Use FactoryGirl AR instrumentation to track how much time is spent creating test data

factory_girl_ar_instrumentation.rb

# https://github.com/thoughtbot/factory_girl/blob/master/GETTING_STARTED.md#activesupport-instrumentation

RSpec.configure do |config|

  test_data_setup_time = 0
  ActiveSupport::Notifications.subscribe("factory_girl.run_factory") do |name, start, finish, id, payload|
    execution_time_in_seconds = finish - start

    test_data_setup_time += execution_time_in_seconds

    if execution_time_in_seconds >= 1
      $stderr.puts "Slow factory: #{payload[:name]} using strategy #{payload[:strategy]}"
    end
  end

  config.after(:suite) do
    puts "Time spent creating test data: #{test_data_setup_time} seconds"
  end
end