old_contents: const fs = require('fs');
  const test = require('tap').test;
  const base64url = require('..');
  const testString = fs.readFileSync(__dirname + '/test.jpg').toString();
  
  function base64(s) {
    return Buffer(s).toString('base64')
  }
  
  test('from string to base64url', function (t) {
    const b64 = base64(testString);
    const b64url = base64url(testString);
    t.same(b64url.indexOf('+'), -1, 'should not contain plus signs');
    t.same(b64url.indexOf('/'), -1, 'should not contain slashes');
    t.same(b64url.indexOf('='), -1, 'should not contain equal signs');
    t.same(b64.indexOf('+'), b64url.indexOf('-'), 'should replace + with -');
    t.same(b64.indexOf('/'), b64url.indexOf('_'), 'should replace / with _');
    t.end();
  });
  
  test('from base64url to base64', function (t) {
    const b64 = base64(testString);
    const b64url = base64url(testString);
    const result = base64url.toBase64(b64url);
    t.same(result, b64, 'should be able to convert back');
    t.end();
  });
  
  test('from base64 to base64url', function (t) {
    const b64 = base64(testString);
    const b64url = base64url(testString);
    const result = base64url.fromBase64(b64);
    t.same(result, b64url, 'should be able to convert to b64url from b64');
    t.end();
  });
  
  test('from base64url to string', function (t) {
    const b64url = base64url(testString);
    const result = base64url.decode(b64url);
    t.same(result, testString, 'should be able to decode');
    t.end();
  });
  
  test('from base64url to string', function (t) {
    const b64url = base64url(testString);
    const result = base64url.decode(Buffer(b64url));
    t.same(result, testString, 'should be able to decode');
    t.end();
  });
  
  test('from base64url to buffer', function (t) {
    const b64url = base64url(testString);
    const result = base64url.toBuffer(b64url);
    t.same(result, Buffer(testString), 'should be able to convert to buffer');
    t.end();
  });
  
new_contents: const fs = require('fs');
  const test = require('tap').test;
  const base64url = require('..');
  const testString = fs.readFileSync(__dirname + '/test.jpg').toString();
  
  function base64(s) {
    return Buffer(s).toString('base64');
  }
  
  test('from string to base64url', function (t) {
    const b64 = base64(testString);
    const b64url = base64url(testString);
    t.same(b64url.indexOf('+'), -1, 'should not contain plus signs');
    t.same(b64url.indexOf('/'), -1, 'should not contain slashes');
    t.same(b64url.indexOf('='), -1, 'should not contain equal signs');
    t.same(b64.indexOf('+'), b64url.indexOf('-'), 'should replace + with -');
    t.same(b64.indexOf('/'), b64url.indexOf('_'), 'should replace / with _');
    t.end();
  });
  
  test('from base64url to base64', function (t) {
    const b64 = base64(testString);
    const b64url = base64url(testString);
    const result = base64url.toBase64(b64url);
    t.same(result, b64, 'should be able to convert back');
    t.end();
  });
  
  test('from base64 to base64url', function (t) {
    const b64 = base64(testString);
    const b64url = base64url(testString);
    const result = base64url.fromBase64(b64);
    t.same(result, b64url, 'should be able to convert to b64url from b64');
    t.end();
  });
  
  test('from base64url to string', function (t) {
    const b64url = base64url(testString);
    const result = base64url.decode(b64url);
    t.same(Buffer(result), Buffer(testString), 'should be able to decode');
    t.end();
  });
  
  test('from base64url to string (buffer)', function (t) {
    const b64url = base64url(testString);
    const result = base64url.decode(Buffer(b64url));
    t.same(Buffer(result), Buffer(testString), 'should be able to decode');
    t.end();
  });
  
  test('from base64url to buffer', function (t) {
    const b64url = base64url(testString);
    const result = base64url.toBuffer(b64url);
    t.same(result, Buffer(testString), 'should be able to convert to buffer');
    t.end();
  });
  
subject: Fix some faily tests.