Stubbing out configuration with RR and making sure include tags get rendered

lib/jekyll/tags/include.rb

@@ -11,7 +11,7 @@ module Jekyll
         return "Include file '#{@file}' contains invalid characters or sequences"
       end
 
-      Dir.chdir(File.join('.', '_includes')) do
+      Dir.chdir(File.join('.', context.registers[:site].source, '_includes')) do
         choices = Dir['**/*'].reject { |x| File.symlink?(x) }
         if choices.include?(@file)
           source = File.read(@file)

test/helper.rb

@@ -3,10 +3,13 @@ require File.join(File.dirname(__FILE__), *%w[.. lib jekyll])
 require 'test/unit'
 require 'redgreen'
 require 'shoulda'
+require 'rr'
 
 include Jekyll
 
 class Test::Unit::TestCase
+  include RR::Adapters::TestUnit
+
   def dest_dir
     File.join(File.dirname(__FILE__), *%w[dest])
   end

test/test_post.rb

@@ -13,9 +13,8 @@ class TestPost < Test::Unit::TestCase
   context "A Post" do
     setup do
       clear_dest
-      @source = File.join(File.dirname(__FILE__), *%w[source])
-      @configuration = Jekyll.configuration 'source' => @source, 'destination' => dest_dir
-      @site = Site.new(@configuration)
+      stub(Jekyll).configuration { Jekyll::DEFAULTS }
+      @site = Site.new(Jekyll.configuration)
     end
 
     should "ensure valid posts are valid" do
@@ -126,7 +125,7 @@ class TestPost < Test::Unit::TestCase
           assert_equal "<<< <p>url: /2008/11/21/complex.html<br />\ndate: #{Time.parse("2008-11-21")}<br />\nid: /2008/11/21/complex</p> >>>", post.output
         end
 
-        should_eventually "include templates" do
+        should "include templates" do
           post = setup_post("2008-12-13-include.markdown")
           post.site.source = File.join(File.dirname(__FILE__), 'source')
           do_render(post)