Fixed multiple select value for rack-test driver

lib/capybara/driver/rack_test_driver.rb

@@ -13,8 +13,12 @@ class Capybara::Driver::RackTest < Capybara::Driver::Base
       attr_name = name.to_s
       case
       when 'select' == tag_name && 'value' == attr_name
-        option = node.xpath(".//option[@selected='selected']").first || node.xpath(".//option").first
-        option.content if option
+        if node['multiple'] == 'multiple'
+          node.xpath(".//option[@selected='selected']").map { |option| option.content  }
+        else
+          option = node.xpath(".//option[@selected='selected']").first || node.xpath(".//option").first
+          option.content if option
+        end
       when 'input' == tag_name && 'checkbox' == type && 'checked' == attr_name
         node[attr_name] == 'checked' ? true : false
       else

spec/dsl/select_spec.rb

@@ -44,6 +44,16 @@ shared_examples_for "select" do
     end
 
     context "with multiple select" do
+      it "should return an empty value" do
+        @session.find_field('Language').value.should == []
+      end
+
+      it "should return value of the selected options" do
+        @session.select("Ruby",       :from => 'Language')
+        @session.select("Javascript", :from => 'Language')
+        @session.find_field('Language').value.should include('Ruby', 'Javascript')
+      end
+
       it "should select one option" do
         @session.select("Ruby", :from => 'Language')
         @session.click_button('awesome')