node_modules/buffer/test/base64.js

var B = require('../').Buffer
var test = require('tape')

test('base64: ignore whitespace', function (t) {
  var text = '\n   YW9ldQ==  '
  var buf = new B(text, 'base64')
  t.equal(buf.toString(), 'aoeu')
  t.end()
})

test('base64: strings without padding', function (t) {
  t.equal((new B('YW9ldQ', 'base64').toString()), 'aoeu')
  t.end()
})

test('base64: newline in utf8 -- should not be an issue', function (t) {
  t.equal(
    new B('LS0tCnRpdGxlOiBUaHJlZSBkYXNoZXMgbWFya3MgdGhlIHNwb3QKdGFnczoK', 'base64').toString('utf8'),
    '---\ntitle: Three dashes marks the spot\ntags:\n'
  )
  t.end()
})

test('base64: newline in base64 -- should get stripped', function (t) {
  t.equal(
    new B('LS0tCnRpdGxlOiBUaHJlZSBkYXNoZXMgbWFya3MgdGhlIHNwb3QKdGFnczoK\nICAtIHlhbWwKICAtIGZyb250LW1hdHRlcgogIC0gZGFzaGVzCmV4cGFuZWQt', 'base64').toString('utf8'),
    '---\ntitle: Three dashes marks the spot\ntags:\n  - yaml\n  - front-matter\n  - dashes\nexpaned-'
  )
  t.end()
})

test('base64: tab characters in base64 - should get stripped', function (t) {
  t.equal(
    new B('LS0tCnRpdGxlOiBUaHJlZSBkYXNoZXMgbWFya3MgdGhlIHNwb3QKdGFnczoK\t\t\t\tICAtIHlhbWwKICAtIGZyb250LW1hdHRlcgogIC0gZGFzaGVzCmV4cGFuZWQt', 'base64').toString('utf8'),
    '---\ntitle: Three dashes marks the spot\ntags:\n  - yaml\n  - front-matter\n  - dashes\nexpaned-'
  )
  t.end()
})

test('base64: invalid non-alphanumeric characters -- should be stripped', function (t) {
  t.equal(
    new B('!"#$%&\'()*,.:;<=>?@[\\]^`{|}~', 'base64').toString('utf8'),
    ''
  )
  t.end()
})

test('base64: high byte', function (t) {
  var highByte = B.from([128])
  t.deepEqual(
    B.alloc(1, highByte.toString('base64'), 'base64'),
    highByte
  )
  t.end()
})