pixelnode/node_modules/lru-cache/test/serialize.js

var test = require('tap').test
var LRU = require('../')

test('dump', function (t) {
  var cache = new LRU()

  t.equal(cache.dump().length, 0, "nothing in dump for empty cache")

  cache.set("a", "A")
  cache.set("b", "B")
  t.deepEqual(cache.dump(), [
    { k: "b", v: "B", e: 0 },
    { k: "a", v: "A", e: 0 }
  ])

  cache.set("a", "A");
  t.deepEqual(cache.dump(), [
    { k: "a", v: "A", e: 0 },
    { k: "b", v: "B", e: 0 }
  ])

  cache.get("b");
  t.deepEqual(cache.dump(), [
    { k: "b", v: "B", e: 0 },
    { k: "a", v: "A", e: 0 }
  ])

  cache.del("a");
  t.deepEqual(cache.dump(), [
    { k: "b", v: "B",  e: 0 }
  ])

  t.end()
})

test("do not dump stale items", function(t) {
  var cache = new LRU({
    max: 5,
    maxAge: 50
  })

  //expires at 50
  cache.set("a", "A")

  setTimeout(function () {
    //expires at 75
    cache.set("b", "B")
    var s = cache.dump()
    t.equal(s.length, 2)
    t.equal(s[0].k, "b")
    t.equal(s[1].k, "a")
  }, 25)

  setTimeout(function () {
    //expires at 110
    cache.set("c", "C")
    var s = cache.dump()
    t.equal(s.length, 2)
    t.equal(s[0].k, "c")
    t.equal(s[1].k, "b")
  }, 60)

  setTimeout(function () {
    //expires at 130
    cache.set("d", "D", 40)
    var s = cache.dump()
    t.equal(s.length, 2)
    t.equal(s[0].k, "d")
    t.equal(s[1].k, "c")
  }, 90)

  setTimeout(function () {
    var s = cache.dump()
    t.equal(s.length, 1)
    t.equal(s[0].k, "d")
  }, 120)

  setTimeout(function () {
    var s = cache.dump()
    t.deepEqual(s, [])
    t.end()
  }, 155)
})

test("load basic cache", function(t) {
  var cache = new LRU(),
      copy = new LRU()

  cache.set("a", "A")
  cache.set("b", "B")

  copy.load(cache.dump())
  t.deepEquals(cache.dump(), copy.dump())

  t.end()
})


test("load staled cache", function(t) {
  var cache = new LRU({maxAge: 50}),
      copy = new LRU({maxAge: 50}),
      arr

  //expires at 50
  cache.set("a", "A")
  setTimeout(function () {
    //expires at 80
    cache.set("b", "B")
    arr = cache.dump()
    t.equal(arr.length, 2)
  }, 30)

  setTimeout(function () {
    copy.load(arr)
    t.equal(copy.get("a"), undefined)
    t.equal(copy.get("b"), "B")
  }, 60)

  setTimeout(function () {
    t.equal(copy.get("b"), undefined)
    t.end()
  }, 90)
})

test("load to other size cache", function(t) {
  var cache = new LRU({max: 2}),
      copy = new LRU({max: 1})

  cache.set("a", "A")
  cache.set("b", "B")

  copy.load(cache.dump())
  t.equal(copy.get("a"), undefined)
  t.equal(copy.get("b"), "B")

  //update the last read from original cache
  cache.get("a")
  copy.load(cache.dump())
  t.equal(copy.get("a"), "A")
  t.equal(copy.get("b"), undefined)

  t.end()
})


test("load to other age cache", function(t) {
  var cache = new LRU({maxAge: 50}),
      aged = new LRU({maxAge: 100}),
      simple = new LRU(),
      arr,
      expired

  //created at 0
  //a would be valid till 0 + 50
  cache.set("a", "A")
  setTimeout(function () {
    //created at 20
    //b would be valid till 20 + 50
    cache.set("b", "B")
    //b would be valid till 20 + 70
    cache.set("c", "C", 70)
    arr = cache.dump()
    t.equal(arr.length, 3)
  }, 20)

  setTimeout(function () {
    t.equal(cache.get("a"), undefined)
    t.equal(cache.get("b"), "B")
    t.equal(cache.get("c"), "C")

    aged.load(arr)
    t.equal(aged.get("a"), undefined)
    t.equal(aged.get("b"), "B")
    t.equal(aged.get("c"), "C")

    simple.load(arr)
    t.equal(simple.get("a"), undefined)
    t.equal(simple.get("b"), "B")
    t.equal(simple.get("c"), "C")
  }, 60)

  setTimeout(function () {
    t.equal(cache.get("a"), undefined)
    t.equal(cache.get("b"), undefined)
    t.equal(cache.get("c"), "C")

    aged.load(arr)
    t.equal(aged.get("a"), undefined)
    t.equal(aged.get("b"), undefined)
    t.equal(aged.get("c"), "C")

    simple.load(arr)
    t.equal(simple.get("a"), undefined)
    t.equal(simple.get("b"), undefined)
    t.equal(simple.get("c"), "C")
  }, 80)

  setTimeout(function () {
    t.equal(cache.get("a"), undefined)
    t.equal(cache.get("b"), undefined)
    t.equal(cache.get("c"), undefined)

    aged.load(arr)
    t.equal(aged.get("a"), undefined)
    t.equal(aged.get("b"), undefined)
    t.equal(aged.get("c"), undefined)

    simple.load(arr)
    t.equal(simple.get("a"), undefined)
    t.equal(simple.get("b"), undefined)
    t.equal(simple.get("c"), undefined)
    t.end()
  }, 100)

})