diff --git a/internal/api/files_test.go b/internal/api/files_test.go
index 1018911..395745b 100644
--- a/internal/api/files_test.go
+++ b/internal/api/files_test.go
@@ -187,6 +187,11 @@ func TestFilesAPI(t *testing.T) {
 	if mvd["folder"] != subID || mvd["note"] != note["id"].(string) || mvd["name"] != "guia-v2.md" {
 		t.Errorf("move result: %+v", mvd)
 	}
+	// arrastar-e-soltar depende do id estável: a referência na nota aponta
+	// para /api/files/static/{id} e não pode quebrar ao mover de pasta.
+	if mvd["id"] != mdID {
+		t.Errorf("move deveria preservar o id do arquivo: %+v", mvd)
+	}
 
 	// nota fantasma na associação → 400
 	bad := auth(t, srv, "PUT", "/api/files/"+mdID+"/move", `{"note":"naoexiste1"}`)
@@ -195,6 +200,13 @@ func TestFilesAPI(t *testing.T) {
 	}
 	bad.Body.Close()
 
+	// pasta fantasma no move → 400
+	badFolder := auth(t, srv, "PUT", "/api/files/"+mdID+"/move", `{"folder":"naoexiste1"}`)
+	if badFolder.StatusCode != http.StatusBadRequest {
+		t.Errorf("pasta fantasma no move: %s", badFolder.Status)
+	}
+	badFolder.Body.Close()
+
 	// excluir pasta raiz remove subtree e arquivos (png + md movido)
 	del := auth(t, srv, "DELETE", "/api/folders/"+fid, "")
 	if del.StatusCode != http.StatusNoContent {