stats_helper.rb

module StatsHelper
  def stats_path
    if params[:website_id].present?
      website_stats_path(params[:website_id])
    elsif params[:id]
      organization_stats_path(params[:id])
    else
      all_stats_path
    end
  end
end

stats_helper_spec.rb

require 'rails_helper'
require 'faker'

describe StatsHelper do
  describe '#stats_path' do
    let(:organization_id) { FactoryBot.create(:organization).id }
    let!(:params) { {id: organization_id} }

    it 'return organization stats path with id of organization' do
      allow(helper).to receive(:params).and_return(params)

      expect(helper.stats_path).to eql("/organizations/#{organization_id}/stats")
    end
  end
end