thoughtbot--factory_bot/spec/acceptance/activesupport_instrumentation_spec.rb

require "spec_helper"

describe "using ActiveSupport::Instrumentation to track factory interaction" do
  before do
    define_model("User", email: :string)
    FactoryGirl.define do
      factory :user do
        email "john@example.com"

        factory :slow_user do
          after_build { Kernel.sleep(0.1) }
        end
      end

    end
  end

  it "tracks proper time of creating the record" do
    time_to_execute = 0
    callback = ->(name, start, finish, id, payload) { time_to_execute = finish - start }
    ActiveSupport::Notifications.subscribed(callback, "factory_girl.run_factory") do
      FactoryGirl.build(:slow_user)
    end

    time_to_execute.should be_within(0.03).of(0.1)
  end

  it "builds the correct payload" do
    tracked_invocations = {}

    callback = ->(name, start, finish, id, payload) do
      factory_name = payload[:name]
      strategy_name = payload[:strategy]
      tracked_invocations[factory_name] ||= {}
      tracked_invocations[factory_name][strategy_name] ||= 0
      tracked_invocations[factory_name][strategy_name] += 1
    end

    ActiveSupport::Notifications.subscribed(callback, "factory_girl.run_factory") do
      FactoryGirl.build_list(:slow_user, 2)
      FactoryGirl.build_list(:user, 5)
      FactoryGirl.create_list(:user, 2)
      FactoryGirl.attributes_for(:slow_user)
    end

    tracked_invocations[:slow_user].should == { build: 2, attributes_for: 1 }
    tracked_invocations[:user].should == { build: 5, create: 2 }
  end
end