ES6 katas for Unicode - http://es6katas.org/

es6-unicode.js

// 17: unicode - in strings

describe('unicode strings', () => {

  it('are \\u prefixed', () => {
    const nuclear = `\u2622`;
    assert.equal(nuclear, '☢');
  });

  it('value is 4 bytes/digits', () => {
    const nuclear = '\u2622';
    assert.equal(`no more ${nuclear}`, 'no more ☢');
  });

  it('value is hexadecimal', () => {
    const nuclear = `\u006E\u006F more \u2622`;
    assert.equal(nuclear, 'no more ☢');
  });

  it('curly braces may surround the value', () => {
    const nuclear = `\u{0000000006E}\u{00006F} more \u2622`;
    assert.equal(nuclear, 'no more ☢');
  });

});