s.rb

require 'test_helper'

class NoisyString
  def coerce(value, options = {})
    value.to_s.upcase
  end
end

class User
  include ShallowAttributes

  attribute :scream,  NoisyString
  attribute :screams, Array, of: NoisyString
end

class Member < User
  def coerce(value, options = {})
    raise ArgumentError
  end
end

class Organization
  include ShallowAttributes

  attribute :members, Array, of: Member, coerce: false
end

describe ShallowAttributes do
  describe 'with custom attribute encapsulating configuration' do
    let(:user) { User.new(scream: 'hello world!') }

    it 'allow custom coercion' do
      user.scream.must_equal "HELLO WORLD!"
    end

    it 'allow array of custom coercion' do
      user.screams = %w[hello world!]
      user.screams.must_equal %w[HELLO WORLD!]
    end
  end

  describe 'with disabled coercion' do
    let(:member) { Member.new(scream: 'hello world!') }
    let(:organization) { Organization.new }

    it 'allow to disable coercion' do
      organization.members = [member]
    end
  end
end