1. 팩토리는 루비 오브젝트를 테스트 데이타로 사용
2. 팩토리와 픽스처를 비교
   
3. 팩토리를  추가
4. 팩토리 구문 생략 방법
5. 페이커 젬을 사용하여 실제같은 데이타를 생성
6. 액티브 레코드의 관계(Association)
7. 팩토리를 잘 못 사용한 예

aaron:
 firstname: "Aaron"
 lastname: "Sumner"
 email: "aaron@everydayrails.com"

john:
 firstname: "John"
 lastname: "Doe"
 email: "johndoe@nobody.org"

FactoryGirl.define do
  factory :contact do
    firstname "John"
    astname "Doe"
    sequence(:email) { |n| "johndoe#{n}@example.com"}    #johndoe1@example.com, johndoe2@example.com  end
end

require'spec_helper'
describe Contact do
  it "has a valid factory" do
  expect(FactoryGirl.build(:contact)).to be_valid # build(new), create(save)  # contact = Contact.new(firstname: 'Aaron', lastname: 'Sumner', email: 'tester@example.com') endend

RSpec.configuredo|config|
  # Include Factory Girl syntax to simplify calls to factories  config.include FactoryGirl::Syntax::Methods
  # other configurations omitted ...  #  build(:contact), create(:contact), attributes_for(:contact), build_stubbed(:contact)
end

it "is invalid without a firstname" do
  contact = FactoryGirl.build(:contact, firstname: nil) expect(contact).to    have(1).errors_on(:firstname)
end
it "is invalid without a lastname" do
  contact = FactoryGirl.build(:contact, lastname: nil) expect(contact).to have(1).errors_on(:lastname)
end