it('range is Saturday through Sunday', (done) => {
      // Target month is December (zero-based).  12/19 is Saturday, 12/20 is Sunday
      const result = utils.findWorkdaysInRange(createStartDate(2015, 12, 19), createEndDate(2015, 12, 20), utils.createMonthRange(11, 2015));

      expect(result).to.equal(0);