require 'spec_helper'
require 'securerandom'

describe '#render' do
  let(:app) { Class.new(Grape::API) }

  before do
    ActiveModelSerializers.config.adapter = :json
    app.format :json
    app.formatter :json, Grape::Formatter::ActiveModelSerializers
  end

  def get_resource_with(meta)
    url = "/#{SecureRandom.hex}"
    app.get(url) do
      render User.new(first_name: 'Jeff'), meta
    end
    get url
    JSON.parse last_response.body
  end

  context 'with meta key' do
    it 'includes meta key and content' do
      result = get_resource_with(meta: { total: 2 })
      expect(result).to have_key('meta')
      expect(result.fetch('meta')).to eq('total' => 2)
    end
  end

  context 'with a custom meta_key' do
    it 'includes the custom meta key name' do
      result = get_resource_with(meta: { total: 2 }, meta_key: :custom_key_name)
      expect(result).to have_key('custom_key_name')
      expect(result.fetch('custom_key_name')).to eq('total' => 2)
    end

    it 'ignores a lonely meta_key' do
      result = get_resource_with(meta_key: :custom_key_name)
      expect(result).not_to have_key('meta')
      expect(result).not_to have_key('custom_key_name')
    end
  end

  context 'junk keys' do
    it 'ignores junk keys' do
      result = get_resource_with(junk_key: { total: 2 })
      expect(result).not_to have_key('junk_key')
    end

    it 'ignores empty meta_key' do
      result = get_resource_with(meta: { total: 2 }, meta_key: nil)
      expect(result).to have_key('meta')
    end

    it 'ignores empty meta' do
      result = get_resource_with(meta: nil)
      expect(result).not_to have_key('meta')
    end
  end
end