Webrat with Rails3

Hi everybody!

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

I’m using shoulda 2.11.3 and webrat 0.7.3 for the testing. I’ve read,
that webrat and shoulda are compatible with Rails3.

Anyone an idea how to fix this?