybara::DSL+: require 'capybara' require 'capybara/dsl' Capybara.default_driver = :culerity module MyModule include Capybara::DSL def login! within("//form[@id='session']") do fill_in 'Login', :with => 'user@example.com' fill_in 'Password', :with => 'password' end click_link 'Sign in' end end == Calling remote servers Normally Capybara expects to be testing an in-process Rack application, but you can also use it to talk to a web server running anywhere on the internets, by setting app_host: Capybara.current_driver = :selenium Capybara.app_host = 'http://www.google.com' ... visit('/') Note that the default driver (:rack_test) does not support running against a remote server. With drivers that support it, you can also visit any URL directly: visit('http://www.google.com') By default Capybara will try to boot a rack application automatically. You might want to switch off Capybara's rack server if you are running against a remote application: Capybara.run_server = false == Using the sessions manually For ultimate control, you can instantiate and use a {Session}[http://rubydoc.info/github/jnicklas/capybara/master/Capybara/Session] manually. require 'capybara' session = Capybara::Session.new(:culerity, my_rack_app) session.within("//form[@id='session']") do session.fill_in 'Login', :with => 'user@example.com' session.fill_in 'Password', :with => 'password' end session.click_link 'Sign in' == XPath, CSS and selectors Capybara does not try to guess what kind of selector you are going to give it, and will always use CSS by default. If you want to use XPath, you'll need to do: within(:xpath, '//ul/li') { ... } find(:xpath, '//ul/li').text find(:xpath, '//li[contains(.//a[@href = "#"]/text(), "foo")]').value Alternatively you can set the default selector to XPath: Capybara.default_selector = :xpath find('//ul/li').text Capybara allows you to add custom selectors, which can be very useful if you find yourself using the same kinds of selectors very often: Capybara.add_selector(:id) do xpath { |id| XPath.descendant[XPath.attr(:id) == id.to_s] } end Capybara.add_selector(:row) do xpath { |num| ".//tbody/tr[#{num}]" } end The block given to xpath must always return an XPath expression as a String, or an XPath expression generated through the XPath gem. You can now use these selectors like this: find(:id, 'post_123') find(:row, 3) You can specify an optional match option which will automatically use the selector if it matches the argument: Capybara.add_selector(:id) do xpath { |id| XPath.descendant[XPath.attr(:id) == id.to_s] } match { |value| value.is_a?(Symbol) } end Now use it like this: find(:post_123) This :id selector is already built into Capybara by default, so you don't need to add it yourself. == Beware the XPath // trap In XPath the expression // means something very specific, and it might not be what you think. Contrary to common belief, // means "anywhere in the document" not "anywhere in the current context". As an example: page.find(:xpath, '//body').all(:xpath, '//script') You might expect this to find all script tags in the body, but actually, it finds all script tags in the entire document, not only those in the body! What you're looking for is the .// expression which means "any descendant of the current node": page.find(:xpath, '//body').all(:xpath, './/script') The same thing goes for within: within(:xpath, '//body') do page.find(:xpath, './/script') within(:xpath, './/table/tbody') do ... end end == Configuring and adding drivers Capybara makes it convenient to switch between different drivers. It also exposes an API to tweak those drivers with whatever settings you want, or to add your own drivers. This is how to switch the selenium driver to use chrome: Capybara.register_driver :selenium do |app| Capybara::Selenium::Driver.new(app, :browser => :chrome) end However, it's also possible to give this a different name, so tests can switch between using different browsers effortlessly: Capybara.register_driver :selenium_chrome do |app| Capybara::Selenium::Driver.new(app, :browser => :chrome) end Whatever is returned from the block should conform to the API described by Capybara::Driver::Base, it does not however have to inherit from this class. Gems can use this API to add their own drivers to Capybara. The {Selenium wiki}[http://code.google.com/p/selenium/wiki/RubyBindings] has additional info about how the underlying driver can be configured. == Gotchas: * Access to session and request is not possible from the test, Access to response is limited. Some drivers allow access to response headers and HTTP status code, but this kind of functionality is not provided by some drivers, such as Selenium. * Access to Rails specific stuff (such as controller) is unavailable, since we're not using Rails' integration testing. * Freezing time: It's common practice to mock out the Time so that features that depend on the current Date work as expected. This can be problematic, since Capybara's Ajax timing uses the system time, resulting in Capybara never timing out and just hanging when a failure occurs. It's still possible to use plugins which allow you to travel in time, rather than freeze time. One such plugin is {Timecop}[http://github.com/jtrupiano/timecop]. * When using Rack::Test, beware if attempting to visit absolute URLs. For example, a session might not be shared between visits to posts_path and posts_url. If testing an absolute URL in an Action Mailer email, set default_url_options to match the Rails default of www.example.com. == License: (The MIT License) Copyright (c) 2009 Jonas Nicklas Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.