it('range is 15 days / 11 working days', (done) => {
      // Target month is December (zero-based).  12/1 and 12/15 are Tuesdays
      const result = utils.findWorkdaysInRange(createStartDate(2015, 12, 1), createEndDate(2015, 12, 15), utils.createMonthRange(11, 2015));

      expect(result).to.equal(11);