old_contents: import datetime
  
  from vacalc.employeestore import Employee
  
  def amount_of_vacation_should_be(startdate, vacation_year, exp_vacation_days):
      try:
          sdate = datetime.date(*(int(item) for item in startdate.split('-')))
      except Exception, err:
          raise AssertionError('Invalid time format %s' % err)
      actual_days = Employee('Test Employee', sdate).count_vacation(int(vacation_year))
      if  actual_days != int(exp_vacation_days):
          raise AssertionError('%s != %s' % (exp_vacation_days, actual_days))
  
new_contents: import datetime
  
  from vacalc.employeestore import Employee
  
  def calculate_vacation(startdate, vacation_year, exp_vacation_days):
      try:
          sdate = datetime.date(*(int(item) for item in startdate.split('-')))
      except Exception, err:
          raise AssertionError('Invalid time format %s' % err)
      actual_days = Employee('Test Employee', sdate).count_vacation(int(vacation_year))
      if  actual_days != int(exp_vacation_days):
          raise AssertionError('%s != %s' % (exp_vacation_days, actual_days))
  
subject: rename keyword