Index: lib/rspec_on_rails.rb
===================================================================
--- lib/rspec_on_rails.rb	(revision 789)
+++ lib/rspec_on_rails.rb	(working copy)
@@ -114,6 +114,10 @@
       rendered = expected ? rendered_file(!expected.include?('/')) : rendered_file
       expected.should_equal rendered
     end
+    
+    def rjs
+      RjsResponseBody.new(self.body)
+    end
   end
 end
 
Index: lib/arts.rb
===================================================================
--- lib/arts.rb	(revision 0)
+++ lib/arts.rb	(revision 0)
@@ -0,0 +1,119 @@
+class RjsResponseBody < String
+  def should(action, *args, &block)
+    respond_to?("assert_rjs_#{action}") ?
+      send("assert_rjs_#{action}", *args) :
+      lined_response.should_include(create_generator.send(action, *args, &block))
+  end
+
+  def should_not(action, *args, &block)
+    lambda {should(action, *args, &block)}.should_raise Spec::Api::ExpectationNotMetError
+  end
+  
+  include ActionView::Helpers::PrototypeHelper
+  include ActionView::Helpers::ScriptaculousHelper
+  include ActionView::Helpers::JavaScriptHelper
+  
+  include ActionView::Helpers::UrlHelper
+  include ActionView::Helpers::TagHelper
+  
+  def assert_rjs_insert_html(*args)
+    position = args.shift
+    item_id = args.shift
+  
+    content = extract_matchable_content(args)
+  
+    unless content.blank?
+      case content
+        when Regexp
+          self.to_s.should_match Regexp.new("new Insertion\.#{position.to_s.camelize}(.*#{item_id}.*,.*#{content.source}.*);")
+        when String
+          lined_response.should_include("new Insertion.#{position.to_s.camelize}(\"#{item_id}\", #{content});")
+        else
+          raise "Invalid content type"
+      end
+    else
+      self.to_s.should_match Regexp.new("new Insertion\.#{position.to_s.camelize}(.*#{item_id}.*,.*?);")
+    end
+  end
+
+  def assert_rjs_replace_html(*args)
+    div = args.shift
+    content = extract_matchable_content(args)
+     
+    unless content.blank?
+      case content
+        when Regexp
+          self.to_s.should_match Regexp.new("Element.update(.*#{div}.*,.*#{content.source}.*);")
+        when String
+          lined_response.should_include("Element.update(\"#{div}\", #{content});")
+        else
+          raise "Invalid content type"
+      end
+    else
+      self.to_s.should_match Regexp.new("Element.update(.*#{div}.*,.*?);")
+    end
+  end
+
+  def assert_rjs_replace(*args)
+    div = args.shift
+    content = extract_matchable_content(args)
+  
+    unless content.blank?
+      case content
+        when Regexp
+          self.to_s.should_match Regexp.new("Element.replace(.*#{div}.*,.*#{content.source}.*);")
+        when String
+          lined_response.include?("Element.replace(\"#{div}\", #{content});")
+        else
+          raise "Invalid content type"
+      end
+    else
+      self.to_s.should_match Regexp.new("Element.replace(.*#{div}.*,.*?);")
+    end
+  end
+
+  # To deal with [] syntax. I hate JavaScriptProxy so.. SO very much
+  def assert_rjs_page(*args)
+    content = build_method_chain!(args)
+    self.to_s.should_match Regexp.new(Regexp.escape(content))
+  end
+
+  protected
+
+  def build_method_chain!(args)
+    content = create_generator.send(:[], args.shift) # start $('some_id')....
+  
+    while !args.empty?
+      if (method = args.shift.to_s) =~ /(.*)=$/
+        content = content.__send__(method, args.shift)
+        break
+      else
+        content = content.__send__(method)
+        content = content.__send__(:function_chain).first if args.empty?
+      end
+    end
+  
+    content
+  end
+
+  def lined_response
+    self.to_s.split("\n")
+  end
+
+  def create_generator
+    block = Proc.new { |*args| yield *args if block_given? } 
+    JavaScriptGenerator.new self, &block
+  end
+
+  def generic_error(action, args)
+    "#{action} with args [#{args.join(" ")}] does not show up in response:\n#{lined_response}"
+  end
+
+  def extract_matchable_content(args)
+    if args.size == 1 and args.first.is_a? Regexp
+      return args.first
+    else
+      return create_generator.send(:arguments_for_call, args)
+    end
+  end
+end
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