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Using assert2 for view testing

Hi, I don't seem to be able to use assert2 within ActionView::TestCase without a controller.

# test_helper.rb
...
require 'action_view/test_case'
require 'nokogiri'
require 'assert2'
require 'assert2/xhtml'
...

# my_tests.rb
should 'not blow' do
     erb = <<-ERB
        <% form_for :post, @post, :url => '/do' do |f| %>
          <%= f.text_field :title, :class => 'title' %>
        <% end %>
      ERB

      assert_xml render(:inline => erb) do 
         form do
            text_field
         end
      end
 end

I get

   NoMethodError: undefined method `helpers' for nil:NilClass 
       /home/vermelho/.rvm/gems/ruby-1.8.7-p302/gems/actionpack-3.0.0/lib/action_view/test_case.rb:201:in `method_missing' 
       ./test/test_dry_forms.rb:21:in `__bind_1285809186_620305' 
       /home/vermelho/.rvm/gems/ruby-1.8.7-p302/gems/shoulda-2.11.3/lib/shoulda/context.rb:382:in `call' 
       /home/vermelho/.rvm/gems/ruby-1.8.7-p302/gems/shoulda-2.11.3/lib/shoulda/context.rb:382:in `test: helper method rendering should render check_box with custom markup and display h    uman_attribute_name. ' 
       /home/vermelho/.rvm/gems/ruby-1.8.7-p302/gems/activesupport-3.0.0/lib/active_support/testing/setup_and_teardown.rb:67:in `__send__' 
       /home/vermelho/.rvm/gems/ruby-1.8.7-p302/gems/activesupport-3.0.0/lib/active_support/testing/setup_and_teardown.rb:67:in `run' 
       /home/vermelho/.rvm/gems/ruby-1.8.7-p302/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:423:in `_run_setup_callbacks' 
       /home/vermelho/.rvm/gems/ruby-1.8.7-p302/gems/activesupport-3.0.0/lib/active_support/testing/setup_and_teardown.rb:65:in `run'

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