This is a helper simulating mouse events related to hovering over an element: onmouseenter onmouseleave etc.

feature_spec.rb

require 'rails_helper'

RSpec.feature 'Feature', js: true do
  include InteractionHelper

  scenario 'Scenario' do
    visit '/'

    hover_mouse(find('div#id')) do
      click_on 'Button'
    end
  end
end

interaction_helper.rb

module InteractionHelper
  def hover_mouse(element)
    page.driver.browser.action.move_to(element.native, -1, -1).perform
    page.driver.browser.action.move_to(element.native, 1, 1).perform
    element.hover

    within(element) do
      yield
    end

    page.driver.browser.action.move_to(element.native, 1, 1).perform
    page.driver.browser.action.move_to(element.native, -1, -1).perform
  end
end