diff --git a/test/helper.rb b/test/helper.rb
index e67d7d25..c7fe6264 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -10,12 +10,12 @@ include Jekyll
 class Test::Unit::TestCase
   include RR::Adapters::TestUnit
 
-  def dest_dir
-    File.join(File.dirname(__FILE__), 'dest')
+  def dest_dir(subdirs = [])
+    File.join(File.dirname(__FILE__), 'dest', *subdirs)
   end
 
-  def source_dir
-    File.join(File.dirname(__FILE__), 'source')
+  def source_dir(subdirs = [])
+    File.join(File.dirname(__FILE__), 'source', *subdirs)
   end
 
   def clear_dest
diff --git a/test/test_generated_site.rb b/test/test_generated_site.rb
index 91c5edf2..da4b26b8 100644
--- a/test/test_generated_site.rb
+++ b/test/test_generated_site.rb
@@ -10,7 +10,7 @@ class TestGeneratedSite < Test::Unit::TestCase
 
       @site = Site.new(Jekyll.configuration)
       @site.process
-      @index = File.read(File.join(dest_dir, 'index.html'))
+      @index = File.read(dest_dir('index.html'))
     end
 
     should "insert site.posts into the index" do
@@ -18,21 +18,21 @@ class TestGeneratedSite < Test::Unit::TestCase
     end
 
     should "render post.content" do
-      latest_post = Dir[File.join(source_dir, '_posts/*')].last
+      latest_post = Dir[source_dir('_posts/*')].last
       post = Post.new(@site, source_dir, '', File.basename(latest_post))
       post.transform
       assert @index.include?(post.content)
     end
 
     should "hide unpublished posts" do
-      published = Dir[File.join(dest_dir, 'publish_test/2008/02/02/*.html')].map {|f| File.basename(f)}
+      published = Dir[dest_dir('publish_test/2008/02/02/*.html')].map {|f| File.basename(f)}
 
       assert_equal 1, published.size
       assert_equal "published.html", published.first
     end
 
     should "not copy _posts directory" do
-      assert !File.exist?(File.join(dest_dir, '_posts'))
+      assert !File.exist?(dest_dir('_posts'))
     end
   end
 end
diff --git a/test/test_post.rb b/test/test_post.rb
index 936ddad0..da8b465b 100644
--- a/test/test_post.rb
+++ b/test/test_post.rb
@@ -2,11 +2,11 @@ require File.dirname(__FILE__) + '/helper'
 
 class TestPost < Test::Unit::TestCase
   def setup_post(file)
-    Post.new(@site, File.join(File.dirname(__FILE__), 'source'), '', file)
+    Post.new(@site, source_dir, '', file)
   end
 
   def do_render(post)
-    layouts = {"default" => Layout.new(@site, File.join(File.dirname(__FILE__), *%w[source _layouts]), "simple.html")}
+    layouts = { "default" => Layout.new(@site, source_dir('_layouts'), "simple.html")}
     post.render(layouts, {"site" => {"posts" => []}})
   end
 
@@ -32,7 +32,7 @@ class TestPost < Test::Unit::TestCase
 
         @real_file = "2008-10-18-foo-bar.textile"
         @fake_file = "2008-10-19-foo-bar.textile"
-        @source = File.join(File.dirname(__FILE__), *%w[source _posts])
+        @source = source_dir('_posts')
       end
 
       should "keep date, title, and markup type" do