diff --git a/internal/pkg/afrouter/affinity-router_test.go b/internal/pkg/afrouter/affinity-router_test.go
new file mode 100644
index 0000000..dfcefc0
--- /dev/null
+++ b/internal/pkg/afrouter/affinity-router_test.go
@@ -0,0 +1,444 @@
+/*
+ * Portions copyright 2019-present Open Networking Foundation
+ * Original copyright 2019-present Ciena Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the"github.com/stretchr/testify/assert" "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 afrouter
+
+import (
+	"fmt"
+	"github.com/golang/protobuf/proto"
+	"github.com/opencord/voltha-go/common/log"
+	common_pb "github.com/opencord/voltha-protos/go/common"
+	voltha_pb "github.com/opencord/voltha-protos/go/voltha"
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc"
+	"testing"
+)
+
+const (
+	AFFINITY_ROUTER_PROTOFILE = "../../../vendor/github.com/opencord/voltha-protos/go/voltha.pb"
+)
+
+// Unit test initialization
+func init() {
+	// Logger must be configured or bad things happen
+	log.SetDefaultLogger(log.JSON, log.DebugLevel, nil)
+	log.AddPackage(log.JSON, log.WarnLevel, nil)
+}
+
+// Build an affinity router configuration
+func MakeAffinityTestConfig(numBackends int, numConnections int) (*RouteConfig, *RouterConfig) {
+
+	var backends []BackendConfig
+	for backendIndex := 0; backendIndex < numBackends; backendIndex++ {
+		var connections []ConnectionConfig
+		for connectionIndex := 0; connectionIndex < numConnections; connectionIndex++ {
+			connectionConfig := ConnectionConfig{
+				Name: fmt.Sprintf("rw_vcore%d%d", backendIndex, connectionIndex+1),
+				Addr: "foo",
+				Port: "123",
+			}
+			connections = append(connections, connectionConfig)
+		}
+
+		backendConfig := BackendConfig{
+			Name:        fmt.Sprintf("rw_vcore%d", backendIndex),
+			Type:        BackendSingleServer,
+			Connections: connections,
+		}
+
+		backends = append(backends, backendConfig)
+	}
+
+	backendClusterConfig := BackendClusterConfig{
+		Name:     "vcore",
+		Backends: backends,
+	}
+
+	routeConfig := RouteConfig{
+		Name:             "dev_manager",
+		Type:             RouteTypeRpcAffinityMessage,
+		Association:      AssociationRoundRobin,
+		BackendCluster:   "vcore",
+		backendCluster:   &backendClusterConfig,
+		RouteField:       "id",
+		Methods:          []string{"CreateDevice", "EnableDevice"},
+		NbBindingMethods: []string{"CreateDevice"},
+	}
+
+	routerConfig := RouterConfig{
+		Name:         "vcore",
+		ProtoService: "VolthaService",
+		ProtoPackage: "voltha",
+		Routes:       []RouteConfig{routeConfig},
+		ProtoFile:    AFFINITY_ROUTER_PROTOFILE,
+	}
+	return &routeConfig, &routerConfig
+}
+
+// Route() requires an open connection, so pretend we have one.
+func PretendAffinityOpenConnection(router Router, clusterName string, backendIndex int, connectionName string) {
+	cluster := router.FindBackendCluster(clusterName)
+
+	// Route Method expects an open connection
+	conn := cluster.backends[backendIndex].connections[connectionName]
+	cluster.backends[backendIndex].openConns[conn] = &grpc.ClientConn{}
+}
+
+// Common setup to run before each unit test
+func AffinityTestSetup() {
+	// reset globals that need to be clean for each unit test
+
+	clusters = make(map[string]*cluster)
+	allRouters = make(map[string]Router)
+}
+
+// Test creation of a new AffinityRouter, and the Service(), Name(), FindBackendCluster(), and
+// methods.
+func TestAffinityRouterInit(t *testing.T) {
+	AffinityTestSetup()
+
+	routeConfig, routerConfig := MakeAffinityTestConfig(1, 1)
+
+	router, err := newAffinityRouter(routerConfig, routeConfig)
+
+	assert.NotNil(t, router)
+	assert.Nil(t, err)
+
+	assert.Equal(t, router.Service(), "VolthaService")
+	assert.Equal(t, router.Name(), "dev_manager")
+
+	cluster, err := router.BackendCluster("foo", "bar")
+	assert.Equal(t, cluster, clusters["vcore"])
+	assert.Nil(t, err)
+
+	assert.Equal(t, router.FindBackendCluster("vcore"), clusters["vcore"])
+}
+
+// Should throw error if no name in configuration
+func TestAffinityRouterInitNoName(t *testing.T) {
+	AffinityTestSetup()
+
+	routeConfig, routerConfig := MakeAffinityTestConfig(1, 1)
+	routeConfig.Name = ""
+
+	_, err := newAffinityRouter(routerConfig, routeConfig)
+
+	assert.EqualError(t, err, "Failed to create a new router ''")
+}
+
+// Should thow error if now ProtoPackage in configuration
+func TestAffinityRouterInitNoProtoPackage(t *testing.T) {
+	AffinityTestSetup()
+
+	routeConfig, routerConfig := MakeAffinityTestConfig(1, 1)
+	routerConfig.ProtoPackage = ""
+
+	_, err := newAffinityRouter(routerConfig, routeConfig)
+
+	assert.EqualError(t, err, "Failed to create a new router 'dev_manager'")
+}
+
+// Should throw error if no ProtoServer in configuration
+func TestAffinityRouterInitNoProtoService(t *testing.T) {
+	AffinityTestSetup()
+
+	routeConfig, routerConfig := MakeAffinityTestConfig(1, 1)
+	routerConfig.ProtoService = ""
+
+	_, err := newAffinityRouter(routerConfig, routeConfig)
+
+	assert.EqualError(t, err, "Failed to create a new router 'dev_manager'")
+}
+
+// Tests a cluster with only one Backend
+func TestAffinityRouteOne(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(1, 1)
+
+	router, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	PretendAffinityOpenConnection(router, "vcore", 0, "rw_vcore01")
+
+	idMessage := &common_pb.ID{Id: "1234"}
+
+	idData, err := proto.Marshal(idMessage)
+	assert.Nil(t, err)
+
+	sel := &requestFrame{payload: idData,
+		err:        nil,
+		metaKey:    NoMeta,
+		methodInfo: newMethodDetails("/voltha.VolthaService/EnableDevice")}
+
+	backend, connection := router.Route(sel)
+
+	assert.Nil(t, sel.err)
+	assert.NotNil(t, backend)
+	assert.Equal(t, "rw_vcore0", backend.name)
+	assert.Nil(t, connection)
+
+	// Since we only have one backend, calling Route a second time should return the same one
+
+	backend, connection = router.Route(sel)
+
+	assert.Nil(t, sel.err)
+	assert.NotNil(t, backend)
+	assert.Equal(t, "rw_vcore0", backend.name)
+	assert.Nil(t, connection)
+}
+
+// Tests a cluster with two Backends
+func TestAffinityRouteTwo(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(2, 1)
+
+	router, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	PretendAffinityOpenConnection(router, "vcore", 0, "rw_vcore01")
+	PretendAffinityOpenConnection(router, "vcore", 1, "rw_vcore11")
+
+	idMessage := &common_pb.ID{Id: "1234"}
+	idData, err := proto.Marshal(idMessage)
+	assert.Nil(t, err)
+
+	sel := &requestFrame{payload: idData,
+		err:        nil,
+		metaKey:    NoMeta,
+		methodInfo: newMethodDetails("/voltha.VolthaService/EnableDevice")}
+
+	// We should Route to the first core and bind affinity to it
+
+	backend, connection := router.Route(sel)
+
+	assert.Nil(t, sel.err)
+	assert.NotNil(t, backend)
+	assert.Equal(t, "rw_vcore0", backend.name)
+	assert.Nil(t, connection)
+
+	// We should have established affinity, and trying Route again should return the same core
+
+	backend, connection = router.Route(sel)
+
+	assert.Nil(t, sel.err)
+	assert.NotNil(t, backend)
+	assert.Equal(t, "rw_vcore0", backend.name)
+	assert.Nil(t, connection)
+
+	// Make up a message with a different id
+	idMessage = &common_pb.ID{Id: "1235"}
+	idData, err = proto.Marshal(idMessage)
+	assert.Nil(t, err)
+
+	sel = &requestFrame{payload: idData,
+		err:        nil,
+		metaKey:    NoMeta,
+		methodInfo: newMethodDetails("/voltha.VolthaService/EnableDevice")}
+
+	// Calling Route with the new ID should cause it to bind affinity to the second core
+
+	backend, connection = router.Route(sel)
+
+	assert.Nil(t, sel.err)
+	assert.NotNil(t, backend)
+	assert.Equal(t, "rw_vcore1", backend.name)
+	assert.Nil(t, connection)
+}
+
+// Tests a cluster with one backend but no open connections
+func TestAffinityRouteOneNoOpenConnection(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(1, 1)
+
+	router, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	idMessage := &common_pb.ID{Id: "1234"}
+
+	idData, err := proto.Marshal(idMessage)
+	assert.Nil(t, err)
+
+	sel := &requestFrame{payload: idData,
+		err:        nil,
+		metaKey:    NoMeta,
+		methodInfo: newMethodDetails("/voltha.VolthaService/EnableDevice")}
+
+	backend, connection := router.Route(sel)
+
+	assert.EqualError(t, sel.err, "No backend with open connections found")
+	assert.Nil(t, backend)
+	assert.Nil(t, connection)
+}
+
+// Tests binding on reply
+func TestAffinityRouteReply(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(2, 1)
+
+	router, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	// Get the created AffinityRouter so we can inspect its state
+	aRouter := allRouters["vcoredev_manager"].(AffinityRouter)
+
+	PretendAffinityOpenConnection(router, "vcore", 0, "rw_vcore01")
+	PretendAffinityOpenConnection(router, "vcore", 1, "rw_vcore11")
+
+	idMessage := &voltha_pb.Device{Id: "1234"}
+	idData, err := proto.Marshal(idMessage)
+	assert.Nil(t, err)
+
+	// Note that sel.backend must be set. As this is a response, it must
+	// have come from a backend and that backend must be known.
+
+	sel := &responseFrame{payload: idData,
+		metaKey: NoMeta,
+		backend: router.FindBackendCluster("vcore").backends[0],
+		method:  "CreateDevice",
+	}
+
+	// affinity should be unset as we have not routed yet
+	assert.Empty(t, aRouter.affinity)
+
+	err = aRouter.ReplyHandler(sel)
+	assert.Nil(t, err)
+
+	// affinity should now be set
+	assert.NotEmpty(t, aRouter.affinity)
+	assert.Equal(t, router.FindBackendCluster("vcore").backends[0], aRouter.affinity["1234"])
+}
+
+// Tests binding on reply, with incorrect frame type
+func TestAffinityRouteReplyIncorrectFrame(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(2, 1)
+
+	router, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	// Get the created AffinityRouter so we can inspect its state
+	aRouter := allRouters["vcoredev_manager"].(AffinityRouter)
+
+	PretendAffinityOpenConnection(router, "vcore", 0, "rw_vcore01")
+	PretendAffinityOpenConnection(router, "vcore", 1, "rw_vcore11")
+
+	idMessage := &voltha_pb.Device{Id: "1234"}
+	idData, err := proto.Marshal(idMessage)
+	assert.Nil(t, err)
+
+	sel := &requestFrame{payload: idData,
+		err:        nil,
+		metaKey:    NoMeta,
+		methodInfo: newMethodDetails("/voltha.VolthaService/EnableDevice"),
+	}
+
+	// ReplyHandler expects a replyFrame and we're giving it a requestFrame instead
+
+	err = aRouter.ReplyHandler(sel)
+	assert.EqualError(t, err, "Internal: invalid data type in ReplyHander call &{[10 4 49 50 51 52] <nil> <nil> <nil> <nil> {/voltha.VolthaService/EnableDevice voltha VolthaService EnableDevice}  nometa }")
+}
+
+func TestAffinityRouterDecodeProtoField(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(2, 1)
+
+	_, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	// Get the created AffinityRouter so we can inspect its state
+	aRouter := allRouters["vcoredev_manager"].(AffinityRouter)
+
+	// Pick something to test with lots of field types. Port is a good candidate.
+	portMessage := &voltha_pb.Port{PortNo: 123,
+		Label:     "testlabel",
+		Type:      3,
+		DeviceId:  "5678",
+		RxPackets: 9876,
+	}
+
+	portData, err := proto.Marshal(portMessage)
+	assert.Nil(t, err)
+
+	/*
+	 * Decode various fields in the protobuf. Decoding each subsequent
+	 * field implies skipfield() is called on its predecessor.
+	 */
+
+	s, err := aRouter.decodeProtoField(portData, 1) // field 1 is PortNo
+	assert.Equal(t, "123", s)
+
+	// Test VOL-1882, skipping of varint field. Note: May cause infinite loop if not fixed!
+	s, err = aRouter.decodeProtoField(portData, 2) // field 2 is Label
+	assert.Equal(t, "testlabel", s)
+
+	s, err = aRouter.decodeProtoField(portData, 3) // field 3 is PortType
+	assert.Equal(t, "3", s)
+
+	s, err = aRouter.decodeProtoField(portData, 7) // field 7 is DeviceId
+	assert.Equal(t, "5678", s)
+
+	// TODO: Seems like an int64 ought to be allowed...
+	s, err = aRouter.decodeProtoField(portData, 9) // field 7 is RxPackets
+	assert.EqualError(t, err, "Only integer and string route selectors are permitted")
+}
+
+// Test setting affinity for a key to a backend
+func TestAffinitySetAffinity(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(2, 1)
+
+	router, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	// Get the created AffinityRouter so we can inspect its state
+	aRouter := allRouters["vcoredev_manager"].(AffinityRouter)
+
+	backend := router.FindBackendCluster("vcore").backends[0]
+	err = aRouter.setAffinity("1234", backend)
+
+	assert.Nil(t, err)
+}
+
+// Trying to set affinity when it has already been set should fail.
+func TestAffinitySetAffinityChange(t *testing.T) {
+	AffinityTestSetup()
+
+	_, routerConfig := MakeAffinityTestConfig(2, 1)
+
+	router, err := newRouter(routerConfig)
+	assert.Nil(t, err)
+
+	// Get the created AffinityRouter so we can inspect its state
+	aRouter := allRouters["vcoredev_manager"].(AffinityRouter)
+
+	backend := router.FindBackendCluster("vcore").backends[0]
+	err = aRouter.setAffinity("1234", backend)
+
+	assert.Nil(t, err)
+
+	// Now pick a different backend
+	backend = router.FindBackendCluster("vcore").backends[1]
+	err = aRouter.setAffinity("1234", backend)
+
+	assert.EqualError(t, err, "Attempting multiple sets of affinity for key 1234 to backend rw_vcore1 from rw_vcore0 on router dev_manager")
+}