Triggering an autocomplete select box with Capybara and Turnip

form_helper.rb

# on spec/helpers
module FormHelper
  def fill_in_autocomplete(selector, value)
    page.execute_script %Q{$('#{selector}').focus().val('#{value}').keydown()}
  end

  def choose_autocomplete(text)
    find('ul.ui-autocomplete').should have_content(text)
    page.execute_script("$('.ui-menu-item:contains(\"#{text}\")').find('a').trigger('mouseenter').click()")
  end
end

# on spec_helper.rb, inside Rspec.configure block
config.include FormHelper, :type => :feature

#Calling these:
fill_in_autocomplete '#produto_search', @product.model_name
sleep 1
choose_autocomplete(@product.model_name)

Doesn't work for me, it doesn't trigger the AJAX call that collects the results unless I physically click on the input field. Cannot find a solution to this problem.