shared_examples_for 'stats cachable' do
  describe 'fetch_cached_stats' do
    after do
      $redis.del(described_class.stats_cache_key)
    end

    it 'returns the cached stats' do
      stats = described_class.fetch_stats.to_json
      $redis.set(described_class.stats_cache_key, stats)
      expect(described_class.fetch_cached_stats).to eq(JSON.parse(stats))
    end

    it 'returns fetches the stats if stats has not been cached' do
      freeze_time

      $redis.del(described_class.stats_cache_key)
      expect(described_class.fetch_cached_stats).to eq(JSON.parse(described_class.fetch_stats.to_json))
    end
  end

  describe 'fetch_stats' do
    it 'has not been implemented' do
      expect { described_class.fetch_stats }.to_not raise_error
    end
  end
end