var test = require('tape')
  var through = require('../')
  
  // must emit end before close.
  
  test('buffering', function(assert) {
    var ts = through(function (data) {
      this.queue(data)
    }, function () {
      this.queue(null)
    })
  
    var ended = false,  actual = []
  
    ts.on('data', actual.push.bind(actual))
    ts.on('end', function () {
      ended = true
    })
  
    ts.write(1)
    ts.write(2)
    ts.write(3)
    assert.deepEqual(actual, [1, 2, 3])
    ts.pause()
    ts.write(4)
    ts.write(5)
    ts.write(6)
    assert.deepEqual(actual, [1, 2, 3])
    ts.resume()
    assert.deepEqual(actual, [1, 2, 3, 4, 5, 6])
    ts.pause()
    ts.end()
    assert.ok(!ended)
    ts.resume()
    assert.ok(ended)
    assert.end()
  })
  
  test('buffering has data in queue, when ends', function (assert) {
  
    /*
     * If stream ends while paused with data in the queue,
     * stream should still emit end after all data is written
     * on resume.
     */
  
    var ts = through(function (data) {
      this.queue(data)
    }, function () {
      this.queue(null)
    })
  
    var ended = false,  actual = []
  
    ts.on('data', actual.push.bind(actual))
    ts.on('end', function () {
      ended = true
    })
  
    ts.pause()
    ts.write(1)
    ts.write(2)
    ts.write(3)
    ts.end()
    assert.deepEqual(actual, [], 'no data written yet, still paused')
    assert.ok(!ended, 'end not emitted yet, still paused')
    ts.resume()
    assert.deepEqual(actual, [1, 2, 3], 'resumed, all data should be delivered')
    assert.ok(ended, 'end should be emitted once all data was delivered')
    assert.end();
  })