var stream = require('../stream')
var through = require('through2')

var test = require('tape')

var expected = [
  'css-sel3',
  'background-img-opts'
]

var expectedWithIgnore = [
  'background-img-opts'
]

test('streaming works', function (t) {
  var s = stream({ browsers: 'IE >= 8' })
  s.pipe(through.obj(function (usage, enc, next) {
    t.equal(usage.feature, expected.shift())
    next()
  }, function (next) {
    next()
    t.equal(expected.length, 0)
    t.end()
  }))

  s.end('div:nth-child(2n-1) { background-size: cover; }')
})

test('streaming works with ignore option', function (t) {
  var s = stream({ browsers: 'IE >= 8', ignore: ['css-sel3'] })
  s.pipe(through.obj(function (usage, enc, next) {
    t.equal(usage.feature, expectedWithIgnore.shift())
    next()
  }, function (next) {
    next()
    t.equal(expectedWithIgnore.length, 0)
    t.end()
  }))

  s.end('div:nth-child(2n-1) { background-size: cover; }')
})

test('gracefully emit error on bad browsers list', function (t) {
  t.plan(1)
  stream({ browsers: 'Blargh!' })
  .on('error', function (e) {
    t.ok(e)
  })
})