require('setimmediate')
var test = require('tape')

var computed = require('../computed')
var resolve = require('../resolve')
var Value = require('../value')

test('computed get accessor', function(t) {
  var value = Value(1)
  var obs = computed(value, x => x * 100)
  t.equal(resolve(obs), 100)
  value.set(2)
  t.equal(resolve(obs), 200)
  t.end()
})

test('computed lazy watch', function(t) {
  var value = Value(1)
  var obs = computed(value, x => x * 100)
  t.equal(resolve(obs), 100)

  var observedValues = []
  obs(x => observedValues.push(x))
  value.set(2)
  t.deepEqual(observedValues, [200])

  t.end()
})

test('computed lazy watch with `get` race condition', function(t) {
  var value = Value(1)
  var final = Value()

  var obs = computed(value, x => x * 100)
  t.equal(resolve(obs), 100)

  value(x => {
    resolve(obs) // resolve obs inside of observer
  })

  obs(final.set)

  value.set(2)

  t.deepEqual(resolve(final), 200)
  t.end()
})