Spitballing some spec_support for mixed in behaviors

spec_support.rb

# a-gem/lib/hydra_permlink/spec_support.rb
require 'rspec'
shared_examples 'a permalinked object' do |options|
  let(:model) { described_class.new }
  included_services = options.fetch(:services)
  if included_services.include?(:doi)
    it 'should permalink to a DOI'
  end

  if included_services.include?(:ark)
    it 'should permalink to an ARK'
  end
end

# my-app/spec/models/my_model_spec.rb
describe MyModel do
  it_behaves_like 'a permalinked object', services: [:doi, :ark]
end