choosealicense.com/spec/license_rules_spec.rb

require 'spec_helper'

describe "license rules" do
  licenses.each do |license|

    groups = rules.keys

    context "The #{license["title"]} license" do
      groups.each do |group|

        valid_tags = rules[group].map { |r| r["tag"] }

        context "the #{group} group" do
          it "should exist" do
            expect(license[group]).to_not be_nil
          end

          it "should only contain valid tags" do
            extra = license[group] - valid_tags
            expect(extra).to be_empty
          end
        end
      end
    end
  end
end