Update mockkubeapiserver/postresource.go

Co-authored-by: Tomas Aschan <1550920+tomasaschan@users.noreply.github.com>

mockkubeapiserver/postresource.go

@@ -105,7 +105,7 @@ func preCreateHook(ctx context.Context, obj *unstructured.Unstructured) error {
 			for k, vAny := range stringDataMap {
 				v, ok := vAny.(string)
 				if !ok {
-					return fmt.Errorf("unexpected type for v1.Secret stringData entry, got %T", vAny)
+					return fmt.Errorf("unexpected type for v1.Secret stringData entry %s: expected string, got %T", k, vAny)
 				}
 				dataMap[k] = base64.StdEncoding.EncodeToString([]byte(v))
 			}