require 'spec_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 RandomTopicSelector.next(2).should == [0,1] RandomTopicSelector.next(2).should == [2,3] 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) RandomTopicSelector.next(5, category).sort.should == [t1.id,t4.id].sort end end