Add RSpec support in Capybara itself, closes #187

Just the basics of including Capybara and setting
up some metadata to switch between drivers.

README.rdoc

@@ -64,6 +64,52 @@ Now you can use it in your steps:
       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 <tt>@javascript</tt>:
+
+    @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 <tt>@selenium</tt>, <tt>@culerity</tt> and
+<tt>@rack_test</tt> tags set up for you.
+
+== Using Capybara with RSpec
+
+If you prefer RSpec to using Cucumber, you can use the built in RSpec support:
+
+    require 'capybara/rspec'
+    Capybara.app = MyRackApp
+
+You can now use it in your examples:
+
+    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
+
+RSpec's metadata feature can be used to switch to a different driver. Use the
+<tt>:js => true</tt> to switch to the javascript driver, or provide a
+<tt>:driver</tt> 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
+
+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.
+
 == Default and current driver
 
 You can set up a default driver for your features. For example if you'd prefer
@@ -82,25 +128,6 @@ You can do this in Before and After blocks to temporarily switch to a different
 driver. Note that switching driver creates a new session, so you may not be able
 to switch in the middle of a Scenario.
 
-== Cucumber and Tags
-
-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 <tt>@javascript</tt>:
-
-    @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 <tt>@selenium</tt>, <tt>@culerity</tt> and
-<tt>@rack_test</tt> tags set up for you.
-
 == Selenium
 
 At the moment, Capybara supports Webdriver, also called Selenium 2.0, *not*

lib/capybara/rspec.rb

@@ -0,0 +1,14 @@
+require 'capybara'
+require 'capybara/dsl'
+
+Rspec.configure do |config|
+  config.include Capybara
+  config.after do
+    Capybara.reset_sessions!
+    Capybara.use_default_driver
+  end
+  config.before do
+    Capybara.current_driver = Capybara.javascript_driver if example.metadata[:js]
+    Capybara.current_driver = example.metadata[:driver] if example.metadata[:driver]
+  end
+end

spec/rspec_spec.rb

@@ -0,0 +1,41 @@
+require 'spec_helper'
+require 'capybara/rspec'
+
+Capybara.app = TestApp
+
+describe 'capybara/rspec' do
+  it "should include Capybara in rpsec" do
+    visit('/foo')
+    page.body.should include('Another World')
+  end
+
+  context "resetting session" do
+    it "sets a cookie in one example..." do
+      visit('/set_cookie')
+      page.body.should include('Cookie set to test_cookie')
+    end
+
+    it "...then it is not availbable in the next" do
+      visit('/get_cookie')
+      page.body.should_not include('test_cookie')
+    end
+  end
+
+  context "setting the current driver" do
+    it "sets the current driver in one example..." do
+      Capybara.current_driver = :selenium
+    end
+
+    it "...then it has returned to the default in the next example" do
+      Capybara.current_driver.should == :rack_test
+    end
+  end
+
+  it "switches to the javascript driver when giving it as metadata", :js => true do
+    Capybara.current_driver.should == :selenium
+  end
+
+  it "switches to the given driver when giving it as metadata", :driver => :culerity do
+    Capybara.current_driver.should == :culerity
+  end
+end