hunk.code_window:   })
     it('does not mutate original date', function() {
       var date = new Date('2014-09-02T11:55:00')
       startOfHour(date)
  
hunk.labels: keep keep keep replace keep
hunk.after_edit:     var date = new Date(2014, 8 /* Sep */, 2, 11, 55)
  
hunk.file_path: src/__tests__/start_of_hour_test.js
hunk.type: replace
file: var addDays = require('../add_days')
  
  describe('addDays', function() {
    it('adds number of passed days', function() {
      var result = addDays(new Date(2014, 8 /* Sep */, 1), 10)
      expect(result).to.be.eql(new Date(2014, 8 /* Sep */, 11))
    })
  
    it('accepts string', function() {
      var result = addDays(new Date(2014, 8 /* Sep */, 1).toISOString(), 10)
      expect(result).to.be.eql(new Date(2014, 8 /* Sep */, 11))
    })
  
    it('accepts timestamp', function() {
      var result = addDays(new Date(2014, 8 /* Sep */, 1).getTime(), 10)
      expect(result).to.be.eql(new Date(2014, 8 /* Sep */, 11))
    })
  
    it('does not mutate original date', function() {
      var date = new Date(2014, 8 /* Sep */, 1)
      addDays(date, 11)
      expect(date).to.be.eql(new Date(2014, 8 /* Sep */, 1))
    })
  })
  
  