Rails - Jul 2007 - TypeError while doing tests

I have a problem testing an invalid situation, the valid situation
without merging params (or merging valid ones) works fine.

Controller:
# @user is setted with a filter

  def update
    if @user.update_attributes(params[:user])
      redirect_to(user_path(@user))
    else
      render :action => :show
    end
  end

Test:

  def test_should_not_update_user
    # Set session values
    session_company :one
    login_as        :emilio
    # I choose a name that invalid (is too short)
    update_user(:name => ''s'')
    assert          !users(:emilio).errors.empty?,
users(:emilio).errors.full_messages
    assert_response :success
  end

protected
  def update_user(options = {})
    put :update, :user => { :name => ''Testing name'',
:street => ''test street'',
                               :city => ''Testing City'',
:zipcode => ''556678'',
                               :state => ''Testing State'',
:country =>
''Argentina'',
                               :password_actual => ''test'',
                               :password => ''testing'',
:password_confirmation => ''testing'' }.merge(options)
  end

Test Output:
Started
E...
Finished in 0.214897 seconds.

  1) Error:
test_should_not_update_user(UsersControllerTest):
TypeError: can''t convert nil into String

.....


Why i get an error on invalid name if the controller just render the
same page passing user errors...

Thanks in advance!

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