[VOL-1035] Initial submission of flow decomposition code.
Additional test cases will follow to test the core of the flow
decomposition functionality

Change-Id: Ie685714ce5ab54ac89501a67f9489613de195c15
diff --git a/rw_core/graph/device_graph_test.go b/rw_core/graph/device_graph_test.go
new file mode 100644
index 0000000..533d03d
--- /dev/null
+++ b/rw_core/graph/device_graph_test.go
@@ -0,0 +1,171 @@
+/*
+ * 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 graph
+
+import (
+	"errors"
+	"fmt"
+	"github.com/opencord/voltha-go/protos/openflow_13"
+	"github.com/opencord/voltha-go/protos/voltha"
+	"github.com/stretchr/testify/assert"
+	"testing"
+	"time"
+)
+
+var ld voltha.LogicalDevice
+var olt voltha.Device
+var onusOnPort4 []voltha.Device
+var onusOnPort5 []voltha.Device
+
+const (
+	maxOnuOnPort4 int = 64
+	maxOnuOnPort5 int = 64
+)
+
+func init() {
+
+	logicalDeviceId := "ld"
+	oltDeviceId := "olt"
+
+	// Setup ONUs on OLT port 4
+	onusOnPort4 = make([]voltha.Device, 0)
+	var onu voltha.Device
+	var id string
+	oltPeerPort := uint32(4)
+	for i := 0; i < maxOnuOnPort4; i++ {
+		id := fmt.Sprintf("onu%d", i)
+		onu = voltha.Device{Id: id, ParentId: oltDeviceId}
+		ponPort := voltha.Port{PortNo: 1, DeviceId: onu.Id, Type: voltha.Port_PON_ONU}
+		ponPort.Peers = make([]*voltha.Port_PeerPort, 0)
+		peerPort := voltha.Port_PeerPort{DeviceId: oltDeviceId, PortNo: oltPeerPort}
+		ponPort.Peers = append(ponPort.Peers, &peerPort)
+		uniPort := voltha.Port{PortNo: 2, DeviceId: onu.Id, Type: voltha.Port_ETHERNET_UNI}
+		onu.Ports = make([]*voltha.Port, 0)
+		onu.Ports = append(onu.Ports, &ponPort)
+		onu.Ports = append(onu.Ports, &uniPort)
+		onusOnPort4 = append(onusOnPort4, onu)
+	}
+
+	// Setup ONUs on OLT port 5
+	onusOnPort5 = make([]voltha.Device, 0)
+	oltPeerPort = uint32(5)
+	for i := 0; i < maxOnuOnPort5; i++ {
+		id := fmt.Sprintf("onu%d", i+maxOnuOnPort4)
+		onu = voltha.Device{Id: id, ParentId: oltDeviceId}
+		ponPort := voltha.Port{PortNo: 1, DeviceId: onu.Id, Type: voltha.Port_PON_ONU}
+		ponPort.Peers = make([]*voltha.Port_PeerPort, 0)
+		peerPort := voltha.Port_PeerPort{DeviceId: oltDeviceId, PortNo: oltPeerPort}
+		ponPort.Peers = append(ponPort.Peers, &peerPort)
+		uniPort := voltha.Port{PortNo: 2, DeviceId: onu.Id, Type: voltha.Port_ETHERNET_UNI}
+		onu.Ports = make([]*voltha.Port, 0)
+		onu.Ports = append(onu.Ports, &ponPort)
+		onu.Ports = append(onu.Ports, &uniPort)
+		onusOnPort5 = append(onusOnPort5, onu)
+	}
+
+	// Setup OLT
+	//	Setup the OLT device
+	olt = voltha.Device{Id: oltDeviceId, ParentId: logicalDeviceId}
+	p1 := voltha.Port{PortNo: 2, DeviceId: oltDeviceId, Type: voltha.Port_ETHERNET_NNI}
+	p2 := voltha.Port{PortNo: 3, DeviceId: oltDeviceId, Type: voltha.Port_ETHERNET_NNI}
+	p3 := voltha.Port{PortNo: 4, DeviceId: oltDeviceId, Type: voltha.Port_PON_OLT}
+	p4 := voltha.Port{PortNo: 5, DeviceId: oltDeviceId, Type: voltha.Port_PON_OLT}
+	p3.Peers = make([]*voltha.Port_PeerPort, 0)
+	for _, onu := range onusOnPort4 {
+		peerPort := voltha.Port_PeerPort{DeviceId: onu.Id, PortNo: p3.PortNo}
+		p3.Peers = append(p3.Peers, &peerPort)
+	}
+	p4.Peers = make([]*voltha.Port_PeerPort, 0)
+	for _, onu := range onusOnPort5 {
+		peerPort := voltha.Port_PeerPort{DeviceId: onu.Id, PortNo: p4.PortNo}
+		p4.Peers = append(p4.Peers, &peerPort)
+	}
+	olt.Ports = make([]*voltha.Port, 0)
+	olt.Ports = append(olt.Ports, &p1)
+	olt.Ports = append(olt.Ports, &p2)
+	olt.Ports = append(olt.Ports, &p3)
+	olt.Ports = append(olt.Ports, &p4)
+
+	// Setup the logical device
+	ld = voltha.LogicalDevice{Id: logicalDeviceId}
+	ld.Ports = make([]*voltha.LogicalPort, 0)
+	ofpPortNo := 1
+	//Add olt ports
+	for i, port := range olt.Ports {
+		if port.Type == voltha.Port_ETHERNET_NNI {
+			id = fmt.Sprintf("nni-%d", i)
+			lp := voltha.LogicalPort{Id: id, DeviceId: olt.Id, DevicePortNo: port.PortNo, OfpPort: &openflow_13.OfpPort{PortNo: uint32(ofpPortNo)}, RootPort: true}
+			ld.Ports = append(ld.Ports, &lp)
+			ofpPortNo = ofpPortNo + 1
+		}
+	}
+	//Add onu ports on port 4
+	for i, onu := range onusOnPort4 {
+		for _, port := range onu.Ports {
+			if port.Type == voltha.Port_ETHERNET_UNI {
+				id = fmt.Sprintf("uni-%d", i)
+				lp := voltha.LogicalPort{Id: id, DeviceId: onu.Id, DevicePortNo: port.PortNo, OfpPort: &openflow_13.OfpPort{PortNo: uint32(ofpPortNo)}, RootPort: false}
+				ld.Ports = append(ld.Ports, &lp)
+				ofpPortNo = ofpPortNo + 1
+			}
+		}
+	}
+	//Add onu ports on port 5
+	for i, onu := range onusOnPort5 {
+		for _, port := range onu.Ports {
+			if port.Type == voltha.Port_ETHERNET_UNI {
+				id = fmt.Sprintf("uni-%d", i+10)
+				lp := voltha.LogicalPort{Id: id, DeviceId: onu.Id, DevicePortNo: port.PortNo, OfpPort: &openflow_13.OfpPort{PortNo: uint32(ofpPortNo)}, RootPort: false}
+				ld.Ports = append(ld.Ports, &lp)
+				ofpPortNo = ofpPortNo + 1
+			}
+		}
+	}
+}
+
+func GetDeviceHelper(id string) (*voltha.Device, error) {
+	if id == "olt" {
+		return &olt, nil
+	}
+	for _, onu := range onusOnPort4 {
+		if onu.Id == id {
+			return &onu, nil
+		}
+	}
+	for _, onu := range onusOnPort5 {
+		if onu.Id == id {
+			return &onu, nil
+		}
+	}
+	return nil, errors.New("Not-found")
+}
+
+func TestGetRoutes(t *testing.T) {
+
+	getDevice := GetDeviceHelper
+
+	// Create a device graph and computes Routes
+	start := time.Now()
+	dg := NewDeviceGraph(getDevice)
+	dg.ComputeRoutes(ld.Ports)
+	fmt.Println("Total Time creating graph & compute Routes:", time.Since(start))
+	assert.NotNil(t, dg.GGraph)
+	assert.EqualValues(t, (maxOnuOnPort4*4 + maxOnuOnPort5*4), len(dg.Routes))
+	//for k, v := range dg.Routes {
+	//	fmt.Println("key", k, " value:", v)
+	//}
+
+}