test: reutilizar DB en memoria entre bloques de ResponseQueue

Co-authored-by: aider (openrouter/openai/gpt-5) <aider@aider.chat>

tests/unit/services/response-queue.test.ts

@@ -19,8 +19,7 @@ describe('ResponseQueue (persistent add)', () => {
 
   afterAll(() => {
     process.env = envBackup;
-    (ResponseQueue as any).dbInstance = originalDbInstance;
-    testDb.close();
+    // No cerramos ni restablecemos la DB aquí; se hará al final del bloque de reintentos.
   });
 
   beforeEach(() => {
@@ -108,15 +107,9 @@ describe('ResponseQueue (persistent add)', () => {
 });
 
 describe('ResponseQueue (retries/backoff)', () => {
-  beforeAll(() => {
-    // Re-crear DB en memoria y reinyectar para este bloque
-    testDb = new Database(':memory:');
-    initializeDatabase(testDb);
-    originalDbInstance = (ResponseQueue as any).dbInstance;
-    (ResponseQueue as any).dbInstance = testDb;
-  });
-
+  // Reutiliza la misma DB inyectada en el bloque anterior
   afterAll(() => {
+    // Restaurar DB original y cerrar la de prueba al finalizar todos los tests de reintentos
     (ResponseQueue as any).dbInstance = originalDbInstance;
     testDb.close();
   });