Validate (X)HTML and CSS in Rails functional tests

With a handy plugin written by Peter Donald, you can validate (X)HTML and CSS in your Rails functional tests.The plugin requires the XmlSimple gem. Make sure to install it:

sudo gem install xml-simple

Then, in your functional tests, you can write:

test "valid markup" do
  get :index
  assert_valid_markup
end

Unfortunately, the plugin broke somewhere around Rails 2.3.x, but I figured out how to fix it pretty fast. Here’s what made it work for me.

At the top of the file vendor/plugins/assert-valid-asset/lib/assert_valid_asset.rb insert:

require 'xmlsimple'

Replace

class Test::Unit::TestCase

with

class ActionController::TestCase

and replace

def process_with_auto_validate(action, parameters = nil, session = nil, flash = nil)
  response = process_without_auto_validate(action,parameters,session,flash)

with

def process_with_auto_validate(action, parameters = nil, session = nil, flash = nil, http_method = 'GET')
  response = process_without_auto_validate(action,parameters,session,flash,http_method)

This should get you up and running.

The original error messages were:

/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/core_ext/module/aliasing.rb:33:in `alias_method': undefined method `process' for class `Test::Unit::TestCase' (NameError)
 from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/core_ext/module/aliasing.rb:33:in `alias_method_chain'
 from /Users/janbromberger/Documents/Projects/zvg/vendor/plugins/assert-valid-asset/lib/assert_valid_asset.rb:38
 from /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
 from /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
 from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:158:in `require'
 from /Users/janbromberger/Documents/Projects/zvg/vendor/plugins/assert-valid-asset/init.rb:1:in `evaluate_init_rb'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin.rb:146:in `evaluate_init_rb'
 from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin.rb:142:in `evaluate_init_rb'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin.rb:48:in `load'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin/loader.rb:38:in `load_plugins'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin/loader.rb:37:in `each'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/plugin/loader.rb:37:in `load_plugins'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:348:in `load_plugins'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:163:in `process'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:113:in `send'
 from /opt/local/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:113:in `run'
 from /Users/janbromberger/Documents/Projects/zvg/config/environment.rb:10
 from ./test_helper.rb:2:in `require'
 from ./test_helper.rb:2
 from functional/welcome_controller_test.rb:1:in `require'
 from functional/welcome_controller_test.rb:1

This is fixed by extending class ActionController::TestCase.

ArgumentError: wrong number of arguments (5 for 4)

This is fixed by appending the http_method = ‘GET’ parameter to process_with_auto_validate.

NameError: uninitialized constant ActionController::TestCase::XmlSimple

This is fixed by installing and requiring XmlSimple.

Tags: css, english, html, markup, plugin, rails, validation, xhtml

Dieser Beitrag wurde am Donnerstag, 24. Dezember 2009 um 14:08 unter der Kategorie Tech veröffentlicht. Du kannst den Kommentaren mit dem RSS 2.0 feed folgen. Du kannst einen Kommentar schreiben oder einen Trackback von Deiner eigenen Seite setzen.