it('range contains a weekend', (done) => {
      // Target month is December (zero-based).  12/10-12/15 === Thursday-Tuesday
      const result = utils.findWorkdaysInRange(createStartDate(2015, 12, 10), createEndDate(2015, 12, 15), utils.createMonthRange(11, 2015));

      expect(result).to.equal(4);