require 'rails_helper' require_dependency 'distributed_memoizer' describe DistributedMemoizer do before do $redis.del(DistributedMemoizer.redis_key("hello")) $redis.del(DistributedMemoizer.redis_lock_key("hello")) $redis.unwatch end # NOTE we could use a mock redis here, but I think it makes sense to test the real thing # let(:mock_redis) { MockRedis.new } def memoize(&block) DistributedMemoizer.memoize("hello", duration = 120, &block) end it "returns the value of a block" do expect(memoize do "abc" end).to eq("abc") end it "return the old value once memoized" do memoize do "abc" end expect(memoize do "world" end).to eq("abc") end it "memoizes correctly when used concurrently" do results = [] threads = [] 5.times do threads << Thread.new do results << memoize do sleep 0.001 SecureRandom.hex end end end threads.each(&:join) expect(results.uniq.length).to eq(1) expect(results.count).to eq(5) end end