```ruby
# frozen_string_literal: true
require 'rails_helper'

def stylesheet_manifest_file_exists?
  manifest_path = "#{Rails.root}/public/assets/stylesheets/rev-manifest.json"
  File.read(manifest_path)
  true
rescue Errno::ENOENT
  false
end

describe 'Feature toggles', type: :feature, js: true do
  describe 'hot_loading?' do
    context 'when enabled' do
      before { allow(Features).to receive(:hot_loading?).and_return(true) }
      it 'renders the home page' do
        visit root_path
      end
    end

    context 'when disabled' do
      before { allow(Features).to receive(:hot_loading?).and_return(false) }
      it 'renders the home page' do
        # This breaks of the manifest file is absent, which is the case when
        # `gulp hot-dev` is running.
        visit root_path if stylesheet_manifest_file_exists?
      end
    end
  end
end
```

Work around poltergeist error related to hot loading
user
```ruby
# frozen_string_literal: true
require 'rails_helper'

def stylesheet_manifest_file_exists?
  manifest_path = "#{Rails.root}/public/assets/stylesheets/rev-manifest.json"
  File.read(manifest_path)
  true
rescue Errno::ENOENT
  false
end

describe 'Feature toggles', type: :feature, js: true do
  # The main point is to exercise the Ruby hot_loading code path.
  # It doesn't work flawlessly in poltergeist, but that's okay.
  # We can work around that by disabling javascript errors breaking the test.
  before do
    page.driver.browser.js_errors = false
  end
  after do
    page.driver.browser.js_errors = true
  end

  describe 'hot_loading?' do
    context 'when enabled' do
      before { allow(Features).to receive(:hot_loading?).and_return(true) }
      it 'renders the home page' do
        visit root_path
      end
    end

    context 'when disabled' do
      before { allow(Features).to receive(:hot_loading?).and_return(false) }
      it 'renders the home page' do
        # This breaks of the manifest file is absent, which is the case when
        # `gulp hot-dev` is running.
        visit root_path if stylesheet_manifest_file_exists?
      end
    end
  end
end
```
assistant