text: var test = require('tape')
  var b64 = require('../index')
  var checks = [
    'a',
    'aa',
    'aaa',
    'hi',
    'hi!',
    'hi!!',
    'sup',
    'sup?',
    'sup?!'
  ]
  
  test('convert to base64 and back', function (t) {
    t.plan(checks.length * 2)
  
    for (var i = 0; i < checks.length; i++) {
      var check = checks[i]
      var b64Str, arr, str
  
      b64Str = b64.fromByteArray(map(check, function (char) { return char.charCodeAt(0) }))
  
      arr = b64.toByteArray(b64Str)
      str = map(arr, function (byte) { return String.fromCharCode(byte) }).join('')
  
      t.equal(check, str, 'Checked ' + check)
      t.equal(b64.byteLength(b64Str), arr.length, 'Checked length for ' + check)
    }
  })
  
  function map (arr, callback) {
    var res = []
    var kValue, mappedValue
  
    for (var k = 0, len = arr.length; k < len; k++) {
      if ((typeof arr === 'string' && !!arr.charAt(k))) {
        kValue = arr.charAt(k)
        mappedValue = callback(kValue, k, arr)
        res[k] = mappedValue
      } else if (typeof arr !== 'string' && k in arr) {
        kValue = arr[k]
        mappedValue = callback(kValue, k, arr)
        res[k] = mappedValue
      }
    }
    return res
  }
  