adding some initial functionality to properly read/write to the cache

Manifest

@@ -1,10 +1,11 @@
 CHANGELOG
+lib/render_caching/controller_additions.rb
 lib/render_caching.rb
 LICENSE
 Manifest
 README
 render-caching.gemspec
-spec/render-caching/controller_additions_spec.rb
+spec/render_caching/controller_additions_spec.rb
 spec/spec_helper.rb
 tasks/deployment.rake
 tasks/spec.rake

lib/render_caching/controller_additions.rb

@@ -1,5 +1,15 @@
 module RenderCaching
   module ControllerAdditions
+    private
 
+    def render_with_cache(key = nil)
+      key ||= request.request_uri
+      result = Rails.cache.fetch(key) { response.body }
+      render :text => Rails.cache.read(key)
+    end
   end
 end
+
+class ActionController::Base
+  include RenderCaching::ControllerAdditions
+end

spec/render_caching/controller_additions_spec.rb

@@ -1,5 +1,49 @@
 require File.dirname(__FILE__) + '/../spec_helper'
 
+# stub the Rails module functionality
+RAILS_CACHE = ActiveSupport::Cache.lookup_store(:memory_store)
+module Rails
+  def self.cache
+    RAILS_CACHE
+  end
+end
+
+describe ActionController::Base do
+  it "should have render_with_cache private method" do
+    ActionController::Base.new.private_methods.should include('render_with_cache')
+  end
+end
+
+
 describe RenderCaching::ControllerAdditions do
-  it "should add render_with_cache method to controller"
+  include RenderCaching::ControllerAdditions
+
+  before(:each) do
+    Rails.cache.clear
+    @request = stub
+    @response = stub
+    stubs(:request).returns(@request)
+    stubs(:response).returns(@response)
+    stubs(:render)
+  end
+
+  it "should read from the cache with request uri as key and render that text" do
+    @request.stubs(:request_uri).returns('/foo/bar')
+    Rails.cache.write('/foo/bar', 'page content')
+    expects(:render).with(:text => 'page content')
+    render_with_cache
+  end
+
+  it "should read from the cache with custom passed key and render that text" do
+    @request.stubs(:request_uri).returns('my_key')
+    Rails.cache.write('my_key', 'page content')
+    expects(:render).with(:text => 'page content')
+    render_with_cache 'my_key'
+  end
+
+  it "should save response.body to cache as key when not specified" do
+    @response.stubs(:body).returns('content')
+    render_with_cache 'some_key'
+    Rails.cache.read('some_key').should == 'content'
+  end
 end

spec/spec_helper.rb

@@ -1,5 +1,9 @@
 require 'rubygems'
 require 'spec'
+require 'active_support'
+require 'active_record'
+require 'action_controller'
+require 'action_view'
 require File.dirname(__FILE__) + '/../lib/render_caching.rb'
 
 Spec::Runner.configure do |config|