shared_examples "Join Association on ActiveRecord 3 and 4.0" do
  let(:join_dependency) { new_join_dependency Note, {} }
  let(:reflection) { Note.reflect_on_association(:notable) }
  let(:parent) { join_dependency.join_base }
  let(:join_association) { new_join_association(reflection, join_dependency, parent, Article) }

  subject {
    join_dependency.build_join_association_respecting_polymorphism(
      reflection, parent, Person
    )
  }

  it 'respects polymorphism on equality test' do
    expect(subject).to eq(
      join_dependency.build_join_association_respecting_polymorphism(
        reflection, parent, Person
      )
    )
    expect(subject).not_to eq(
      join_dependency.build_join_association_respecting_polymorphism(
        reflection, parent, Article
      )
    )
  end

  it 'leaves the orginal reflection intact for thread safety' do
    reflection.instance_variable_set(:@klass, Article)
    join_association.swapping_reflection_klass(reflection, Person) do |new_reflection|
      expect(new_reflection.options).not_to equal reflection.options
      expect(new_reflection.options).not_to have_key(:polymorphic)
      expect(new_reflection.klass).to eq(Person)
      expect(reflection.klass).to eq(Article)
    end
  end

  it 'sets the polmorphic option to true after initializing' do
    expect(join_association.options[:polymorphic]).to be_true
  end
end