Trouble with Integration Test

I'm doing my first set of integration tests and I'm not sure what I'm doing wrong.

The code fails on the second "click_button" call on the first assert inside the call.  Debugging has shown that the controller handling the first click_button isn't using the passed params so the initial validation fails and its not redirecting to the second step.   The controller test for the individual actions work and are using identical params.

Here's my test case:

require "#{File.dirname(__FILE__)}/../test_helper"
class AccountCreationTest < ActionController::IntegrationTest
  def test_personal_account_creation
    goto_home_page
    click_link "Create Account", "/account/new_account_step_one"
    click_button "Next Step", "/account/new_account_step_one", {:user=>{:username=>"TestUser",
      :password=>'T3st!ng', :password_confirmation=>'T3st!ng', :account_type=>'Personal'}}
    click_button "Create Account", "/account/new_account_step_two", {:first_name=>'Test', :last_name=>'User'}
  end
  private
  def goto_home_page
    get "/"
    assert_response :success
    assert_template "register/list"    
  end
  def click_link(link_text, destination)
    assert_select "a[href*=#{destination}]", link_text
    get destination
    assert_response :success    
  end
  def click_button(button_text, destination, params={})
    assert_select "form[action=#{destination}]" do
      assert_select "input[type=submit][value=#{button_text}]"
    end
    post_via_redirect destination, params
  end
end