Fix a broken test

app/models/wiki.rb

@@ -41,7 +41,7 @@ class Wiki
   def move_files(old_path, new_path)
     return if new_path == old_path
     default_path = Rails.root.join("webs", "files")
-    FileUtils.rmdir(new_path)
+    FileUtils.rmdir(new_path) if File.exist?(new_path)
     if [old_path, new_path].include? default_path
       File.rename(old_path, new_path)
       FileUtils.rmdir(old_path.parent) unless old_path == default_path

test/functional/admin_controller_test.rb

@@ -140,6 +140,7 @@ class AdminControllerTest < ActionController::TestCase
     assert @web.allow_uploads?
     assert_equal 300, @web.max_upload_size
     assert File.directory? Rails.root.join("webs", "renamed_wiki1", "files")
+    assert !File.exist?(Rails.root.join("webs", "renamed_wiki1", "wiki1"))
     assert !File.exist?(Rails.root.join("webs", "wiki1"))
   end
 
@@ -157,6 +158,7 @@ class AdminControllerTest < ActionController::TestCase
     assert_response :success
     assert @response.has_template_object?('error')
     assert File.directory? Rails.root.join("webs", "wiki1", "files")
+    assert !File.exist?(Rails.root.join("webs", "renamed_wiki1", "wiki1"))
     assert !File.exist?(Rails.root.join("webs", "renamed_wiki1"))
   end
 
@@ -179,6 +181,7 @@ class AdminControllerTest < ActionController::TestCase
     assert !@web.count_pages?
     assert !@web.allow_uploads?
     assert File.directory? Rails.root.join("webs", "renamed_wiki1", "files")
+    assert !File.exist?(Rails.root.join("webs", "renamed_wiki1", "wiki1"))
     assert !File.exist?(Rails.root.join("webs", "wiki1"))
   end