Add unit tests

vendor/google.golang.org/grpc/balancer.go

@@ -19,10 +19,10 @@
 package grpc
 
 import (
+	"context"
 	"net"
 	"sync"
 
-	"golang.org/x/net/context"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/grpclog"
@@ -43,7 +43,7 @@ type Address struct {
 
 // BalancerConfig specifies the configurations for Balancer.
 //
-// Deprecated: please use package balancer.
+// Deprecated: please use package balancer.  May be removed in a future 1.x release.
 type BalancerConfig struct {
 	// DialCreds is the transport credential the Balancer implementation can
 	// use to dial to a remote load balancer server. The Balancer implementations
@@ -57,7 +57,7 @@ type BalancerConfig struct {
 
 // BalancerGetOptions configures a Get call.
 //
-// Deprecated: please use package balancer.
+// Deprecated: please use package balancer.  May be removed in a future 1.x release.
 type BalancerGetOptions struct {
 	// BlockingWait specifies whether Get should block when there is no
 	// connected address.
@@ -66,7 +66,7 @@ type BalancerGetOptions struct {
 
 // Balancer chooses network addresses for RPCs.
 //
-// Deprecated: please use package balancer.
+// Deprecated: please use package balancer.  May be removed in a future 1.x release.
 type Balancer interface {
 	// Start does the initialization work to bootstrap a Balancer. For example,
 	// this function may start the name resolution and watch the updates. It will
@@ -120,7 +120,7 @@ type Balancer interface {
 // RoundRobin returns a Balancer that selects addresses round-robin. It uses r to watch
 // the name resolution updates and updates the addresses available correspondingly.
 //
-// Deprecated: please use package balancer/roundrobin.
+// Deprecated: please use package balancer/roundrobin. May be removed in a future 1.x release.
 func RoundRobin(r naming.Resolver) Balancer {
 	return &roundRobin{r: r}
 }