axios/test/specs/helpers/btoa.spec.js

var __btoa = require('../../../lib/helpers/btoa');

describe('btoa polyfill', function () {
  it('should behave the same as native window.btoa', function () {
    // btoa doesn't exist in IE8/9
    if (isOldIE && typeof Int8Array === 'undefined') {
      return;
    }

    var data = 'Hello, world';
    expect(__btoa(data)).toEqual(window.btoa(data));
  });

  it('should throw an error if char is out of range 0xFF', function () {
    var err;
    var data = 'I ♡ Unicode!';
    
    try {
      __btoa(data);
    } catch (e) {
      err = e;
    }

    validateInvalidCharacterError(err);
  });
});