RESTful authentication plugin test failure in Rails 2.0 Preview Release

The following tests are failing:

test_should_fail_cookie_login
test_should_login_with_cookie
test_should_fail_login_and_not_redirect
test_should_fail_expired_cookie_login

Error message:

test_should_fail_cookie_login(SessionsControllerTest):
ActionView::TemplateError: session_url failed to generate from
{:action=>"show", :controller=>"sessions"} - you may have ambiguous
routes, or you may need to supply additional parameters for this
route. content_url has the following required parameters:
["sessions", :id] - are they all satisfied?
    On line #1 of app/views/sessions/new.html.erb

    1: <% form_tag session_path do -%>
    2: <p><label for="login">Login</label><br/>
    3: <%= text_field_tag 'login' %></p>

Did anyone resolve this issue? TIA.