Add a failing test for rendering dotfiles

The test uses a simple ".htaccess" file that needs to be rendered
as any other page, like the sitemap.xml, …

test/source/.htaccess

@@ -0,0 +1,8 @@
+---
+layout: nil
+---
+ErrorDocument 404 /404.html
+ErrorDocument 500 /500.html
+{% for post in site.posts %}
+  # {{ post.url }}
+{% endfor %}

test/test_page.rb

@@ -92,6 +92,15 @@ class TestPage < Test::Unit::TestCase
         assert File.directory?(dest_dir)
         assert File.exists?(File.join(dest_dir,'sitemap.xml'))
       end
+      
+      should "write dotfiles properly" do
+        page = setup_page('.htaccess')
+        do_render(page)
+        page.write(dest_dir)
+
+        assert File.directory?(dest_dir)
+        assert File.exists?(File.join(dest_dir, '.htaccess'))
+      end
     end
 
   end