How to test application helper code with RSpec

module ApplicationHelper
  def title
    return t("learner") unless content_for?(:title)
  
    "#{content_for(:title)} | #{t("learner")}"
  end
end
  

require 'rails_helper'
  
RSpec.describe ApplicationHelper, type: :helper do
  
  describe '#title' do
    it 'returns page specific title in the context of the app name' do
      content_for(:title) { "Page Title" }
  
      expect(title).to eq("Page Title | #{I18n.t('learner')}")
    end
  
    it 'returns app name when page title is missing' do
      expect(title).to eq("#{I18n.t('learner')}")
    end
  end
end