gistfile1.rb

require "rails_helper"

RSpec.describe "Lessons", type: :request do
  before { create_user }

  def json_response
    JSON.parse(response.body)
  end

  def force(*); end

  def fetch(key)
    ->(r){ r[key] }
  end

  context "GET /some/path" do
    context "when there are no lessons" do
      it "returns an empty set" do
        get api_lesson_path

        expect(json_response).to be_empty
      end
    end

    context "when there are lessons" do
      let(:lessons){ FactoryGirl.create_list(:lesson,2) }

      before{ force(lessons) }

      it "returns all lessons" do
        get api_lesson_path

        expect(json_response.map(&fetch('title'))).to match_arry(lessons.map(&fetch('title')))
      end
    end
  end

  context "GET /some/path/id" do
    context "when there exists a lesson with that id"
    context "when there exists no lesson with that id"
  end

   # etc ...
end