Added touch to fileutils

lib/fakefs.rb

@@ -95,6 +95,10 @@ module FakeFS
     def chown_R(user, group, list, options={})
       chown(user, group, list, options={})
     end
+    
+    def touch(path)
+      FileSystem.add(path, MockFile.new)
+    end
   end
 
   class File

test/fakefs_test.rb

@@ -446,6 +446,11 @@ class FakeFSTest < Test::Unit::TestCase
     assert_equal 'works', File.open('new/nother'){|f| f.read }
   end
   
+  def test_files_can_be_touched
+    FileUtils.touch(here("file"))
+    assert File.exists?(here("file"))
+  end
+
   def here(fname)
     RealFile.expand_path(RealFile.dirname(__FILE__)+'/'+fname)
   end