Template for a Model spec

model_spec.rb

require 'spec_helper'

describe Person do

  # NOTE: build, create and attributes_for are FactoryGirl methods
  #   You should include this line in spec_helper to make them available
  # without FactoryGirl. (prefix):
  # ---
  #   Rspec.configure do |config|
  #     ...
  # =>  config.include FactoryGirl::Syntax::Methods
  #     ...
  #   end
  # ---

  let(:person) { build(:person) }

  context 'factories' do
    it 'valid' do
      expect(build(:person)).to be_valid
    end
  end

  context 'callbacks' do
    it 'age is updated after save' do
      birth_date = Date.new(1987, 6, 25)
      person.birth_date = birth_date
      person.save!

      # calculating age correctly
      now = Date.today
      age = now.year - 1987
      unless now.month > birth_date.month ||
             (now.month == birth_date.month && now.day >= birth_date.day)
        age -= 1
      end

      expect(person.age).to eq(age)
    end
  end

  context 'associations' do
    context 'belongs to' do
      it 'city' do
        expect(person.city).to be_a_kind_of(City)
      end
    end
    # Exercise: has_many associations
  end


  context 'attributes' do
    # Rails < 4 only
    context 'accessible' do
      it 'name' do
        expect(Person.accessible_attributes).to include(:name)
      end
    end

    # same thing, with implicit spec
    context 'accessible' do
      subject { Person.accessible_attributes }
      it { should include(:name) }
    end

    context 'nested' do
      # belongs_to or has_one example
      it 'address' do
        # making sure it's empty
        person.address = nil
        attrs = attributes_for(:address)
        expect do
          person.update_attributes(address_attributes: attrs)
        end.to change(Address, :count).by(1)
      end

      # has_many example
      context 'emails' do
        it 'valid attrs' do
          # making sure it's empty
          person.emails = []
          attrs = [attributes_for(:email)]
          expect do
            person.update_attributes(emails_attributes: attrs)
          end.to change(Email, :count).by(attrs.size)
        end
        it 'rejects if address is blank' do
          attrs = [attributes_for(:email, address: nil)]
          expect do
            person.update_attributes(emails_attributes:  attrs)
          end.not_to change(Email, :count)
        end
        it 'allows destroy' do
          email = create(:email)
          person.emails << email
          expect do
            person.update_attributes(emails_attributes: [{id: email.id, _destroy: true}]
          end.to change(Email, :count).by(-1)
        end
      end
    end
  end


  context 'validations' do
    context 'name' do
      it 'presence' do
        person.name = nil
        expect(person).to have_at_least(1).errors_on(:name)
      end

      it 'uniqueness' do
        person.save!
        dupe = person.dup
        expect(dupe).to have_at_least(1).errors_on(:name)
      end
    end

    context 'city' do
      it 'presence' do
        person.city = nil
        expect(person).to have_at_least(1).errors_on(:city)
      end
    end
  end

  context 'scopes' do
    # TODO
  end

  context 'methods' do
    # TODO
  end

end