/*
 * Copyright 2016 resin.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict'

const m = require('mochainon')
const StreamReadable = require('stream').Readable
const utils = require('../../lib/sdk/image-stream/utils')

describe('ImageStream: Utils', function () {
  describe('.extractStream()', function () {
    describe('given a stream that emits data', function () {
      beforeEach(function () {
        this.stream = new StreamReadable()

        /* eslint-disable no-underscore-dangle */
        this.stream._read = function () {
        /* eslint-enable no-underscore-dangle */
          this.push(Buffer.from('Hello', 'utf8'))
          this.push(Buffer.from(' ', 'utf8'))
          this.push(Buffer.from('World', 'utf8'))
          this.push(null)
        }
      })

      it('should yield the stream data', function () {
        return utils.extractStream(this.stream).then((data) => {
          m.chai.expect(data.toString()).to.equal('Hello World')
        })
      })
    })

    describe('given a stream that throws an error', function () {
      beforeEach(function () {
        this.stream = new StreamReadable()

        /* eslint-disable no-underscore-dangle */
        this.stream._read = function () {
        /* eslint-enable no-underscore-dangle */
          this.emit('error', new Error('stream error'))
        }
      })

      it('should be rejected with the error', function () {
        return utils.extractStream(this.stream).catch((error) => {
          m.chai.expect(error).to.be.an.instanceof(Error)
          m.chai.expect(error.message).to.equal('stream error')
        })
      })
    })
  })
})