/*
 * Copyright 2018-present Open Networking Foundation

 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

 * http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//Package core provides the utility for olt devices, flows and statistics
package core

import (
	"context"
	"encoding/hex"
	"fmt"
	"reflect"
	"strconv"
	"sync"
	"testing"
	"time"

	"github.com/opencord/voltha-openolt-adapter/pkg/mocks"

	fu "github.com/opencord/voltha-lib-go/v7/pkg/flows"
	"github.com/opencord/voltha-lib-go/v7/pkg/log"
	rsrcMgr "github.com/opencord/voltha-openolt-adapter/internal/pkg/resourcemanager"
	ofp "github.com/opencord/voltha-protos/v5/go/openflow_13"
	openoltpb2 "github.com/opencord/voltha-protos/v5/go/openolt"
	tp_pb "github.com/opencord/voltha-protos/v5/go/tech_profile"
)

var flowMgr []*OpenOltFlowMgr

func init() {
	_, _ = log.SetDefaultLogger(log.JSON, log.DebugLevel, nil)
	flowMgr = newMockFlowmgr()
}

func newMockFlowmgr() []*OpenOltFlowMgr {
	dh := newMockDeviceHandler()

	// onuGemInfoMap := make([]rsrcMgr.onuGemInfoMap, NumPonPorts)
	var i uint32

	for i = 0; i < NumPonPorts; i++ {
		packetInGemPort := make(map[rsrcMgr.PacketInInfoKey]uint32)
		packetInGemPort[rsrcMgr.PacketInInfoKey{IntfID: i, OnuID: i + 1, LogicalPort: i + 1, VlanID: uint16(i), Priority: uint8(i)}] = i + 1

		dh.flowMgr[i].packetInGemPort = packetInGemPort
		dh.flowMgr[i].techprofile = mocks.MockTechProfile{}

		interface2mcastQeueuMap := make(map[uint32]*QueueInfoBrief)
		interface2mcastQeueuMap[0] = &QueueInfoBrief{
			gemPortID:       4000,
			servicePriority: 3,
		}
		dh.flowMgr[i].grpMgr.interfaceToMcastQueueMap = interface2mcastQeueuMap
	}
	return dh.flowMgr
}

func TestOpenOltFlowMgr_CreateSchedulerQueues(t *testing.T) {
	tprofile := &tp_pb.TechProfileInstance{Name: "tp1", SubscriberIdentifier: "subscriber1",
		ProfileType: "pt1", NumGemPorts: 1, Version: 1,
		InstanceControl: &tp_pb.InstanceControl{Onu: "1", Uni: "1", MaxGemPayloadSize: "1"},
	}
	tprofile.UsScheduler = &tp_pb.SchedulerAttributes{}
	tprofile.UsScheduler.Direction = tp_pb.Direction_UPSTREAM
	tprofile.UsScheduler.QSchedPolicy = tp_pb.SchedulingPolicy_WRR

	tprofile2 := tprofile
	tprofile2.DsScheduler = &tp_pb.SchedulerAttributes{}
	tprofile2.DsScheduler.Direction = tp_pb.Direction_DOWNSTREAM
	tprofile2.DsScheduler.QSchedPolicy = tp_pb.SchedulingPolicy_WRR

	tests := []struct {
		name       string
		schedQueue schedQueue
		wantErr    bool
	}{
		// TODO: Add test cases.
		{"CreateSchedulerQueues-1", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 1, createFlowMetadata(tprofile, 1, Upstream)}, false},
		{"CreateSchedulerQueues-2", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 1, createFlowMetadata(tprofile2, 1, Downstream)}, false},
		{"CreateSchedulerQueues-13", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 1, createFlowMetadata(tprofile, 2, Upstream)}, false},
		{"CreateSchedulerQueues-14", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 1, createFlowMetadata(tprofile2, 2, Downstream)}, false},
		{"CreateSchedulerQueues-15", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 1, createFlowMetadata(tprofile, 3, Upstream)}, false},
		{"CreateSchedulerQueues-16", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 1, createFlowMetadata(tprofile2, 3, Downstream)}, false},
		{"CreateSchedulerQueues-17", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 1, createFlowMetadata(tprofile, 4, Upstream)}, false},
		{"CreateSchedulerQueues-18", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 1, createFlowMetadata(tprofile2, 4, Downstream)}, false},
		{"CreateSchedulerQueues-19", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 1, createFlowMetadata(tprofile, 5, Upstream)}, false},
		{"CreateSchedulerQueues-20", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 1, createFlowMetadata(tprofile2, 5, Downstream)}, false},

		{"CreateSchedulerQueues-1", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 1, createFlowMetadata(tprofile, 0, Upstream)}, false},
		{"CreateSchedulerQueues-2", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 1, createFlowMetadata(tprofile2, 0, Downstream)}, false},
		{"CreateSchedulerQueues-3", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 2, createFlowMetadata(tprofile, 2, Upstream)}, true},
		{"CreateSchedulerQueues-4", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 2, createFlowMetadata(tprofile2, 2, Downstream)}, true},
		{"CreateSchedulerQueues-5", schedQueue{tp_pb.Direction_UPSTREAM, 1, 2, 2, 64, 2, tprofile, 2, createFlowMetadata(tprofile, 3, Upstream)}, true},
		{"CreateSchedulerQueues-6", schedQueue{tp_pb.Direction_DOWNSTREAM, 1, 2, 2, 65, 2, tprofile2, 2, createFlowMetadata(tprofile2, 3, Downstream)}, true},

		//Negative testcases
		{"CreateSchedulerQueues-7", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 1, &ofp.FlowMetadata{}}, false},
		{"CreateSchedulerQueues-8", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 0, &ofp.FlowMetadata{}}, true},
		{"CreateSchedulerQueues-9", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 1, &ofp.FlowMetadata{}}, false},
		{"CreateSchedulerQueues-10", schedQueue{tp_pb.Direction_UPSTREAM, 0, 1, 1, 64, 1, tprofile, 2, &ofp.FlowMetadata{}}, true},
		{"CreateSchedulerQueues-11", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 2, &ofp.FlowMetadata{}}, true},
		{"CreateSchedulerQueues-12", schedQueue{tp_pb.Direction_DOWNSTREAM, 0, 1, 1, 65, 1, tprofile2, 2, nil}, true},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := flowMgr[tt.schedQueue.intfID].CreateSchedulerQueues(ctx, tt.schedQueue); (err != nil) != tt.wantErr {
				t.Errorf("OpenOltFlowMgr.CreateSchedulerQueues() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

func createFlowMetadata(techProfile *tp_pb.TechProfileInstance, tcontType int, direction string) *ofp.FlowMetadata {
	var additionalBw tp_pb.AdditionalBW
	bands := make([]*ofp.OfpMeterBandHeader, 0)
	switch tcontType {
	case 1:
		//tcont-type-1
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 10000, BurstSize: 0, Data: &ofp.OfpMeterBandHeader_Drop{}})
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 10000, BurstSize: 0, Data: &ofp.OfpMeterBandHeader_Drop{}})
		additionalBw = tp_pb.AdditionalBW_AdditionalBW_None
	case 2:
		//tcont-type-2
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 60000, BurstSize: 10000, Data: &ofp.OfpMeterBandHeader_Drop{}})
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 50000, BurstSize: 10000, Data: &ofp.OfpMeterBandHeader_Drop{}})
		additionalBw = tp_pb.AdditionalBW_AdditionalBW_None
	case 3:
		//tcont-type-3
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 100000, BurstSize: 10000, Data: &ofp.OfpMeterBandHeader_Drop{}})
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 50000, BurstSize: 20000, Data: &ofp.OfpMeterBandHeader_Drop{}})
		additionalBw = tp_pb.AdditionalBW_AdditionalBW_NA
	case 4:
		//tcont-type-4
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 200000, BurstSize: 10000, Data: &ofp.OfpMeterBandHeader_Drop{}})
		additionalBw = tp_pb.AdditionalBW_AdditionalBW_BestEffort
	case 5:
		//tcont-type-5
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 50000, BurstSize: 10000, Data: &ofp.OfpMeterBandHeader_Drop{}})
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 100000, BurstSize: 10000, Data: &ofp.OfpMeterBandHeader_Drop{}})
		bands = append(bands, &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 10000, BurstSize: 0, Data: &ofp.OfpMeterBandHeader_Drop{}})
		additionalBw = tp_pb.AdditionalBW_AdditionalBW_BestEffort
	default:
		// do nothing, we will return meter config with no meter bands
	}

	if direction == Downstream {
		techProfile.DsScheduler.AdditionalBw = additionalBw
	} else {
		techProfile.UsScheduler.AdditionalBw = additionalBw
	}

	ofpMeterConfig := &ofp.OfpMeterConfig{Flags: 1, MeterId: 1, Bands: bands}
	return &ofp.FlowMetadata{
		Meters: []*ofp.OfpMeterConfig{ofpMeterConfig}}
}

func TestOpenOltFlowMgr_RemoveSchedulerQueues(t *testing.T) {
	tprofile := &tp_pb.TechProfileInstance{Name: "tp1", SubscriberIdentifier: "subscriber1",
		ProfileType: "pt1", NumGemPorts: 1, Version: 1,
		InstanceControl: &tp_pb.InstanceControl{Onu: "1", Uni: "1", MaxGemPayloadSize: "1"},
	}
	tprofile.UsScheduler = &tp_pb.SchedulerAttributes{}
	tprofile.UsScheduler.Direction = tp_pb.Direction_UPSTREAM
	tprofile.UsScheduler.AdditionalBw = tp_pb.AdditionalBW_AdditionalBW_None
	tprofile.UsScheduler.QSchedPolicy = tp_pb.SchedulingPolicy_WRR

	tprofile2 := tprofile
	tprofile2.DsScheduler = &tp_pb.SchedulerAttributes{}
	tprofile2.DsScheduler.Direction = tp_pb.Direction_DOWNSTREAM
	tprofile2.DsScheduler.AdditionalBw = tp_pb.AdditionalBW_AdditionalBW_None
	tprofile2.DsScheduler.QSchedPolicy = tp_pb.SchedulingPolicy_WRR
	//defTprofile := &tp.DefaultTechProfile{}
	tests := []struct {
		name       string
		schedQueue schedQueue
		wantErr    bool
	}{
		// TODO: Add test cases.
		{"RemoveSchedulerQueues", schedQueue{tp_pb.Direction_UPSTREAM, 1, 1, 1, 64, 1, tprofile, 0, nil}, false},
		{"RemoveSchedulerQueues", schedQueue{tp_pb.Direction_DOWNSTREAM, 1, 1, 1, 65, 1, tprofile2, 0, nil}, false},
		// negative test cases
		{"RemoveSchedulerQueues", schedQueue{tp_pb.Direction_DOWNSTREAM, 1, 1, 1, 65, 1, tprofile2, 0, nil}, false},
		{"RemoveSchedulerQueues", schedQueue{tp_pb.Direction_DOWNSTREAM, 1, 1, 1, 65, 1, tprofile2, 0, nil}, false},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := flowMgr[tt.schedQueue.intfID].RemoveSchedulerQueues(ctx, tt.schedQueue); (err != nil) != tt.wantErr {
				t.Errorf("OpenOltFlowMgr.RemoveSchedulerQueues() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}

}

func TestOpenOltFlowMgr_createTcontGemports(t *testing.T) {
	bands := make([]*ofp.OfpMeterBandHeader, 2)
	bands[0] = &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 1000, BurstSize: 5000, Data: &ofp.OfpMeterBandHeader_Drop{}}
	bands[1] = &ofp.OfpMeterBandHeader{Type: ofp.OfpMeterBandType_OFPMBT_DROP, Rate: 2000, BurstSize: 5000, Data: &ofp.OfpMeterBandHeader_Drop{}}
	ofpMeterConfig := &ofp.OfpMeterConfig{Flags: 1, MeterId: 1, Bands: bands}
	flowmetadata := &ofp.FlowMetadata{
		Meters: []*ofp.OfpMeterConfig{ofpMeterConfig},
	}
	type args struct {
		intfID       uint32
		onuID        uint32
		uniID        uint32
		uni          string
		uniPort      uint32
		TpID         uint32
		UsMeterID    uint32
		DsMeterID    uint32
		flowMetadata *ofp.FlowMetadata
	}
	tests := []struct {
		name string
		args args
	}{
		{"createTcontGemports-1", args{intfID: 0, onuID: 1, uniID: 1, uni: "16", uniPort: 1, TpID: 64, UsMeterID: 1, DsMeterID: 1, flowMetadata: flowmetadata}},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			_, _, tpInst := flowMgr[tt.args.intfID].createTcontGemports(ctx, tt.args.intfID, tt.args.onuID, tt.args.uniID, tt.args.uni, tt.args.uniPort, tt.args.TpID, tt.args.UsMeterID, tt.args.DsMeterID, tt.args.flowMetadata)
			switch tpInst := tpInst.(type) {
			case *tp_pb.TechProfileInstance:
				if tt.args.TpID != 64 {
					t.Errorf("OpenOltFlowMgr.createTcontGemports() error = different tech, tech %v", tpInst)
				}
			case *tp_pb.EponTechProfileInstance:
				if tt.args.TpID != 65 {
					t.Errorf("OpenOltFlowMgr.createTcontGemports() error = different tech, tech %v", tpInst)
				}
			default:
				t.Errorf("OpenOltFlowMgr.createTcontGemports() error = different tech, tech %v", tpInst)
			}
		})
	}
}

func TestOpenOltFlowMgr_RemoveFlow(t *testing.T) {
	ctx := context.Background()
	logger.Debug(ctx, "Info Warning Error: Starting RemoveFlow() test")
	fa := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(2),
			fu.Metadata_ofp(2),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 101)),
			fu.Output(1),
		},
	}
	ofpstats, _ := fu.MkFlowStat(fa)
	ofpstats.Cookie = ofpstats.Id
	lldpFa := &fu.FlowArgs{
		KV: fu.OfpFlowModArgs{"priority": 1000, "cookie": 48132224281636694},
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1),
			fu.EthType(0x88CC),
			fu.TunnelId(536870912),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(uint32(ofp.OfpPortNo_OFPP_CONTROLLER)),
		},
	}
	lldpofpstats, _ := fu.MkFlowStat(lldpFa)
	//lldpofpstats.Cookie = lldpofpstats.Id

	dhcpFa := &fu.FlowArgs{
		KV: fu.OfpFlowModArgs{"priority": 1000, "cookie": 48132224281636694},
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1),
			fu.UdpSrc(67),
			//fu.TunnelId(536870912),
			fu.IpProto(17),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(uint32(ofp.OfpPortNo_OFPP_CONTROLLER)),
		},
	}
	dhcpofpstats, _ := fu.MkFlowStat(dhcpFa)
	//dhcpofpstats.Cookie = dhcpofpstats.Id

	//multicast flow
	multicastFa := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(16777216),
			fu.VlanVid(660),             //vlan
			fu.Metadata_ofp(uint64(66)), //inner vlan
			fu.EthType(0x800),           //ipv4
			fu.Ipv4Dst(3809869825),      //227.22.0.1
		},
		Actions: []*ofp.OfpAction{
			fu.Group(1),
		},
	}
	multicastOfpStats, _ := fu.MkFlowStat(multicastFa)
	multicastOfpStats.Id = 1

	pppoedFa := &fu.FlowArgs{
		KV: fu.OfpFlowModArgs{"priority": 1000, "cookie": 48132224281636694},
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1),
			fu.EthType(0x8863),
			fu.TunnelId(536870912),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(uint32(ofp.OfpPortNo_OFPP_CONTROLLER)),
		},
	}
	pppoedOfpStats, _ := fu.MkFlowStat(pppoedFa)

	type args struct {
		flow *ofp.OfpFlowStats
	}
	tests := []struct {
		name string
		args args
	}{
		// TODO: Add test cases.
		{"RemoveFlow", args{flow: ofpstats}},
		{"RemoveFlow", args{flow: lldpofpstats}},
		{"RemoveFlow", args{flow: dhcpofpstats}},
		{"RemoveFlow", args{flow: multicastOfpStats}},
		{"RemoveFlow", args{flow: pppoedOfpStats}},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := flowMgr[0].RemoveFlow(ctx, tt.args.flow); err != nil {
				logger.Warn(ctx, err)
			}
		})
	}
	// t.Error("=====")
}

func TestOpenOltFlowMgr_AddFlow(t *testing.T) {
	kw := make(map[string]uint64)
	kw["table_id"] = 1
	kw["meter_id"] = 1
	kw["write_metadata"] = 0x4000000000 // Tech-Profile-ID 64

	// Upstream flow
	fa := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(16777216),
			fu.PushVlan(0x8100),
		},
		KV: kw,
	}

	// Downstream flow
	fa3 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(16777216),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			//fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 101)),
			fu.PopVlan(),
			fu.Output(536870912),
		},
		KV: kw,
	}

	fa2 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1000),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 101)),
			fu.Output(65533),
		},
		KV: kw,
	}

	// TODO Add LLDP flow
	// TODO Add DHCP flow

	// Flows for negative scenarios
	// Failure in formulateActionInfoFromFlow()
	fa4 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1000),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			fu.Experimenter(257, []byte{1, 2, 3, 4}),
		},
		KV: kw,
	}

	// Invalid Output
	fa5 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1000),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(0),
		},
		KV: kw,
	}

	// Tech-Profile-ID update (not supported)
	kw6 := make(map[string]uint64)
	kw6["table_id"] = 1
	kw6["meter_id"] = 1
	kw6["write_metadata"] = 0x4100000000 // TpID Other than the stored one
	fa6 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.TunnelId(16),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(65535),
		},
		KV: kw6,
	}

	lldpFa := &fu.FlowArgs{
		KV: fu.OfpFlowModArgs{"priority": 1000, "cookie": 48132224281636694},
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1),
			fu.EthType(0x88CC),
			fu.TunnelId(536870912),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(uint32(ofp.OfpPortNo_OFPP_CONTROLLER)),
		},
	}

	dhcpFa := &fu.FlowArgs{
		KV: fu.OfpFlowModArgs{"priority": 1000, "cookie": 48132224281636694},
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1),
			fu.UdpSrc(67),
			//fu.TunnelId(536870912),
			fu.IpProto(17),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(uint32(ofp.OfpPortNo_OFPP_CONTROLLER)),
		},
	}
	igmpFa := &fu.FlowArgs{
		KV: fu.OfpFlowModArgs{"priority": 1000, "cookie": 48132224281636694},
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1),
			fu.UdpSrc(67),
			//fu.TunnelId(536870912),
			fu.IpProto(2),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(uint32(ofp.OfpPortNo_OFPP_CONTROLLER)),
		},
	}

	pppoedFa := &fu.FlowArgs{
		KV: fu.OfpFlowModArgs{"priority": 1000, "cookie": 48132224281636694},
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(1),
			fu.EthType(0x8863),
			fu.TunnelId(536870912),
		},
		Actions: []*ofp.OfpAction{
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(uint32(ofp.OfpPortNo_OFPP_CONTROLLER)),
		},
	}

	fa9 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.TunnelId(16),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
			fu.VlanPcp(1000),
			fu.UdpDst(16777216),
			fu.UdpSrc(536870912),
			fu.Ipv4Dst(65535),
			fu.Ipv4Src(536870912),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(65535),
		},
		KV: kw6,
	}

	fa10 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(65533),
			//	fu.TunnelId(16),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
			fu.VlanPcp(1000),
			fu.UdpDst(65535),
			fu.UdpSrc(536870912),
			fu.Ipv4Dst(65535),
			fu.Ipv4Src(536870912),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(65535),
		},
		KV: kw6,
	}
	//multicast flow
	fa11 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(16777216),
			fu.VlanVid(660),             //vlan
			fu.Metadata_ofp(uint64(66)), //inner vlan
			fu.EthType(0x800),           //ipv4
			fu.Ipv4Dst(3809869825),      //227.22.0.1
		},
		Actions: []*ofp.OfpAction{
			fu.Group(1),
		},
		KV: kw6,
	}
	ofpstats, _ := fu.MkFlowStat(fa)
	ofpstats2, _ := fu.MkFlowStat(fa2)
	ofpstats3, _ := fu.MkFlowStat(fa3)
	ofpstats4, _ := fu.MkFlowStat(fa4)
	ofpstats5, _ := fu.MkFlowStat(fa5)
	ofpstats6, _ := fu.MkFlowStat(fa6)
	ofpstats7, _ := fu.MkFlowStat(lldpFa)
	ofpstats8, _ := fu.MkFlowStat(dhcpFa)
	ofpstats9, _ := fu.MkFlowStat(fa9)
	ofpstats10, _ := fu.MkFlowStat(fa10)
	igmpstats, _ := fu.MkFlowStat(igmpFa)
	ofpstats11, _ := fu.MkFlowStat(fa11)
	pppoedstats, _ := fu.MkFlowStat(pppoedFa)

	fmt.Println(ofpstats6, ofpstats9, ofpstats10)

	ofpMeterConfig := &ofp.OfpMeterConfig{Flags: 1, MeterId: 1}
	flowMetadata := &ofp.FlowMetadata{
		Meters: []*ofp.OfpMeterConfig{ofpMeterConfig},
	}
	type args struct {
		flow         *ofp.OfpFlowStats
		flowMetadata *ofp.FlowMetadata
	}
	tests := []struct {
		name string
		args args
	}{
		// TODO: Add test cases.
		{"AddFlow", args{flow: ofpstats, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: ofpstats2, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: ofpstats3, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: ofpstats4, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: ofpstats5, flowMetadata: flowMetadata}},
		//{"AddFlow", args{flow: ofpstats6, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: ofpstats7, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: ofpstats8, flowMetadata: flowMetadata}},
		//{"AddFlow", args{flow: ofpstats9, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: igmpstats, flowMetadata: flowMetadata}},
		//{"AddFlow", args{flow: ofpstats10, flowMetadata: flowMetadata}},
		//ofpstats10
		{"AddFlow", args{flow: ofpstats11, flowMetadata: flowMetadata}},
		{"AddFlow", args{flow: pppoedstats, flowMetadata: flowMetadata}},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			_ = flowMgr[0].AddFlow(ctx, tt.args.flow, tt.args.flowMetadata)
			// TODO: actually verify test cases
		})
	}
}

func TestOpenOltFlowMgr_UpdateOnuInfo(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	wg := sync.WaitGroup{}

	intfCount := NumPonPorts
	onuCount := OnuIDEnd - OnuIDStart + 1

	for i := 0; i < intfCount; i++ {
		for j := 1; j <= onuCount; j++ {
			wg.Add(1)
			go func(i uint32, j uint32) {
				// TODO: actually verify success
				_ = flowMgr[i].AddOnuInfoToFlowMgrCacheAndKvStore(ctx, i, i, fmt.Sprintf("onu-%d", i))
				wg.Done()
			}(uint32(i), uint32(j))
		}

	}

	wg.Wait()
}

func TestOpenOltFlowMgr_addGemPortToOnuInfoMap(t *testing.T) {
	intfNum := NumPonPorts
	onuNum := OnuIDEnd - OnuIDStart + 1

	// clean the flowMgr
	for i := 0; i < intfNum; i++ {
		flowMgr[i].onuGemInfoMap = make(map[uint32]*rsrcMgr.OnuGemInfo)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	// Create OnuInfo
	for i := 0; i < intfNum; i++ {
		for o := 1; o <= onuNum; o++ {
			// TODO: actually verify success
			_ = flowMgr[i].AddOnuInfoToFlowMgrCacheAndKvStore(ctx, uint32(i), uint32(o), fmt.Sprintf("i%do%d", i, o-1))
		}
	}

	// Add gemPorts to OnuInfo in parallel threads
	wg := sync.WaitGroup{}
	for o := 1; o <= onuNum; o++ {
		for i := 0; i < intfNum; i++ {
			wg.Add(1)
			go func(intfId uint32, onuId uint32) {
				gemID, _ := strconv.Atoi(fmt.Sprintf("90%d%d", intfId, onuId-1))

				flowMgr[intfId].addGemPortToOnuInfoMap(ctx, intfId, onuId, uint32(gemID))
				wg.Done()
			}(uint32(i), uint32(o))
		}
	}

	wg.Wait()

	// check that each entry of onuGemInfoMap has the correct number of ONUs
	for i := 0; i < intfNum; i++ {
		lenofOnu := len(flowMgr[i].onuGemInfoMap)
		if onuNum != lenofOnu {
			t.Errorf("onuGemInfoMap length is not as expected len = %d, want %d", lenofOnu, onuNum)
		}

		for o := 1; o <= onuNum; o++ {
			lenOfGemPorts := len(flowMgr[i].onuGemInfoMap[uint32(o)].GemPorts)
			// check that each onuEntry has 1 gemPort
			if lenOfGemPorts != 1 {
				t.Errorf("Expected 1 GemPort per ONU, found %d", lenOfGemPorts)
			}

			// check that the value of the gemport is correct
			gemID, _ := strconv.Atoi(fmt.Sprintf("90%d%d", i, o-1))
			currentValue := flowMgr[i].onuGemInfoMap[uint32(o)].GemPorts[0]
			if uint32(gemID) != currentValue {
				t.Errorf("Expected GemPort value to be %d, found %d", gemID, currentValue)
			}
		}
	}
}

func TestOpenOltFlowMgr_deleteGemPortFromLocalCache(t *testing.T) {
	// Create fresh flowMgr instance
	flowMgr = newMockFlowmgr()
	type args struct {
		intfID                uint32
		onuID                 uint32
		gemPortIDs            []uint32
		gemPortIDsToBeDeleted []uint32
		gemPortIDsRemaining   []uint32
		serialNum             string
		finalLength           int
	}
	tests := []struct {
		name string
		args args
	}{
		// Add/Delete single gem port
		{"DeleteGemPortFromLocalCache1", args{0, 1, []uint32{1}, []uint32{1}, []uint32{}, "onu1", 0}},
		// Delete all gemports
		{"DeleteGemPortFromLocalCache2", args{0, 1, []uint32{1, 2, 3, 4}, []uint32{1, 2, 3, 4}, []uint32{}, "onu1", 0}},
		// Try to delete when there is no gem port
		{"DeleteGemPortFromLocalCache3", args{0, 1, []uint32{}, []uint32{1, 2}, nil, "onu1", 0}},
		// Try to delete non-existent gem port
		{"DeleteGemPortFromLocalCache4", args{0, 1, []uint32{1}, []uint32{2}, []uint32{1}, "onu1", 1}},
		// Try to delete two of the gem ports
		{"DeleteGemPortFromLocalCache5", args{0, 1, []uint32{1, 2, 3, 4}, []uint32{2, 4}, []uint32{1, 3}, "onu1", 2}},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := flowMgr[tt.args.intfID].RemoveOnuInfoFromFlowMgrCacheAndKvStore(ctx, tt.args.intfID, tt.args.onuID); err != nil {
				t.Errorf("failed to remove onu")
			}
			if err := flowMgr[tt.args.intfID].AddOnuInfoToFlowMgrCacheAndKvStore(ctx, tt.args.intfID, tt.args.onuID, tt.args.serialNum); err != nil {
				t.Errorf("failed to add onu")
			}
			for _, gemPort := range tt.args.gemPortIDs {
				flowMgr[tt.args.intfID].addGemPortToOnuInfoMap(ctx, tt.args.intfID, tt.args.onuID, gemPort)
			}
			for _, gemPortDeleted := range tt.args.gemPortIDsToBeDeleted {
				flowMgr[tt.args.intfID].deleteGemPortFromLocalCache(ctx, tt.args.intfID, tt.args.onuID, gemPortDeleted)
			}
			lenofGemPorts := 0
			gP, ok := flowMgr[tt.args.intfID].onuGemInfoMap[tt.args.onuID]
			if ok {
				lenofGemPorts = len(gP.GemPorts)
			}
			if lenofGemPorts != tt.args.finalLength {
				t.Errorf("GemPorts length is not as expected len = %d, want %d", lenofGemPorts, tt.args.finalLength)
			}
			gP, ok = flowMgr[tt.args.intfID].onuGemInfoMap[tt.args.onuID]
			var gemPorts []uint32
			if ok {
				gemPorts = gP.GemPorts
			}
			if !reflect.DeepEqual(tt.args.gemPortIDsRemaining, gemPorts) {
				t.Errorf("GemPorts are not as expected = %v, want %v", gemPorts, tt.args.gemPortIDsRemaining)
			}

		})
	}
}

func TestOpenOltFlowMgr_GetLogicalPortFromPacketIn(t *testing.T) {
	type args struct {
		packetIn *openoltpb2.PacketIndication
	}
	tests := []struct {
		name    string
		args    args
		want    uint32
		wantErr bool
	}{
		// TODO: Add test cases.
		{"GetLogicalPortFromPacketIn", args{packetIn: &openoltpb2.PacketIndication{IntfType: "pon", IntfId: 0, GemportId: 255, OnuId: 1, UniId: 0, FlowId: 100, PortNo: 1, Cookie: 100, Pkt: []byte("GetLogicalPortFromPacketIn")}}, 1, false},
		{"GetLogicalPortFromPacketIn", args{packetIn: &openoltpb2.PacketIndication{IntfType: "nni", IntfId: 0, GemportId: 1, OnuId: 1, UniId: 0, FlowId: 100, PortNo: 1, Cookie: 100, Pkt: []byte("GetLogicalPortFromPacketIn")}}, 16777216, false},
		// Negative Test cases.
		{"GetLogicalPortFromPacketIn", args{packetIn: &openoltpb2.PacketIndication{IntfType: "pon", IntfId: 1, GemportId: 1, OnuId: 1, UniId: 0, FlowId: 100, PortNo: 1, Cookie: 100, Pkt: []byte("GetLogicalPortFromPacketIn")}}, 1, false},
		{"GetLogicalPortFromPacketIn", args{packetIn: &openoltpb2.PacketIndication{IntfType: "pon", IntfId: 0, GemportId: 257, OnuId: 1, UniId: 0, FlowId: 100, PortNo: 0, Cookie: 100, Pkt: []byte("GetLogicalPortFromPacketIn")}}, 256, false},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {

			got, err := flowMgr[tt.args.packetIn.IntfId].GetLogicalPortFromPacketIn(ctx, tt.args.packetIn)
			if (err != nil) != tt.wantErr {
				t.Errorf("OpenOltFlowMgr.GetLogicalPortFromPacketIn() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if got != tt.want {
				t.Errorf("OpenOltFlowMgr.GetLogicalPortFromPacketIn() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestOpenOltFlowMgr_GetPacketOutGemPortID(t *testing.T) {
	// Create fresh flowMgr instance
	flowMgr = newMockFlowmgr()

	//untagged packet in hex string
	untaggedStr := "01005e000002000000000001080046c00020000040000102fa140a000001e00000029404000017000705e10000fa"
	untagged, err := hex.DecodeString(untaggedStr)
	if err != nil {
		t.Error("Unable to parse hex string", err)
		panic(err)
	}
	//single-tagged packet in hex string. vlanID.pbit: 1.1
	singleTaggedStr := "01005e0000010025ba48172481002001080046c0002000004000010257deab140023e0000001940400001164ee9b0000000000000000000000000000"
	singleTagged, err := hex.DecodeString(singleTaggedStr)
	if err != nil {
		t.Error("Unable to parse hex string", err)
		panic(err)
	}
	//double-tagged packet in hex string. vlanID.pbit: 210.0-0.0
	doubleTaggedStr := "01005e000016deadbeefba118100021081000000080046000028000000000102c5b87f000001e0000016940400002200f8030000000104000000e10000fa"
	doubleTagged, err := hex.DecodeString(doubleTaggedStr)
	if err != nil {
		t.Error("Unable to parse hex string", err)
		panic(err)
	}

	type args struct {
		intfID  uint32
		onuID   uint32
		portNum uint32
		packet  []byte
	}
	tests := []struct {
		name    string
		args    args
		want    uint32
		wantErr bool
	}{
		// TODO: Add test cases.
		{"GetPacketOutGemPortID", args{intfID: 0, onuID: 1, portNum: 1, packet: untagged}, 1, false},
		{"GetPacketOutGemPortID", args{intfID: 1, onuID: 2, portNum: 2, packet: singleTagged}, 2, false},
		{"GetPacketOutGemPortID", args{intfID: 0, onuID: 1, portNum: 1, packet: doubleTagged}, 1, false},
		{"GetPacketOutGemPortID", args{intfID: 0, onuID: 10, portNum: 10, packet: untagged}, 2, true},
		{"GetPacketOutGemPortID", args{intfID: 0, onuID: 1, portNum: 3, packet: []byte{}}, 3, true},
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {

			got, err := flowMgr[tt.args.intfID].GetPacketOutGemPortID(ctx, tt.args.intfID, tt.args.onuID, tt.args.portNum, tt.args.packet)
			if tt.wantErr {
				if err == nil {
					//error expected but got value
					t.Errorf("OpenOltFlowMgr.GetPacketOutGemPortID() = %v, wantErr %v", got, tt.wantErr)
				}
			} else {
				if err != nil {
					//error is not expected but got error
					t.Errorf("OpenOltFlowMgr.GetPacketOutGemPortID() error = %v, wantErr %v", err, tt.wantErr)
					return
				}
				if got != tt.want {
					t.Errorf("OpenOltFlowMgr.GetPacketOutGemPortID() = %v, want %v", got, tt.want)
				}
			}
		})
	}
}

func TestOpenOltFlowMgr_DeleteTechProfileInstance(t *testing.T) {
	type args struct {
		intfID uint32
		onuID  uint32
		uniID  uint32
		sn     string
		tpID   uint32
	}
	tests := []struct {
		name    string
		args    args
		wantErr bool
	}{
		// TODO: Add test cases.
		{"DeleteTechProfileInstance", args{intfID: 0, onuID: 1, uniID: 1, sn: "", tpID: 64}, false},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := flowMgr[tt.args.intfID].DeleteTechProfileInstance(ctx, tt.args.intfID, tt.args.onuID, tt.args.uniID, tt.args.sn, tt.args.tpID); (err != nil) != tt.wantErr {
				t.Errorf("OpenOltFlowMgr.DeleteTechProfileInstance() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

func TestOpenOltFlowMgr_checkAndAddFlow(t *testing.T) {
	ctx := context.Background()
	kw := make(map[string]uint64)
	kw["table_id"] = 1
	kw["meter_id"] = 1
	kw["write_metadata"] = 0x4000000000 // Tech-Profile-ID 64

	// Upstream flow
	fa := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			fu.IpProto(17), // dhcp
			fu.VlanPcp(0),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(16777216),
			fu.PushVlan(0x8100),
		},
		KV: kw,
	}

	// EAPOL
	fa2 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			fu.EthType(0x888E),
			fu.VlanPcp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(16777216),
			fu.PushVlan(0x8100),
		},
		KV: kw,
	}

	// HSIA
	fa3 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			//fu.EthType(0x8100),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT))),
			fu.Output(16777216),
			fu.PushVlan(0x8100),
		},
		KV: kw,
	}

	fa4 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(16777216),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
			fu.VlanPcp(1),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT))),
			fu.Output(536870912),
			fu.PopVlan(),
		},
		KV: kw,
	}

	// PPPOED
	pppoedFA := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			fu.EthType(0x8863),
			fu.VlanPcp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257),
		},
		Actions: []*ofp.OfpAction{
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(16777216),
			fu.PushVlan(0x8100),
		},
		KV: kw,
	}

	classifierInfo := make(map[string]interface{})
	actionInfo := make(map[string]interface{})
	classifierInfo2 := make(map[string]interface{})
	actionInfo2 := make(map[string]interface{})
	classifierInfo3 := make(map[string]interface{})
	actionInfo3 := make(map[string]interface{})
	classifierInfo4 := make(map[string]interface{})
	actionInfo4 := make(map[string]interface{})
	classifierInfo5 := make(map[string]interface{})
	actionInfo5 := make(map[string]interface{})
	flow, _ := fu.MkFlowStat(fa)
	flow2, _ := fu.MkFlowStat(fa2)
	flow3, _ := fu.MkFlowStat(fa3)
	flow4, _ := fu.MkFlowStat(fa4)
	flow5, _ := fu.MkFlowStat(pppoedFA)
	formulateClassifierInfoFromFlow(ctx, classifierInfo, flow)
	formulateClassifierInfoFromFlow(ctx, classifierInfo2, flow2)
	formulateClassifierInfoFromFlow(ctx, classifierInfo3, flow3)
	formulateClassifierInfoFromFlow(ctx, classifierInfo4, flow4)
	formulateClassifierInfoFromFlow(ctx, classifierInfo5, flow5)

	err := formulateActionInfoFromFlow(ctx, actionInfo, classifierInfo, flow)
	if err != nil {
		// Error logging is already done in the called function
		// So just return in case of error
		return
	}

	err = formulateActionInfoFromFlow(ctx, actionInfo2, classifierInfo2, flow2)
	if err != nil {
		// Error logging is already done in the called function
		// So just return in case of error
		return
	}

	err = formulateActionInfoFromFlow(ctx, actionInfo3, classifierInfo3, flow3)
	if err != nil {
		// Error logging is already done in the called function
		// So just return in case of error
		return
	}

	err = formulateActionInfoFromFlow(ctx, actionInfo4, classifierInfo4, flow4)
	if err != nil {
		// Error logging is already done in the called function
		// So just return in case of error
		return
	}

	err = formulateActionInfoFromFlow(ctx, actionInfo5, classifierInfo5, flow5)
	if err != nil {
		// Error logging is already done in the called function
		// So just return in case of error
		return
	}
	/*
		usGemList := make([]*tp_pb.GemPortAttributes, 4)
		usGemList = append(usGemList, &tp_pb.GemPortAttributes{})
		usGemList = append(usGemList, &tp_pb.GemPortAttributes{})
		usGemList = append(usGemList, &tp_pb.GemPortAttributes{})
		usGemList = append(usGemList, &tp_pb.GemPortAttributes{})
		dsGemList := make([]*tp_pb.GemPortAttributes, 4)
		dsGemList = append(usGemList, &tp_pb.GemPortAttributes{})
		dsGemList = append(usGemList, &tp_pb.GemPortAttributes{})
		dsGemList = append(usGemList, &tp_pb.GemPortAttributes{})
		dsGemList = append(usGemList, &tp_pb.GemPortAttributes{})
	*/
	TpInst := &tp_pb.TechProfileInstance{
		Name:                 "Test-Tech-Profile",
		SubscriberIdentifier: "257",
		ProfileType:          "Mock",
		Version:              1,
		NumGemPorts:          4,
		InstanceControl: &tp_pb.InstanceControl{
			Onu: "1",
			Uni: "16",
		},
		UsScheduler: &tp_pb.SchedulerAttributes{},
		DsScheduler: &tp_pb.SchedulerAttributes{},
	}
	TpInst.UsScheduler.Priority = 1
	TpInst.UsScheduler.Direction = tp_pb.Direction_UPSTREAM
	TpInst.UsScheduler.AllocId = 1
	TpInst.UsScheduler.AdditionalBw = tp_pb.AdditionalBW_AdditionalBW_None
	TpInst.UsScheduler.QSchedPolicy = tp_pb.SchedulingPolicy_WRR
	TpInst.UsScheduler.Weight = 4

	TpInst.DsScheduler.Priority = 1
	TpInst.DsScheduler.Direction = tp_pb.Direction_DOWNSTREAM
	TpInst.DsScheduler.AllocId = 1
	TpInst.DsScheduler.AdditionalBw = tp_pb.AdditionalBW_AdditionalBW_None
	TpInst.DsScheduler.QSchedPolicy = tp_pb.SchedulingPolicy_WRR
	TpInst.DsScheduler.Weight = 4
	TpInst.UpstreamGemPortAttributeList = make([]*tp_pb.GemPortAttributes, 0)
	TpInst.UpstreamGemPortAttributeList = append(TpInst.UpstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 1, PbitMap: "0b00000011"})
	TpInst.UpstreamGemPortAttributeList = append(TpInst.UpstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 2, PbitMap: "0b00001100"})
	TpInst.UpstreamGemPortAttributeList = append(TpInst.UpstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 3, PbitMap: "0b00110000"})
	TpInst.UpstreamGemPortAttributeList = append(TpInst.UpstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 4, PbitMap: "0b11000000"})

	TpInst.DownstreamGemPortAttributeList = make([]*tp_pb.GemPortAttributes, 0)
	TpInst.DownstreamGemPortAttributeList = append(TpInst.DownstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 1, PbitMap: "0b00000011"})
	TpInst.DownstreamGemPortAttributeList = append(TpInst.DownstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 2, PbitMap: "0b00001100"})
	TpInst.DownstreamGemPortAttributeList = append(TpInst.DownstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 3, PbitMap: "0b00110000"})
	TpInst.DownstreamGemPortAttributeList = append(TpInst.DownstreamGemPortAttributeList, &tp_pb.GemPortAttributes{GemportId: 4, PbitMap: "0b11000000"})

	type args struct {
		args           map[string]uint32
		classifierInfo map[string]interface{}
		actionInfo     map[string]interface{}
		flow           *ofp.OfpFlowStats
		gemPort        uint32
		intfID         uint32
		onuID          uint32
		uniID          uint32
		portNo         uint32
		TpInst         *tp_pb.TechProfileInstance
		allocID        []uint32
		gemPorts       []uint32
		TpID           uint32
		uni            string
	}
	tests := []struct {
		name string
		args args
	}{
		{
			name: "checkAndAddFlow-1",
			args: args{
				args:           nil,
				classifierInfo: classifierInfo,
				actionInfo:     actionInfo,
				flow:           flow,
				gemPort:        1,
				intfID:         1,
				onuID:          1,
				uniID:          16,
				portNo:         1,
				TpInst:         TpInst,
				allocID:        []uint32{0x8001},
				gemPorts:       []uint32{1, 2, 3, 4},
				TpID:           64,
				uni:            "16",
			},
		},
		{
			name: "checkAndAddFlow-2",
			args: args{
				args:           nil,
				classifierInfo: classifierInfo2,
				actionInfo:     actionInfo2,
				flow:           flow2,
				gemPort:        1,
				intfID:         1,
				onuID:          1,
				uniID:          16,
				portNo:         1,
				TpInst:         TpInst,
				allocID:        []uint32{0x8001},
				gemPorts:       []uint32{1, 2, 3, 4},
				TpID:           64,
				uni:            "16",
			},
		},
		{
			name: "checkAndAddFlow-3",
			args: args{
				args:           nil,
				classifierInfo: classifierInfo3,
				actionInfo:     actionInfo3,
				flow:           flow3,
				gemPort:        1,
				intfID:         1,
				onuID:          1,
				uniID:          16,
				portNo:         1,
				TpInst:         TpInst,
				allocID:        []uint32{0x8001},
				gemPorts:       []uint32{1, 2, 3, 4},
				TpID:           64,
				uni:            "16",
			},
		},
		{
			name: "checkAndAddFlow-4",
			args: args{
				args:           nil,
				classifierInfo: classifierInfo4,
				actionInfo:     actionInfo4,
				flow:           flow4,
				gemPort:        1,
				intfID:         1,
				onuID:          1,
				uniID:          16,
				portNo:         1,
				TpInst:         TpInst,
				allocID:        []uint32{0x8001},
				gemPorts:       []uint32{1, 2, 3, 4},
				TpID:           64,
				uni:            "16",
			},
		},
		{
			name: "checkAndAddFlow-5",
			args: args{
				args:           nil,
				classifierInfo: classifierInfo5,
				actionInfo:     actionInfo5,
				flow:           flow5,
				gemPort:        1,
				intfID:         1,
				onuID:          1,
				uniID:          16,
				portNo:         1,
				TpInst:         TpInst,
				allocID:        []uint32{0x8001},
				gemPorts:       []uint32{1, 2, 3, 4},
				TpID:           64,
				uni:            "16",
			},
		},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := flowMgr[tt.args.intfID].checkAndAddFlow(ctx, tt.args.args, tt.args.classifierInfo, tt.args.actionInfo, tt.args.flow,
				tt.args.TpInst, tt.args.gemPorts, tt.args.TpID, tt.args.uni)
			if err != nil {
				t.Error("check-and-add-flow failed", err)
				return
			}
		})
	}
}

func TestOpenOltFlowMgr_TestMulticastFlowAndGroup(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	//create group
	group := newGroup(2, []uint32{1})
	err := flowMgr[0].grpMgr.AddGroup(ctx, group)
	if err != nil {
		t.Error("group-add failed", err)
		return
	}
	//create multicast flow
	multicastFlowArgs := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(16777216),
			fu.VlanVid(660),             //vlan
			fu.Metadata_ofp(uint64(66)), //inner vlan
			fu.EthType(0x800),           //ipv4
			fu.Ipv4Dst(3809869825),      //227.22.0.1
		},
		Actions: []*ofp.OfpAction{
			fu.Group(1),
		},
	}
	ofpStats, _ := fu.MkFlowStat(multicastFlowArgs)
	fmt.Println(ofpStats.Id)
	err = flowMgr[0].AddFlow(ctx, ofpStats, &ofp.FlowMetadata{})
	if err != nil {
		t.Error("Multicast flow-add failed", err)
		return
	}

	//add bucket to the group
	group = newGroup(2, []uint32{1, 2})
	err = flowMgr[0].grpMgr.ModifyGroup(ctx, group)
	if err != nil {
		t.Error("modify-group failed", err)
		return
	}
	//remove the multicast flow
	err = flowMgr[0].RemoveFlow(ctx, ofpStats)
	if err != nil {
		t.Error("Multicast flow-remove failed", err)
		return
	}

	//remove the group
	err = flowMgr[0].grpMgr.DeleteGroup(ctx, group)
	if err != nil {
		t.Error("delete-group failed", err)
		return
	}
}

func TestOpenOltFlowMgr_TestRouteFlowToOnuChannel(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	log.SetPackageLogLevel("github.com/opencord/voltha-openolt-adapter/internal/pkg/core", log.DebugLevel)
	log.SetPackageLogLevel("github.com/opencord/voltha-openolt-adapter/internal/pkg/resourcemanager", log.DebugLevel)
	log.SetPackageLogLevel("github.com/opencord/voltha-openolt-adapter/pkg/mocks", log.DebugLevel)
	kwTable1Meter1 := make(map[string]uint64)
	kwTable1Meter1["table_id"] = 1
	kwTable1Meter1["meter_id"] = 1
	kwTable1Meter1["write_metadata"] = 0x4000000000 // Tech-Profile-ID 64

	kwTable0Meter1 := make(map[string]uint64)
	kwTable0Meter1["table_id"] = 0
	kwTable0Meter1["meter_id"] = 1
	kwTable0Meter1["write_metadata"] = 0x4000000000 // Tech-Profile-ID 64

	flowMetadata1 := ofp.FlowMetadata{Meters: []*ofp.OfpMeterConfig{
		{
			Flags:   5,
			MeterId: 1,
			Bands: []*ofp.OfpMeterBandHeader{
				{
					Type:      ofp.OfpMeterBandType_OFPMBT_DROP,
					Rate:      16000,
					BurstSize: 0,
				},
				{
					Type:      ofp.OfpMeterBandType_OFPMBT_DROP,
					Rate:      32000,
					BurstSize: 30,
				},
				{
					Type:      ofp.OfpMeterBandType_OFPMBT_DROP,
					Rate:      64000,
					BurstSize: 30,
				},
			},
		},
	}}

	// Downstream LLDP Trap from NNI0 flow
	fa0 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(16777216),
			fu.EthType(35020),
		},
		Actions: []*ofp.OfpAction{
			fu.Output(4294967293),
		},
		KV: make(map[string]uint64),
	}

	// Upstream flow DHCP flow - ONU1 UNI0 PON0
	fa1 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			fu.IpProto(17), // dhcp
			fu.VlanPcp(0),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(2147483645),
			fu.PushVlan(0x8100),
		},
		KV: kwTable1Meter1,
	}

	// Upstream EAPOL - ONU1 UNI0 PON0
	fa2 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			fu.EthType(0x888E),
			fu.VlanPcp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(2147483645),
			fu.PushVlan(0x8100),
		},
		KV: kwTable1Meter1,
	}

	// Upstream HSIA - ONU1 UNI0 PON0
	fa3 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			//fu.EthType(0x8100),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT))),
			fu.Output(16777216),
			fu.PushVlan(0x8100),
		},
		KV: kwTable1Meter1,
	}

	// Downstream HSIA - ONU1 UNI0 PON0
	fa4 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(16777216),
			fu.Metadata_ofp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
			fu.VlanPcp(1),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT))),
			fu.Output(536870912),
			fu.PopVlan(),
		},
		KV: kwTable0Meter1,
	}

	// Upstream flow DHCP flow - ONU1 UNI0 PON15
	fa5 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870927),
			fu.Metadata_ofp(1),
			fu.IpProto(17), // dhcp
			fu.VlanPcp(0),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT)),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 259)),
			fu.Output(2147483645),
			fu.PushVlan(0x8100),
		},
		KV: kwTable1Meter1,
	}

	// Upstream EAPOL - ONU1 UNI0 PON15
	fa6 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870927),
			fu.Metadata_ofp(1),
			fu.EthType(0x888E),
			fu.VlanPcp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 259),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(2147483645),
			fu.PushVlan(0x8100),
		},
		KV: kwTable1Meter1,
	}

	// Upstream PPPOED - ONU1 UNI0 PON0
	fa7 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870912),
			fu.Metadata_ofp(1),
			fu.EthType(0x8863),
			fu.VlanPcp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(2147483645),
			fu.PushVlan(0x8100),
		},
		KV: kwTable1Meter1,
	}

	// Upstream PPPOED - ONU1 UNI0 PON15
	fa8 := &fu.FlowArgs{
		MatchFields: []*ofp.OfpOxmOfbField{
			fu.InPort(536870927),
			fu.Metadata_ofp(1),
			fu.EthType(0x8863),
			fu.VlanPcp(1),
			fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 259),
			fu.TunnelId(256),
		},
		Actions: []*ofp.OfpAction{
			//fu.SetField(fu.Metadata_ofp(uint64(ofp.OfpInstructionType_OFPIT_WRITE_METADATA | 2))),
			fu.SetField(fu.VlanVid(uint32(ofp.OfpVlanId_OFPVID_PRESENT) | 257)),
			fu.Output(2147483645),
			fu.PushVlan(0x8100),
		},
		KV: kwTable1Meter1,
	}
	flow0, _ := fu.MkFlowStat(fa0)
	flow1, _ := fu.MkFlowStat(fa1)
	flow2, _ := fu.MkFlowStat(fa2)
	flow3, _ := fu.MkFlowStat(fa3)
	flow4, _ := fu.MkFlowStat(fa4)

	flow5, _ := fu.MkFlowStat(fa5)
	flow6, _ := fu.MkFlowStat(fa6)
	flow7, _ := fu.MkFlowStat(fa7)
	flow8, _ := fu.MkFlowStat(fa8)

	type args struct {
		ctx          context.Context
		flow         *ofp.OfpFlowStats
		addFlow      bool
		flowMetadata *ofp.FlowMetadata
	}
	tests := []struct {
		name        string
		args        args
		wantErr     bool
		returnedErr error
	}{
		{
			name: "RouteFlowToOnuChannel-0",
			args: args{
				ctx:          ctx,
				flow:         flow0,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-1",
			args: args{
				ctx:          ctx,
				flow:         flow1,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-2",
			args: args{
				ctx:          ctx,
				flow:         flow2,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-3",
			args: args{
				ctx:          ctx,
				flow:         flow3,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-4",
			args: args{
				ctx:          ctx,
				flow:         flow4,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-5",
			args: args{
				ctx:          ctx,
				flow:         flow1,
				addFlow:      false,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-6",
			args: args{
				ctx:          ctx,
				flow:         flow1,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-7",
			args: args{
				ctx:          ctx,
				flow:         flow5,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-8",
			args: args{
				ctx:          ctx,
				flow:         flow6,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-9",
			args: args{
				ctx:          ctx,
				flow:         flow7,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-10",
			args: args{
				ctx:          ctx,
				flow:         flow8,
				addFlow:      true,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
		{
			name: "RouteFlowToOnuChannel-11", // Test Remove trap-from-nni LLDP flow
			args: args{
				ctx:          ctx,
				flow:         flow0,
				addFlow:      false,
				flowMetadata: &flowMetadata1,
			},
			wantErr: false,
		},
	}

	var wg sync.WaitGroup
	defer wg.Wait() // wait for all go routines to complete
	for _, tt := range tests {
		wg.Add(1) // one per go routine
		// The flows needs to be pushed in a particular order as they are stateful - meaning a flow delete can happen only if a flow add was done
		// This delay is needed so that flows arrive in order. Otherwise if all flows are pushed at once the go routine can get scheduled
		// in random order causing flows to come out of order and test fails
		time.Sleep(5 * time.Millisecond)
		t.Run(tt.name, func(t *testing.T) {
			defer wg.Done()
			tt.returnedErr = flowMgr[0].RouteFlowToOnuChannel(tt.args.ctx, tt.args.flow, tt.args.addFlow, tt.args.flowMetadata)
			if (tt.wantErr == false && tt.returnedErr != nil) || (tt.wantErr == true && tt.returnedErr == nil) {
				t.Errorf("OpenOltFlowMgr.RouteFlowToOnuChannel() error = %v, wantErr %v", tt.returnedErr, tt.wantErr)
			}
		})
	}
}