restore test that somehow vanished + add SetList

pkg/runtime/scheme.go

@@ -400,28 +400,3 @@ func (metaInsertion) Interpret(in interface{}) (version, kind string) {
 	m := in.(*metaInsertion)
 	return m.JSONBase.APIVersion, m.JSONBase.Kind
 }
-
-// Extract list returns obj's Items element as an array of runtime.Objects.
-// Returns an error if obj is not a List type (does not have an Items member).
-func ExtractList(obj Object) ([]Object, error) {
-	v := reflect.ValueOf(obj)
-	if !v.IsValid() {
-		return nil, fmt.Errorf("nil object")
-	}
-	items := v.Elem().FieldByName("Items")
-	if !items.IsValid() {
-		return nil, fmt.Errorf("no Items field")
-	}
-	if items.Kind() != reflect.Slice {
-		return nil, fmt.Errorf("Items field is not a slice")
-	}
-	list := make([]Object, items.Len())
-	for i := range list {
-		item, ok := items.Index(i).Addr().Interface().(Object)
-		if !ok {
-			return nil, fmt.Errorf("item in index %v isn't an object", i)
-		}
-		list[i] = item
-	}
-	return list, nil
-}