#udelam si uzivatele
def create_user(options = {})
    post :signup, :user => { :login => 'quire', :email => 'quire@example.com',
      :password => 'quire', :password_confirmation => 'quire' }.merge(options), :attachment => {:uploaded_data => ''}
  end
#anebo uzivatele s fotkou
  def create_user_with_photo(options = {})
    post :signup, :user => { :login => 'quire', :email => 'quire@example.com',
      :password => 'quire', :password_confirmation => 'quire' }.merge(options), :attachment => {:uploaded_data =>File.new("#{RAILS_ROOT}/test/fixtures/test_image.jpg")}
  end

# a tady testuju, jestli ma tenhle uzivatel fakt pridanej nejakej soubor
def test_should_save_photo_on_signup
    assert_no_difference User, :count do
      create_user_with_photo
      assert_response :success
      assert_not_nil assigns(:user).attachment
    end
  end

#controller
@user.attachment = Attachment.new(params[:attachment]) if params[:attachment][:uploaded_data].is_a?(File)
    @user.save!