require 'rails_helper' describe RandomTopicSelector do it 'can correctly use cache' do key = RandomTopicSelector.cache_key $redis.del key 4.times do |t| $redis.rpush key, t end expect(RandomTopicSelector.next(0)).to eq([]) expect(RandomTopicSelector.next(2)).to eq([0,1]) $redis.expects(:multi).returns(Discourse.received_readonly!) expect(RandomTopicSelector.next(2)).to eq([2,3]) $redis.unstub(:multi) expect(RandomTopicSelector.next(2)).to eq([2,3]) expect(RandomTopicSelector.next(2)).to eq([]) end it 'can correctly backfill' do category = Fabricate(:category) t1 = Fabricate(:topic, category_id: category.id) _t2 = Fabricate(:topic, category_id: category.id, visible: false) _t3 = Fabricate(:topic, category_id: category.id, deleted_at: 1.minute.ago) t4 = Fabricate(:topic, category_id: category.id) expect(RandomTopicSelector.next(5, category).sort).to eq([t1.id,t4.id].sort) end end