human
Solve the following python programming problem given the following code:
@ mock.patch ('ec2api.api.vpn_connection._reset_vpn_connections', wraps = vpn_connection_api._reset_vpn_connections) 
@ mock.patch ('ec2api.api.vpn_gateway._create_subnet_vpnservice', wraps = vpn_gateway_api._create_subnet_vpnservice) 
def test_attach_vpn_gateway(self, create_vpnservice, reset_vpn_connections) : 
    create_vpnservice_calls = [] 
    create_vpnservice.side_effect = tools.deepcopy_call_args_saver (create_vpnservice_calls) 
    mock_manager = mock.Mock () 
    mock_manager.attach_mock (create_vpnservice, 'create_vpnservice') 
    mock_manager.attach_mock (reset_vpn_connections, 'reset_vpn_connections') 
    self.configure (external_network = fakes.NAME_OS_PUBLIC_NETWORK) 
    subnet_2 = tools.patch_dict (fakes.DB_SUBNET_2, { 
        'vpc_id' : fakes.ID_EC2_VPC_2, 
}, ('os_vpnservice_id',)) 
    self.set_mock_db_items (fakes.DB_VPN_GATEWAY_1, fakes.DB_VPN_GATEWAY_2, fakes.DB_VPC_2, fakes.DB_IGW_1, fakes.DB_IGW_2, fakes.DB_SUBNET_1, subnet_2) 
    subnet_2_updated = tools.update_dict (subnet_2, { 
        'os_vpnservice_id' : fakes.ID_OS_VPNSERVICE_2, 
}) 
    os_vpnservice_2 = tools.patch_dict (fakes.OS_VPNSERVICE_2, { 
        'router_id' : fakes.ID_OS_ROUTER_2, 
}, ('id',)) 
    self.neutron.list_networks.return_value = { 
        'networks' : [{ 
            'id' : fakes.ID_OS_PUBLIC_NETWORK, 
}], 
} 
    self.neutron.create_vpnservice.side_effect = tools.get_neutron_create ('vpnservice', fakes.ID_OS_VPNSERVICE_2) 
    def do_check() : 
        resp = self.execute ('AttachVpnGateway', { 
            'VpcId' : fakes.ID_EC2_VPC_2, 
            'VpnGatewayId' : fakes.ID_EC2_VPN_GATEWAY_2, 
}) 
        self.assertEqual ({ 
            'attachment' : { 
                'state' : 'attached', 
                'vpcId' : fakes.ID_EC2_VPC_2, 
}, 
}, resp) 
        self.assertEqual (2, self.db_api.update_item.call_count) 
        self.db_api.update_item.assert_has_calls ([mock.call (mock.ANY, self.DB_VPN_GATEWAY_2_ATTACHED), mock.call (mock.ANY, subnet_2_updated)]) 
       ...

    
    

    Fix the buggy line: self.assertFalse (os_vpnservice_2.neutron.add_gateway_router.called)
assistant
#Here is Python program to fix the buggy line: self.

self.assertFalse (self.neutron.add_gateway_router.called)