pkg/db/backend_test.go - voltha-lib-go - Gitiles

 /*
  * Copyright 2019-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 db

 import (
 	"context"
 	"os"
 	"testing"
 	"time"

 	"github.com/opencord/voltha-lib-go/v3/pkg/mocks"
 	"github.com/phayes/freeport"
 	"github.com/stretchr/testify/assert"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )

 const (
 	embedEtcdServerHost = "localhost"
 	defaultTimeout      = 1
 	defaultPathPrefix   = "Prefix"
 )

 var (
 	embedEtcdServerPort int
 	dummyEtcdServerPort int
 )

 func TestMain(m *testing.M) {
 	var err error
 	embedEtcdServerPort, err = freeport.GetFreePort()
 	if err != nil {
 		logger.Fatal(err)
 	}
 	dummyEtcdServerPort, err = freeport.GetFreePort()
 	if err != nil {
 		logger.Fatal(err)
 	}
 	peerPort, err := freeport.GetFreePort()
 	if err != nil {
 		logger.Fatal(err)
 	}
 	etcdServer := mocks.StartEtcdServer(mocks.MKConfig("voltha.db.test", embedEtcdServerPort, peerPort, "voltha.lib.db", "error"))
 	res := m.Run()

 	etcdServer.Stop()
 	os.Exit(res)
 }

 func provisionBackendWithEmbeddedEtcdServer(t *testing.T) *Backend {
 	backend := NewBackend("etcd", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)
 	assert.NotNil(t, backend)
 	assert.NotNil(t, backend.Client)
 	return backend
 }

 func provisionBackendWithDummyEtcdServer(t *testing.T) *Backend {
 	backend := NewBackend("etcd", embedEtcdServerHost, dummyEtcdServerPort, defaultTimeout, defaultPathPrefix)
 	assert.NotNil(t, backend)
 	assert.NotNil(t, backend.Client)
 	return backend
 }

 // Create instance using Etcd Kvstore
 func TestNewBackend_EtcdKvStore(t *testing.T) {
 	backend := NewBackend("etcd", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)

 	// Verify all attributes of backend have got set correctly
 	assert.NotNil(t, backend)
 	assert.NotNil(t, backend.Client)
 	assert.Equal(t, backend.StoreType, "etcd")
 	assert.Equal(t, backend.Host, embedEtcdServerHost)
 	assert.Equal(t, backend.Port, embedEtcdServerPort)
 	assert.Equal(t, backend.Timeout, defaultTimeout)
 	assert.Equal(t, backend.PathPrefix, defaultPathPrefix)
 	assert.Equal(t, backend.alive, false) // backend is not alive at start
 	assert.Nil(t, backend.liveness)       // no liveness channel is created at start
 	assert.Equal(t, backend.LivenessChannelInterval, DefaultLivenessChannelInterval)
 }

 // Create instance using Consul Kvstore
 func TestNewBackend_ConsulKvStore(t *testing.T) {
 	backend := NewBackend("consul", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)

 	// Verify kvstore type attribute of backend has got set correctly
 	assert.NotNil(t, backend)
 	assert.NotNil(t, backend.Client)
 	assert.Equal(t, backend.StoreType, "consul")
 }

 // Create instance using Invalid Kvstore; instance creation should fail
 func TestNewBackend_InvalidKvstore(t *testing.T) {
 	backend := NewBackend("unknown", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)

 	assert.NotNil(t, backend)
 	assert.Nil(t, backend.Client)
 }

 func TestMakePath(t *testing.T) {
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	path := backend.makePath("Suffix")
 	assert.Equal(t, defaultPathPrefix+"/Suffix", path)
 }

 // Liveness Check against Embedded Etcd Server should return alive state
 func TestPerformLivenessCheck_EmbeddedEtcdServer(t *testing.T) {
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout*time.Second)
 	defer cancel()
 	alive := backend.PerformLivenessCheck(ctx)
 	assert.True(t, alive)
 }

 // Liveness Check against Dummy Etcd Server should return not-alive state
 func TestPerformLivenessCheck_DummyEtcdServer(t *testing.T) {
 	backend := provisionBackendWithDummyEtcdServer(t)
 	ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout*time.Second)
 	defer cancel()
 	alive := backend.PerformLivenessCheck(ctx)
 	assert.False(t, alive)
 }

 // Enabling Liveness Channel before First Liveness Check
 func TestEnableLivenessChannel_EmbeddedEtcdServer_BeforeLivenessCheck(t *testing.T) {
 	backend := provisionBackendWithEmbeddedEtcdServer(t)

 	alive := backend.EnableLivenessChannel()
 	assert.NotNil(t, alive)
 	assert.Equal(t, 1, len(alive))
 	assert.Equal(t, false, <-alive)
 	assert.NotNil(t, backend.liveness)
 }

 // Enabling Liveness Channel after First Liveness Check
 func TestEnableLivenessChannel_EmbeddedEtcdServer_AfterLivenessCheck(t *testing.T) {
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout*time.Second)
 	defer cancel()
 	backend.PerformLivenessCheck(ctx)

 	alive := backend.EnableLivenessChannel()
 	assert.NotNil(t, alive)
 	assert.Equal(t, 1, len(alive))
 	assert.Equal(t, true, <-alive)
 	assert.NotNil(t, backend.liveness)
 }

 // Update Liveness with alive status change
 func TestUpdateLiveness_AliveStatusChange(t *testing.T) {
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	// Enable Liveness Channel and verify initial state is not-alive
 	aliveState := backend.EnableLivenessChannel()
 	assert.NotNil(t, aliveState)
 	assert.Equal(t, 1, len(backend.liveness))
 	assert.Equal(t, false, <-backend.liveness)
 	lastUpdateTime := backend.lastLivenessTime

 	// Update with changed alive state. Verify alive state push & liveness time update
 	backend.updateLiveness(true)
 	assert.Equal(t, 1, len(backend.liveness))
 	assert.Equal(t, true, <-backend.liveness)
 	assert.NotEqual(t, lastUpdateTime, backend.lastLivenessTime)
 }

 // Update Liveness with same alive status reporting
 func TestUpdateLiveness_AliveStatusUnchanged(t *testing.T) {
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	// Enable Liveness Channel and verify initial state is not-alive
 	aliveState := backend.EnableLivenessChannel()
 	assert.NotNil(t, aliveState)
 	assert.Equal(t, false, <-backend.liveness)
 	lastUpdateTime := backend.lastLivenessTime

 	// Update with same alive state. Verify no further alive state push
 	backend.updateLiveness(false)
 	assert.Equal(t, 0, len(backend.liveness))
 	assert.Equal(t, lastUpdateTime, backend.lastLivenessTime)

 	// Now set lastUpdateTime 10 min back and push again
 	tenMinDuration, _ := time.ParseDuration("10m")
 	backend.lastLivenessTime = time.Now().Add(-tenMinDuration)
 	lastUpdateTime = backend.lastLivenessTime

 	backend.updateLiveness(false)
 	assert.Equal(t, 1, len(backend.liveness))
 	assert.Equal(t, false, <-backend.liveness)
 	assert.NotEqual(t, lastUpdateTime, backend.lastLivenessTime)
 }

 func TestIsErrorIndicatingAliveKvstore(t *testing.T) {
 	tests := []struct {
 		name string
 		arg  error
 		want bool
 	}{
 		{"No Error", nil, true},
 		{"Request Canceled", context.Canceled, true},
 		{"Request Timeout", context.DeadlineExceeded, false},
 		{"Etcd Error - InvalidArgument", status.New(codes.InvalidArgument, "").Err(), true},
 		{"Etcd Error - DeadlineExceeded", status.New(codes.DeadlineExceeded, "").Err(), false},
 		{"Etcd Error - Unavailable", status.New(codes.Unavailable, "").Err(), false},
 		{"Etcd Error - DataLoss", status.New(codes.DataLoss, "").Err(), false},
 		{"Etcd Error - NotFound", status.New(codes.NotFound, "").Err(), true},
 		{"Etcd Error - PermissionDenied ", status.New(codes.PermissionDenied, "").Err(), true},
 		{"Etcd Error - FailedPrecondition  ", status.New(codes.FailedPrecondition, "").Err(), true},
 	}

 	backend := provisionBackendWithEmbeddedEtcdServer(t)

 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			if backend.isErrorIndicatingAliveKvstore(tt.arg) != tt.want {
 				t.Errorf("isErrorIndicatingAliveKvstore failed for %s: expected %t but got %t", tt.name, tt.want, !tt.want)
 			}
 		})
 	}
 }

 func TestPut_EmbeddedEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	err := backend.Put(ctx, "key1", []uint8("value1"))
 	assert.Nil(t, err)

 	// Assert alive state has become true
 	assert.True(t, backend.alive)

 	// Assert that kvstore has this value stored
 	kvpair, err := backend.Get(ctx, "key1")
 	assert.Nil(t, err)
 	assert.NotNil(t, kvpair)
 	assert.Equal(t, defaultPathPrefix+"/key1", kvpair.Key)
 	assert.Equal(t, []uint8("value1"), kvpair.Value)

 	// Assert that Put overrides the Value
 	err = backend.Put(ctx, "key1", []uint8("value11"))
 	assert.Nil(t, err)
 	kvpair, err = backend.Get(ctx, "key1")
 	assert.Nil(t, err)
 	assert.NotNil(t, kvpair)
 	assert.Equal(t, defaultPathPrefix+"/key1", kvpair.Key)
 	assert.Equal(t, []uint8("value11"), kvpair.Value)
 }

 // Put operation should fail against Dummy Non-existent Etcd Server
 func TestPut_DummyEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithDummyEtcdServer(t)
 	err := backend.Put(ctx, "key1", []uint8("value1"))
 	assert.NotNil(t, err)

 	// Assert alive state is still false
 	assert.False(t, backend.alive)
 }

 // Test Get for existing and non-existing key
 func TestGet_EmbeddedEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	err := backend.Put(ctx, "key2", []uint8("value2"))
 	assert.Nil(t, err)

 	// Assert alive state has become true
 	assert.True(t, backend.alive)

 	// Assert that kvstore has this key stored
 	kvpair, err := backend.Get(ctx, "key2")
 	assert.NotNil(t, kvpair)
 	assert.Nil(t, err)
 	assert.Equal(t, defaultPathPrefix+"/key2", kvpair.Key)
 	assert.Equal(t, []uint8("value2"), kvpair.Value)

 	// Assert that Get works fine for absent key3
 	kvpair, err = backend.Get(ctx, "key3")
 	assert.Nil(t, err) // no error as lookup is successful
 	assert.Nil(t, kvpair)
 }

 // Get operation should fail against Dummy Non-existent Etcd Server
 func TestGet_DummyEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithDummyEtcdServer(t)
 	kvpair, err := backend.Get(ctx, "key2")
 	assert.NotNil(t, err)
 	assert.Nil(t, kvpair)

 	// Assert alive state is still false
 	assert.False(t, backend.alive)
 }

 // Test Delete for existing and non-existing key
 func TestDelete_EmbeddedEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	err := backend.Put(ctx, "key3", []uint8("value3"))
 	assert.Nil(t, err)

 	// Assert alive state has become true
 	assert.True(t, backend.alive)

 	// Assert that kvstore has this key stored
 	kvpair, err := backend.Get(ctx, "key3")
 	assert.Nil(t, err)
 	assert.NotNil(t, kvpair)

 	// Delete and Assert that key has been removed
 	err = backend.Delete(ctx, "key3")
 	assert.Nil(t, err)
 	kvpair, err = backend.Get(ctx, "key3")
 	assert.Nil(t, err)
 	assert.Nil(t, kvpair)

 	// Assert that Delete silently ignores absent key3
 	err = backend.Delete(ctx, "key3")
 	assert.Nil(t, err)
 }

 // Delete operation should fail against Dummy Non-existent Etcd Server
 func TestDelete_DummyEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithDummyEtcdServer(t)
 	err := backend.Delete(ctx, "key3")
 	assert.NotNil(t, err)

 	// Assert alive state is still false
 	assert.False(t, backend.alive)
 }

 // Test List for series of values under a key path
 func TestList_EmbeddedEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	key41 := "key4/subkey1"
 	key42 := "key4/subkey2"

 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	err := backend.Put(ctx, key41, []uint8("value4-1"))
 	assert.Nil(t, err)
 	err = backend.Put(ctx, key42, []uint8("value4-2"))
 	assert.Nil(t, err)

 	// Assert alive state has become true
 	assert.True(t, backend.alive)

 	// Assert that Get does not retrieve these Subkeys
 	kvpair, err := backend.Get(ctx, "key4")
 	assert.Nil(t, kvpair)
 	assert.Nil(t, err)

 	// Assert that List operation retrieves these Child Keys
 	kvmap, err := backend.List(ctx, "key4")
 	assert.NotNil(t, kvmap)
 	assert.Nil(t, err)
 	assert.Equal(t, 2, len(kvmap))
 	fullkey41 := defaultPathPrefix + "/" + key41
 	fullkey42 := defaultPathPrefix + "/" + key42
 	assert.Equal(t, fullkey41, kvmap[fullkey41].Key)
 	assert.Equal(t, []uint8("value4-1"), kvmap[fullkey41].Value)
 	assert.Equal(t, fullkey42, kvmap[fullkey42].Key)
 	assert.Equal(t, []uint8("value4-2"), kvmap[fullkey42].Value)
 }

 // List operation should fail against Dummy Non-existent Etcd Server
 func TestList_DummyEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithDummyEtcdServer(t)
 	kvmap, err := backend.List(ctx, "key4")
 	assert.Nil(t, kvmap)
 	assert.NotNil(t, err)

 	// Assert alive state is still false
 	assert.False(t, backend.alive)
 }

 // Test Create and Delete Watch for Embedded Etcd Server
 func TestCreateWatch_EmbeddedEtcdServer(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	backend := provisionBackendWithEmbeddedEtcdServer(t)
 	eventChan := backend.CreateWatch(ctx, "key5")
 	assert.NotNil(t, eventChan)
 	assert.Equal(t, 0, len(eventChan))

 	// Assert this method does not change alive state
 	assert.False(t, backend.alive)

 	// Put a value for watched key and event should appear
 	err := backend.Put(ctx, "key5", []uint8("value5"))
 	assert.Nil(t, err)
 	time.Sleep(time.Millisecond * 100)
 	assert.Equal(t, 1, len(eventChan))

 	backend.DeleteWatch("key5", eventChan)
 }
	/*
	* Copyright 2019-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 db

	import (
	"context"
	"os"
	"testing"
	"time"

	"github.com/opencord/voltha-lib-go/v3/pkg/mocks"
	"github.com/phayes/freeport"
	"github.com/stretchr/testify/assert"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	)

	const (
	embedEtcdServerHost = "localhost"
	defaultTimeout = 1
	defaultPathPrefix = "Prefix"
	)

	var (
	embedEtcdServerPort int
	dummyEtcdServerPort int
	)

	func TestMain(m *testing.M) {
	var err error
	embedEtcdServerPort, err = freeport.GetFreePort()
	if err != nil {
	logger.Fatal(err)
	}
	dummyEtcdServerPort, err = freeport.GetFreePort()
	if err != nil {
	logger.Fatal(err)
	}
	peerPort, err := freeport.GetFreePort()
	if err != nil {
	logger.Fatal(err)
	}
	etcdServer := mocks.StartEtcdServer(mocks.MKConfig("voltha.db.test", embedEtcdServerPort, peerPort, "voltha.lib.db", "error"))
	res := m.Run()

	etcdServer.Stop()
	os.Exit(res)
	}

	func provisionBackendWithEmbeddedEtcdServer(t testing.T) Backend {
	backend := NewBackend("etcd", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)
	assert.NotNil(t, backend)
	assert.NotNil(t, backend.Client)
	return backend
	}

	func provisionBackendWithDummyEtcdServer(t testing.T) Backend {
	backend := NewBackend("etcd", embedEtcdServerHost, dummyEtcdServerPort, defaultTimeout, defaultPathPrefix)
	assert.NotNil(t, backend)
	assert.NotNil(t, backend.Client)
	return backend
	}

	// Create instance using Etcd Kvstore
	func TestNewBackend_EtcdKvStore(t *testing.T) {
	backend := NewBackend("etcd", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)

	// Verify all attributes of backend have got set correctly
	assert.NotNil(t, backend)
	assert.NotNil(t, backend.Client)
	assert.Equal(t, backend.StoreType, "etcd")
	assert.Equal(t, backend.Host, embedEtcdServerHost)
	assert.Equal(t, backend.Port, embedEtcdServerPort)
	assert.Equal(t, backend.Timeout, defaultTimeout)
	assert.Equal(t, backend.PathPrefix, defaultPathPrefix)
	assert.Equal(t, backend.alive, false) // backend is not alive at start
	assert.Nil(t, backend.liveness) // no liveness channel is created at start
	assert.Equal(t, backend.LivenessChannelInterval, DefaultLivenessChannelInterval)
	}

	// Create instance using Consul Kvstore
	func TestNewBackend_ConsulKvStore(t *testing.T) {
	backend := NewBackend("consul", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)

	// Verify kvstore type attribute of backend has got set correctly
	assert.NotNil(t, backend)
	assert.NotNil(t, backend.Client)
	assert.Equal(t, backend.StoreType, "consul")
	}

	// Create instance using Invalid Kvstore; instance creation should fail
	func TestNewBackend_InvalidKvstore(t *testing.T) {
	backend := NewBackend("unknown", embedEtcdServerHost, embedEtcdServerPort, defaultTimeout, defaultPathPrefix)

	assert.NotNil(t, backend)
	assert.Nil(t, backend.Client)
	}

	func TestMakePath(t *testing.T) {
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	path := backend.makePath("Suffix")
	assert.Equal(t, defaultPathPrefix+"/Suffix", path)
	}

	// Liveness Check against Embedded Etcd Server should return alive state
	func TestPerformLivenessCheck_EmbeddedEtcdServer(t *testing.T) {
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout*time.Second)
	defer cancel()
	alive := backend.PerformLivenessCheck(ctx)
	assert.True(t, alive)
	}

	// Liveness Check against Dummy Etcd Server should return not-alive state
	func TestPerformLivenessCheck_DummyEtcdServer(t *testing.T) {
	backend := provisionBackendWithDummyEtcdServer(t)
	ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout*time.Second)
	defer cancel()
	alive := backend.PerformLivenessCheck(ctx)
	assert.False(t, alive)
	}

	// Enabling Liveness Channel before First Liveness Check
	func TestEnableLivenessChannel_EmbeddedEtcdServer_BeforeLivenessCheck(t *testing.T) {
	backend := provisionBackendWithEmbeddedEtcdServer(t)

	alive := backend.EnableLivenessChannel()
	assert.NotNil(t, alive)
	assert.Equal(t, 1, len(alive))
	assert.Equal(t, false, <-alive)
	assert.NotNil(t, backend.liveness)
	}

	// Enabling Liveness Channel after First Liveness Check
	func TestEnableLivenessChannel_EmbeddedEtcdServer_AfterLivenessCheck(t *testing.T) {
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout*time.Second)
	defer cancel()
	backend.PerformLivenessCheck(ctx)

	alive := backend.EnableLivenessChannel()
	assert.NotNil(t, alive)
	assert.Equal(t, 1, len(alive))
	assert.Equal(t, true, <-alive)
	assert.NotNil(t, backend.liveness)
	}

	// Update Liveness with alive status change
	func TestUpdateLiveness_AliveStatusChange(t *testing.T) {
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	// Enable Liveness Channel and verify initial state is not-alive
	aliveState := backend.EnableLivenessChannel()
	assert.NotNil(t, aliveState)
	assert.Equal(t, 1, len(backend.liveness))
	assert.Equal(t, false, <-backend.liveness)
	lastUpdateTime := backend.lastLivenessTime

	// Update with changed alive state. Verify alive state push & liveness time update
	backend.updateLiveness(true)
	assert.Equal(t, 1, len(backend.liveness))
	assert.Equal(t, true, <-backend.liveness)
	assert.NotEqual(t, lastUpdateTime, backend.lastLivenessTime)
	}

	// Update Liveness with same alive status reporting
	func TestUpdateLiveness_AliveStatusUnchanged(t *testing.T) {
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	// Enable Liveness Channel and verify initial state is not-alive
	aliveState := backend.EnableLivenessChannel()
	assert.NotNil(t, aliveState)
	assert.Equal(t, false, <-backend.liveness)
	lastUpdateTime := backend.lastLivenessTime

	// Update with same alive state. Verify no further alive state push
	backend.updateLiveness(false)
	assert.Equal(t, 0, len(backend.liveness))
	assert.Equal(t, lastUpdateTime, backend.lastLivenessTime)

	// Now set lastUpdateTime 10 min back and push again
	tenMinDuration, _ := time.ParseDuration("10m")
	backend.lastLivenessTime = time.Now().Add(-tenMinDuration)
	lastUpdateTime = backend.lastLivenessTime

	backend.updateLiveness(false)
	assert.Equal(t, 1, len(backend.liveness))
	assert.Equal(t, false, <-backend.liveness)
	assert.NotEqual(t, lastUpdateTime, backend.lastLivenessTime)
	}

	func TestIsErrorIndicatingAliveKvstore(t *testing.T) {
	tests := []struct {
	name string
	arg error
	want bool
	}{
	{"No Error", nil, true},
	{"Request Canceled", context.Canceled, true},
	{"Request Timeout", context.DeadlineExceeded, false},
	{"Etcd Error - InvalidArgument", status.New(codes.InvalidArgument, "").Err(), true},
	{"Etcd Error - DeadlineExceeded", status.New(codes.DeadlineExceeded, "").Err(), false},
	{"Etcd Error - Unavailable", status.New(codes.Unavailable, "").Err(), false},
	{"Etcd Error - DataLoss", status.New(codes.DataLoss, "").Err(), false},
	{"Etcd Error - NotFound", status.New(codes.NotFound, "").Err(), true},
	{"Etcd Error - PermissionDenied ", status.New(codes.PermissionDenied, "").Err(), true},
	{"Etcd Error - FailedPrecondition ", status.New(codes.FailedPrecondition, "").Err(), true},
	}

	backend := provisionBackendWithEmbeddedEtcdServer(t)

	for _, tt := range tests {
	t.Run(tt.name, func(t *testing.T) {
	if backend.isErrorIndicatingAliveKvstore(tt.arg) != tt.want {
	t.Errorf("isErrorIndicatingAliveKvstore failed for %s: expected %t but got %t", tt.name, tt.want, !tt.want)
	}
	})
	}
	}

	func TestPut_EmbeddedEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	err := backend.Put(ctx, "key1", []uint8("value1"))
	assert.Nil(t, err)

	// Assert alive state has become true
	assert.True(t, backend.alive)

	// Assert that kvstore has this value stored
	kvpair, err := backend.Get(ctx, "key1")
	assert.Nil(t, err)
	assert.NotNil(t, kvpair)
	assert.Equal(t, defaultPathPrefix+"/key1", kvpair.Key)
	assert.Equal(t, []uint8("value1"), kvpair.Value)

	// Assert that Put overrides the Value
	err = backend.Put(ctx, "key1", []uint8("value11"))
	assert.Nil(t, err)
	kvpair, err = backend.Get(ctx, "key1")
	assert.Nil(t, err)
	assert.NotNil(t, kvpair)
	assert.Equal(t, defaultPathPrefix+"/key1", kvpair.Key)
	assert.Equal(t, []uint8("value11"), kvpair.Value)
	}

	// Put operation should fail against Dummy Non-existent Etcd Server
	func TestPut_DummyEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithDummyEtcdServer(t)
	err := backend.Put(ctx, "key1", []uint8("value1"))
	assert.NotNil(t, err)

	// Assert alive state is still false
	assert.False(t, backend.alive)
	}

	// Test Get for existing and non-existing key
	func TestGet_EmbeddedEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	err := backend.Put(ctx, "key2", []uint8("value2"))
	assert.Nil(t, err)

	// Assert alive state has become true
	assert.True(t, backend.alive)

	// Assert that kvstore has this key stored
	kvpair, err := backend.Get(ctx, "key2")
	assert.NotNil(t, kvpair)
	assert.Nil(t, err)
	assert.Equal(t, defaultPathPrefix+"/key2", kvpair.Key)
	assert.Equal(t, []uint8("value2"), kvpair.Value)

	// Assert that Get works fine for absent key3
	kvpair, err = backend.Get(ctx, "key3")
	assert.Nil(t, err) // no error as lookup is successful
	assert.Nil(t, kvpair)
	}

	// Get operation should fail against Dummy Non-existent Etcd Server
	func TestGet_DummyEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithDummyEtcdServer(t)
	kvpair, err := backend.Get(ctx, "key2")
	assert.NotNil(t, err)
	assert.Nil(t, kvpair)

	// Assert alive state is still false
	assert.False(t, backend.alive)
	}

	// Test Delete for existing and non-existing key
	func TestDelete_EmbeddedEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	err := backend.Put(ctx, "key3", []uint8("value3"))
	assert.Nil(t, err)

	// Assert alive state has become true
	assert.True(t, backend.alive)

	// Assert that kvstore has this key stored
	kvpair, err := backend.Get(ctx, "key3")
	assert.Nil(t, err)
	assert.NotNil(t, kvpair)

	// Delete and Assert that key has been removed
	err = backend.Delete(ctx, "key3")
	assert.Nil(t, err)
	kvpair, err = backend.Get(ctx, "key3")
	assert.Nil(t, err)
	assert.Nil(t, kvpair)

	// Assert that Delete silently ignores absent key3
	err = backend.Delete(ctx, "key3")
	assert.Nil(t, err)
	}

	// Delete operation should fail against Dummy Non-existent Etcd Server
	func TestDelete_DummyEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithDummyEtcdServer(t)
	err := backend.Delete(ctx, "key3")
	assert.NotNil(t, err)

	// Assert alive state is still false
	assert.False(t, backend.alive)
	}

	// Test List for series of values under a key path
	func TestList_EmbeddedEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	key41 := "key4/subkey1"
	key42 := "key4/subkey2"

	backend := provisionBackendWithEmbeddedEtcdServer(t)
	err := backend.Put(ctx, key41, []uint8("value4-1"))
	assert.Nil(t, err)
	err = backend.Put(ctx, key42, []uint8("value4-2"))
	assert.Nil(t, err)

	// Assert alive state has become true
	assert.True(t, backend.alive)

	// Assert that Get does not retrieve these Subkeys
	kvpair, err := backend.Get(ctx, "key4")
	assert.Nil(t, kvpair)
	assert.Nil(t, err)

	// Assert that List operation retrieves these Child Keys
	kvmap, err := backend.List(ctx, "key4")
	assert.NotNil(t, kvmap)
	assert.Nil(t, err)
	assert.Equal(t, 2, len(kvmap))
	fullkey41 := defaultPathPrefix + "/" + key41
	fullkey42 := defaultPathPrefix + "/" + key42
	assert.Equal(t, fullkey41, kvmap[fullkey41].Key)
	assert.Equal(t, []uint8("value4-1"), kvmap[fullkey41].Value)
	assert.Equal(t, fullkey42, kvmap[fullkey42].Key)
	assert.Equal(t, []uint8("value4-2"), kvmap[fullkey42].Value)
	}

	// List operation should fail against Dummy Non-existent Etcd Server
	func TestList_DummyEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithDummyEtcdServer(t)
	kvmap, err := backend.List(ctx, "key4")
	assert.Nil(t, kvmap)
	assert.NotNil(t, err)

	// Assert alive state is still false
	assert.False(t, backend.alive)
	}

	// Test Create and Delete Watch for Embedded Etcd Server
	func TestCreateWatch_EmbeddedEtcdServer(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	backend := provisionBackendWithEmbeddedEtcdServer(t)
	eventChan := backend.CreateWatch(ctx, "key5")
	assert.NotNil(t, eventChan)
	assert.Equal(t, 0, len(eventChan))

	// Assert this method does not change alive state
	assert.False(t, backend.alive)

	// Put a value for watched key and event should appear
	err := backend.Put(ctx, "key5", []uint8("value5"))
	assert.Nil(t, err)
	time.Sleep(time.Millisecond * 100)
	assert.Equal(t, 1, len(eventChan))

	backend.DeleteWatch("key5", eventChan)
	}