Extracted storage of files functionality from controller to an object called FileYard.

There is one file yard per web.

test/unit/file_yard_test.rb

@@ -0,0 +1,35 @@
+#!/bin/env ruby -w
+
+require File.dirname(__FILE__) + '/../test_helper'
+require 'fileutils'
+require 'file_yard'
+require 'stringio'
+
+class FileYardTest < Test::Unit::TestCase
+
+  def setup
+    FileUtils.mkdir_p(file_path)
+    FileUtils.rm(Dir["#{file_path}/*"])
+    @yard = FileYard.new(file_path)
+  end
+
+  def test_files
+    assert_equal [], @yard.files
+    
+    # FileYard gets the list of files from directory in the constructor
+    @yard.upload_file('aaa', StringIO.new('file contents'))
+    assert_equal ["#{file_path}/aaa"], Dir["#{file_path}/*"]
+    assert_equal ['aaa'], @yard.files
+    assert @yard.has_file?('aaa')
+    assert_equal 'file contents', File.read(@yard.file_path('aaa'))
+  end
+
+  def test_file_path
+    assert_equal "#{file_path}/abcd", @yard.file_path('abcd')
+  end
+
+  def file_path
+    "#{RAILS_ROOT}/storage/test/instiki"
+  end
+
+end