test.js

var expect = require('chai').expect
  , p = require('path')
  , fs = require('fs')
  , rm = require('rimraf')
  , through = require('through2')
  , chalk = require('chalk')
  , log_path = p.join(__dirname, 'logs', 'out.log')

var logger = require('./index')()

var test = function(value, expected, config) {
  config = config ? config : {}

  return function(cb) {
    var stream = through(function (chunk, enc, next) {
      chunk = new Buffer(chunk).toString()
      expect(chunk).to.equal(expected)

      cb()
    })

    config.stdout = stream

    logger = require('./index')(config)
    logger.log(value)
  }

}

describe('functionnal', function() {

  it('should throw', function(cb) {
    try {
      require('./')({stdout: 'test'})
    } catch(e) {
      expect(e instanceof TypeError).to.be.true
      cb()
    }
  })

  it('should log through stream', function(cb) {

    var stream = through(function (chunk, enc, next) {
      chunk = new Buffer(chunk).toString()
      expect(chunk).to.equal('test\n')
      cb()
    })

    logger = require('./index')({stdout: stream, noprefix: true})
    logger.log('test')

  })

  it('should log without prefix', test('test', 'test\n', {noprefix: true}) )

  it('should log without newline', test('test', 'test', {newline: false, noprefix: true}) )

  it('should log without color', test('test', 'log: test\n', {nocolors: true}) )

  it('should log with date', test('test', '[' + new Date().toLocaleString() + '] ' + chalk.grey('log') + ': test\n', {time: true}) )

  it('should log with color', test('test', chalk.grey('log') + ': test\n') )

  it('should log with custom prefix', test('test', '\\o/ test\n', {prefix: '\\o/ '}) )

  it('should log with child', test('test', '(child) test\n', {noprefix: true, child: 'child'}) )

  it('should log to file', function(cb) {
    logger = require('./index')({cwd: __dirname, noprefix: true, newline: false})
    logger.log('test')

    fs.createReadStream(log_path).on('data', function(d) {
      d = new Buffer(d).toString()

      expect(d).to.equal('test')

      cb()
    })
  })

  after(function() {
    rm.sync(p.dirname(log_path))
  })
})

describe('E2E', function() {

  it('should log', function() {
    logger = require('./index')()

    logger.log('test')
      .error('test')
      .warn('test')
      .info('test')
  })

  it('should log without prefix', function() {
    require('./')({noprefix: true}).log('test')
  })

  it('should log without newline', function() {
    require('./')({newline: false, noprefix: true}).error('test').log('test\n') //mocha issue?
  })

  it('should log without color', function() {
    require('./')({nocolors: true}).log('test').error('error')
  })

  it('should log with date', function() {
    require('./')({time: true}).log('test')
  })

  it('should format log', function() {
    require('./')().log('%s test %s', 'log', 'me')
  })

  it('should log with color', function() {
    require('./')().log('test').error('test').warn('beautiful')
  })

  it('should log with custom prefix', function() {
    require('./')({prefix: '\\o/'}).log('test')
  })

  it('should log with child', function() {
    require('./')('child').log('test')
  })

  it('should log with child and no prefix', function() {
    require('./')('child', {noprefix: true}).log('test')
  })

  it('should log with child and all time', function() {
    require('./')('child', {time: true}).info('test')
  })
})