se agrego el modo pruebas

src/main.ts

@@ -4,8 +4,14 @@ import { ValidationPipe } from '@nestjs/common';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
+  let origen
+  if (process.env.MODO === 'pruebas') {
+    origen = '*'
+  } else {
+    origen = [process.env.CORS_ORIGINS]
+  }
   app.enableCors({
-    origin: [process.env.CORS_ORIGINS],
+    origin: origen,
     methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
     credentials: true,
   });