Rails performance test setup

backend_test.rb

require 'test_helper'
require 'rails/performance_test_help'
require_relative 'support/backend_test_helper'

class BackendTest < ActionDispatch::PerformanceTest
  include BackendTestHelper

  attr_reader :eddard, :jaime

  setup do
    host! 'test.host'

    @eddard = new_session_as(:eddard)
    @jaime  = candidates(:wf1_jaime)
  end

  test 'backend' do
    eddard.visits_backend
  end

  test 'api' do
    eddard.gets_candidates
  end
end

backend_test_helper.rb

module BackendTestHelper
  def new_session_as(user)
    new_session do |sess|
      sess.log_in(user)
      yield sess if block_given?
    end
  end

  def new_session
    open_session do |sess|
      sess.extend(BackendDSL)
      yield sess if block_given?
    end
  end

  def log_in(user)
    current_user = user.is_a?(User) ? user : users(user)
    post_via_redirect '/authenticate', email: current_user.email, password: '12345678'

    assert_response :success
    assert_equal '/backend', path
  end

  module BackendDSL
    def visits_backend
      get '/backend'
    end

    def gets_candidates
      get '/backend/api/candidates', format: :json
    end
  end
end