update test code

Author: hugehoo

xds/internal/resolver/helpers_test.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
+
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/grpctest"
@@ -114,7 +115,6 @@ func buildResolverForTarget(t *testing.T, target resolver.Target, bootstrapConte
 		select {
 		case stateCh <- s:
 		default:
-			// If channel is full, drop the oldest update to prevent blocking
 			select {
 			case <-stateCh:
 				stateCh <- s
@@ -128,7 +128,6 @@ func buildResolverForTarget(t *testing.T, target resolver.Target, bootstrapConte
 		select {
 		case errCh <- err:
 		default:
-			// If channel is full, drop the oldest error to prevent blocking
 			select {
 			case <-errCh:
 				errCh <- err
@@ -144,7 +143,6 @@ func buildResolverForTarget(t *testing.T, target resolver.Target, bootstrapConte
 		t.Fatalf("Failed to build xDS resolver for target %q: %v", target, err)
 	}
 	t.Cleanup(func() {
-		// Drain channels before closing to prevent blocking
 		go func() {
 			for range stateCh {
 			}