Adding have_xpath matcher for Selenium

lib/webrat/selenium/matchers.rb

@@ -2,6 +2,34 @@ module Webrat
   module Selenium
     module Matchers
 
+      class HaveXpath
+        def initialize(expected)
+          @expected = expected
+        end
+
+        def matches?(response)
+          response.session.wait_for do
+            response.selenium.is_element_present("xpath=#{@expected}")
+          end
+        end
+
+        # ==== Returns
+        # String:: The failure message.
+        def failure_message
+          "expected following text to match xpath #{@expected}:\n#{@document}"
+        end
+
+        # ==== Returns
+        # String:: The failure message to be displayed in negative matches.
+        def negative_failure_message
+          "expected following text to not match xpath #{@expected}:\n#{@document}"
+        end
+      end
+
+      def have_xpath(xpath)
+        HaveXpath.new(xpath)
+      end
+
       class HaveSelector
         def initialize(expected)
           @expected = expected