diff --git a/server.js b/server.js
index fe6863b..1857cda 100644
--- a/server.js
+++ b/server.js
@@ -8,7 +8,8 @@ import icalGenerator from 'ical-generator';
 const app = express();
 app.use(express.json());
 
-const MERGED_CALENDARS_DIR = 'calendar';
+const MERGED_CALENDARS_DIR = process.env.TEST_MERGED_CALENDARS_DIR || 'calendar';
+
 
 // Ensure the merged calendars directory exists
 if (!fs.existsSync(MERGED_CALENDARS_DIR)) {