Function factorial

test/specs/api.spec.js:355–357

(n)

  it('should accept more than one requirement', () => {
    return new Promise(done => {
      function factorial(n) {
        return n < 2 ? 1 : n * factorial(n - 1);
      }

      const p = new Parallel([1, 2, 3], {
        evalPath: isNode ? undefined : 'lib/eval.js'