it "increases for debates with more confidence" do
      more_confidence = create(:debate, :with_hot_score, created_at: now, cached_votes_total: 1000, cached_votes_up: 700)
      less_confidence = create(:debate, :with_hot_score, created_at: now, cached_votes_total: 10, cached_votes_up: 9)
      expect(more_confidence.hot_score).to be > less_confidence.hot_score