gistfile1.rb

require File.dirname(__FILE__) + '/../test_helper'
require 'signup_controller'

# Re-raise errors caught by the controller.
class SignupController; def rescue_action(e) raise e end; end
#
# Adivinen pq falla el assert_not_nil current_user, cuando no debería :-)
#
class SignupControllerTest < ActionController::TestCase

  def test_user_is_created_after_start
    assert_difference "User.count" do
      post :do_start, :user => { :login => "a_new_user", :password => "passwd", :password_confirmation => "passwd",
        :email => "a_new_user@example.com", :gender_id => Gender.find_by_name("male").id.to_s }
      assert_not_nil assigns(:user)
      assert assigns(:user).errors.empty?
      assert_response :redirect
      assert_redirected_to :action => :profile
      current_user = @controller.instance_exec { current_user }
      assert_not_nil current_user
      assert_equal current_user, assigns(:user)
    end
  end
end

gistfile2.txt