address lavalamp's comment on using testapi instead of latest, and adding comments for public method.

pkg/api/install/install_test.go

@@ -46,6 +46,8 @@ func TestResourceVersioner(t *testing.T) {
 
 func TestCodec(t *testing.T) {
 	pod := internal.Pod{}
+	// We do want to use package latest rather than testapi here, because we
+	// want to test if the package install and package latest work as expected.
 	data, err := latest.GroupOrDie("").Codec.Encode(&pod)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)

pkg/api/registered/registered.go

@@ -67,6 +67,8 @@ func IsRegisteredAPIVersion(version string) bool {
 	return false
 }
 
+// GroupVersionsForGroup returns the registered versions of a group in the form
+// of "group/version".
 func GroupVersionsForGroup(group string) []string {
 	ret := []string{}
 	for _, v := range RegisteredVersions {

pkg/apis/experimental/install/install_test.go

@@ -47,6 +47,8 @@ func TestResourceVersioner(t *testing.T) {
 
 func TestCodec(t *testing.T) {
 	daemonSet := experimental.DaemonSet{}
+	// We do want to use package latest rather than testapi here, because we
+	// want to test if the package install and package latest work as expected.
 	data, err := latest.GroupOrDie("experimental").Codec.Encode(&daemonSet)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)

plugin/pkg/scheduler/factory/factory_test.go

@@ -24,7 +24,6 @@ import (
 	"time"
 
 	"k8s.io/kubernetes/pkg/api"
-	"k8s.io/kubernetes/pkg/api/latest"
 	"k8s.io/kubernetes/pkg/api/testapi"
 	"k8s.io/kubernetes/pkg/client/cache"
 	client "k8s.io/kubernetes/pkg/client/unversioned"
@@ -143,7 +142,7 @@ func TestDefaultErrorFunc(t *testing.T) {
 	}
 	handler := util.FakeHandler{
 		StatusCode:   200,
-		ResponseBody: runtime.EncodeOrDie(latest.GroupOrDie("").Codec, testPod),
+		ResponseBody: runtime.EncodeOrDie(testapi.Default.Codec(), testPod),
 		T:            t,
 	}
 	mux := http.NewServeMux()