Integration tests with webrat and Rails3

I'm upgrading a Rails 2.3.5 app to Rails 3.0.3. But my integration tests aren't working. I'm getting this error:

NoMethodError: undefined method `content_type' for nil:NilClass

The line to blame is

assert_select "input#artist.title.unsolved", 1

My test_helper.rb for webrat looks likes this:

require "webrat"
require 'webrat/core/matchers'
include Webrat::Methods

Webrat.configure do |config|
  config.mode = :rack
end

I'm using shoulda 2.11.3 and webrat 0.7.3 for the test开发者_StackOverflowing. I've read, that webrat and shoulda are compatible with Rails3.

Anyone an idea how to fix this?

Thanks! tux

ADDITION:

It seems, that the NoMethodError appears from shoulda, not from Webrat, as mentioned in the title. Here is the trace:

NoMethodError: undefined method `content_type' for nil:NilClass
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in `method_missing'
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/actionpack-3.0.3/lib/action_dispatch/testing/assertions/selector.rb:605:in `response_from_page_or_rjs'
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/actionpack-3.0.3/lib/action_dispatch/testing/assertions/selector.rb:213:in `assert_select'
    test/integration/user_integration_test.rb:52:in `block (3 levels) in <class:UserIntegrationTest>'
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/shoulda-context-1.0.0.beta1/lib/shoulda/context/context.rb:412:in `call'
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/shoulda-context-1.0.0.beta1/lib/shoulda/context/context.rb:412:in `block in run_current_setup_blocks'
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/shoulda-context-1.0.0.beta1/lib/shoulda/context/context.rb:411:in `each'
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/shoulda-context-1.0.0.beta1/lib/shoulda/context/context.rb:411:in `run_current_setup_blocks'
    /Users/23tux/.rvm/gems/ruby-1.9.2-p136@rails3/gems/shoulda-context-1.0.0.beta1/lib/shoulda/context/context.rb:393:in `block in create_test_from_should_hash'

And here is the whole block context around the assert_select:

class SongIntegrationTest < ActionController::IntegrationTest
  context "a visitor" do
    context "solving a song" do
      setup do
        @song = Song.make
        visit song_path(@song)
      end

      should "have two guess fields" do
        assert_select "input#artist.title.unsolved", 1
        assert_select "input#title.title.unsolved", 1
      end

Maybe the assert_select isn't longer available in Rails 3 with Shoulda. Hope someone can help me! thx!

There is a fork of webrat that works with rails3 at https://github.com/joakimk/webrat. At some point it should get pulled into the main branch. rails 2.3 is still very popular at this time.