Applied comments from the review

pkg/api/serialization_test.go

@@ -180,7 +180,7 @@ func doRoundTripTest(group testapi.TestGroup, kind string, t *testing.T) {
 	if api.Scheme.Recognizes(group.GroupVersion().WithKind(kind)) {
 		roundTripSame(t, group, item, nonRoundTrippableTypesByVersion[kind]...)
 	}
-	if !nonInternalRoundTrippableTypes.Has(kind) {
+	if !nonInternalRoundTrippableTypes.Has(kind) && api.Scheme.Recognizes(group.GroupVersion().WithKind(kind)) {
 		roundTrip(t, group.Codec(), fuzzInternalObject(t, group.InternalGroupVersion(), item, rand.Int63()))
 	}
 }

pkg/api/testapi/testapi.go

@@ -75,7 +75,7 @@ func init() {
 	if _, ok := Groups[autoscaling.GroupName]; !ok {
 		Groups[autoscaling.GroupName] = TestGroup{
 			externalGroupVersion: unversioned.GroupVersion{Group: autoscaling.GroupName, Version: registered.GroupOrDie(autoscaling.GroupName).GroupVersion.Version},
-			internalGroupVersion: autoscaling.SchemeGroupVersion,
+			internalGroupVersion: extensions.SchemeGroupVersion,
 		}
 	}
 	if _, ok := Groups[extensions.GroupName]; !ok {

pkg/runtime/serializer/versioning/versioning.go

@@ -168,7 +168,6 @@ func (c *codec) Decode(data []byte, defaultGVK *unversioned.GroupVersionKind, in
 		targetGV.Group = group
 		targetGV.Version = runtime.APIVersionInternal
 	} else {
-		fmt.Printf("looking for %v in %#v\n", group, c.decodeVersion)
 		gv, ok := c.decodeVersion[group]
 		if !ok {
 			// unknown objects are left in their original version