How to use the pyats.aetest.test function in pyats

    @aetest.test
    def verify_modification(self, uut, abstract, steps):
        # modify self.keys to modify the address_family value
        for item in self.mapping.keys:
            try:
                ret = item['address_family'].split()
                ret[-1] = self.MODIFY_RD
                item['address_family'] = ' '.join(ret)
            except Exception:
                log.warning('Cannot modify address family RD information.'
                             'Mismatch is expected')

        super().verify_modification(uut, abstract, steps)

    @aetest.test
    def remove_acl_modify(self,uut,aclname):
        uut.configure('''\
ip access-list extended {acl_n}
1022 deny tcp any eq 18000 any eq ftp-data'''.format(acl_n=aclname))
#        uut.configure('''\

    @aetest.test
    def restore_configuration(self, uut, method, abstract):
      # restore object point uut restore
      self.lib = self.uut_restore
      super().restore_configuration(uut, method, abstract)
      # restore object point peer restore
      self.lib = self.peer_restore
      super().restore_configuration(self.uut_peer, method, abstract)

        @aetest.test
        def verify_configuration(self, uut, abstract, steps):
            # modify self.keys to modify the multisite bgw interface value
            for item in self.mapping.keys:
                try:
                    ret = item['multisite_bgw_intf']
                    req = ['nve', '(?P.*)', 'multisite_bgw_if']
                    req.insert(len(req), ret)
                    self.mapping._verify_ops_dict['ops.vxlan.vxlan.Vxlan']['requirements'].append(req)
                    log.info("\n\nVerifying the following requirements: {req}".format(req=req))
                except Exception as e:
                    self.failed('Failed to verify the '
                                'added feature', from_exception=e)

            super().verify_configuration(uut, abstract, steps)

    @aetest.test
    def restore_configuration(self, uut, method, abstract, steps):
        '''Rollback the configuration

           Can be either done via TFTP or checkpoint feature (If exists for OS)

           Args:
               uut (`obj`): Device object.
               method (`str`): Save method from trigger datafile.
                                Only accpet "local" and "checkpoint"

           Returns:
               None

           Raises:
               pyATS Results
        '''

    @aetest.test
    def save_configuration(self, uut, method, abstract):
        '''Save current configuration

           Can be either done via TFTP or checkpoint feature (If exists for OS)

           Args:
               uut (`obj`): Device object.
               method (`str`): Save method from trigger datafile.
                               Only accpet "local" and "checkpoint"

            Returns:
                None

            Raises:
                pyATS Results
        '''

    @aetest.test
    def perform_issu(self, uut, abstract, steps):
        raise NotImplementedError

    @aetest.test
    def verify_configuration(self, uut, abstract, steps): 

        # replace the traceroute_info if has any
        if hasattr(self, 'traceroute_info'):
            for item_args in self.traceroute_info:
                for keys in self.mapping.keys:
                    item_args['dest_route'] = keys['next_hop']         
        super().verify_configuration(uut, abstract, steps)

    @aetest.test
    def verify_show_version (self, uut, steps, timeout):
        '''Platform Manager: Log Check for show version
           Args:
               uut (`obj`): Device object.
               steps (`step obj`): aetest step object
               timeout (`timeout obj`): Timeout Object

           Returns:
               None

           Raises:
               pyATS Results
        '''
        
        try:
            if hasattr(uut, 'workers'):

    @aetest.test
    def verify_prerequisite(self):
        raise NotImplementedError